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Research Article
Revised

Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial

[version 3; peer review: 3 approved]
PUBLISHED 21 Dec 2020
Author details Author details
OPEN PEER REVIEW
REVIEWER STATUS

Abstract

Background: Nutritional support plays an essential role for recovery in infants who undergo gastrointestinal surgery. The current standard type of intravenous lipid emulsion (IVLE) used as parenteral nutrition is the mixture of medium-chain triglyceride (MCT) and long chain triglyceride (LCT) rich in ω-6. Studies showed that ω-6 is associated with higher level of proinflammatory cytokines, leading to increased mortality rate, morbidity rate, and postoperative recovery time. The latest generation of emulsion is a mixture of MCT, LCT, olive oil (OO), and fish oil (FO) which may optimize the ω6/ω3 ratio. This study aimed to compare the effect of MCT/LCT/OO/FO IVLE to standard IVLE on IL-1β, IL-8 and serum fatty acids in infants who had undergone gastrointestinal surgery.
Methods: A single-blind, randomised controlled, pretest-posttest design study was done in twelve subjects that were classified into two groups. Group 1 received standard IVLE, group 2 received MCT/LCT/OO/FO IVLE. The type of standard and MCT/LCT/OO/FO IVLE used in this study were Lipofundin 20% and SMOFlipid 20%, respectively, both administered for three consecutive days in 1-4 gram/kilogram/day. IL-1β and IL-8 were examined using ELISA while fatty acids was analyzed using gas chromatography tandem mass spectrometry (GC-MS). Statistical analyses were performed using SPSS for Mac 23.
Results: No statistical difference was found in age, gender, birth weight and diagnosis between both groups. Leukocyte was significantly lower in MCT/LCT/OO/FO group 3 days after surgery (p=0.025). CRP was lower in MCT/LCT/OO/FO group 3 days after surgery (p=0.01) and in changes within 3 days (p=0.016). There were no differences in IL-1β, IL-8 and ω-3 but ω-6 was higher in standard IVFE group on third day after surgery (p=0,048)
Conclusion: MCT/LCT/OO/FO IVLE can significantly lower leukocyte, CRP and ω-6 levels and is comparable with standard IVLE on IL-1β, IL-8 and ω-3 levels in infants who had undergone gastrointestinal surgery.

Keywords

Parenteral Nutrition, Intravenous Lipid Emulsion, Interleukin-1Beta, Interleukin-8, Omega-3

Revised Amendments from Version 2

- Dataset revised. 
- Link for reporting guidelines changed.

See the authors' detailed response to the review by Philip Calder
See the authors' detailed response to the review by Peter Stehle

Introduction

Surgical interventions may stimulate physiological inflammatory response as body’s attempt towards general recovery1. The balance of inflammatory response brings about good recovery, while excessive level of proinflammatory cytokines such as interleukin (IL) )-1β, IL-6, IL-8, and tumor necrosis factor (TNF)-α, may cause organ damage and severe complications, leading to the rise of postoperative mortality and morbidity rate2. De Mooij stated that IL-1β plays an important role in infection control, homeostasis, and tissue repair, while IL-8 plays an important role in inflammation and wound healing35.

Nutritional support is essential in wound healing and plays an important role in growth and development of an infant after undergoing gastrointestinal surgery6. Patients who could not receive oral and enteral nutrition for two days should be considered for parenteral nutrition7,8. The current standard type of fat emulsion used as parenteral nutrition is a mixture of medium-chain triglyceride (MCT) and soy oil enriched with long-chain triglyceride (LCT)9. This emulsion is rich in ω-6 fatty acids and contains linoleic acid (LA, C18:2 ω -6) and also α-linolenic acid (ALA, C18:3 ω-3). Several studies showed that ω-6 fatty acids are associated with impaired cell-mediated immunity and higher potential risk of elevated proinflammatory biomarkers and severe inflammatory response. These mechanisms may bring about the rise in mortality rate, morbidity rate and may also prolong the duration of treatment and postoperative recovery time1012.

The latest generation of fat emulsion, SMOFlipid, is a mixture of MCT, LCT, olive oil (OO), and fish oil (FO), optimizing the ω6/ ω3 ratio. Some studies showed that OO exerts indirect anti-inflammatory effect by replacing ω-6 fatty acids with oleic acid, while the addition of ω-3 fatty acids from FO in soy-oil based fat emulsion may inhibit inflammatory reactions, i.e. reducing cytokine secretion and adhesion molecule expression and balancing the immune system, since it contains eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA)6,1316. ω-3 fatty acids may also act as a regulator of the immune system and mitigator of inflammation since it acts as a precursor for lipid mediator16. Our previous study showed lower levels of proinflammatory cytokines IL-6 and TNF-α in subjects who received the mixture of MCT/LCT/OO/FO compared with subjects who received MCT/LCT IVLE17. To our knowledge, there been no study regarding the effects of MCT/LCT/OO/FO IVLE on IL-1β and IL-8 levels and fatty acid composition in infants who undergo gastrointestinal surgery, compared to those who receive standard IVLE.

Methods

Study background and recruitment

This single-blind, randomized controlled, pretest-posttest design, parallel-group with 1:1 randomization study aimed to compare the effect of MCT/LCT/OO/FO IVLE to standard MCT/LCT IVLE on IL-1β, IL-8 levels and fatty acid composition in infants who had undergone gastrointestinal surgery. The primary outcomes of this study were IL-1β and IL-8 levels and fatty acid composition while the secondary outcomes were hemoglobin, leukocyte, C-reactive protein (CRP) and albumin levels. This study was conducted in April–July 2020. Our subjects were infants who had undergone gastrointestinal surgery at Soetomo General Hospital, Surabaya. Parents or legal guardian were recruited to the study through referrals from physicians who then contacted the research team. The number of subjects was determined based on the formula for calculating number of samples in non-comparative numerical analytical study, with type 1 error of 5% and type 2 error of 10%, and the minimum number samples for each group were 5 subjects18. The effect size that was used in this formula was 20 pg/ml, with standard deviation of 10.6 pg/ml. This effect size and standard deviation were used to measure our primary outcome (Interleukin-1β). Inclusion criteria for this study included subjects whose parents were willing for them to participate in this study, had undergone gastrointestinal surgery, and had received parenteral nutrition for at least 3 days. Exclusion criteria included subjects who had chronic diseases and subjects who were allergic to fish, egg, soy and/or nut proteins. Adverse effects were minimal or rare. However, if any harm was seen in the subjects, they would be recorded and reported at the end of the trial. Vital signs and allergic reaction signs were evaluated every 12 hours for all subjects.

Ethical considerations

This study was approved by the Ethical Committee of Dr. Soetomo General Hospital (No. 1922/KEPK/11/2020, March 27th 2020). Written informed consent obtained from the subjects’ parents or legal guardian.

Participant allocation and blinding

Subjects were randomly assigned to one of two IVLE groups following simple randomization procedures (computerized random numbers, https://www.random.org). Determination of whether a subject would get MCT/LCT standard IVLE or MCT/LCT/OO/FO was made by reference to a statistical series based on random sampling numbers drawn up by the primary investigator. Except the primary investigator and the pharmacist in charge, all subjects and staff were kept blind to IVLE assignment of the subjects. Twelve-folded numbered papers were placed into opaque sealed envelopes to be chosen by the subjects’ parents or legal guardian. Investigators and pharmacy staff opened the envelope and used the lipid emulsion assigned to that patient. The trial is registered at ClinicalTrials.gov, number NCT04511299, registered on August 13th 2020. The protocol of this study can be seen at https://doi.org/10.17504/protocols.io.bknmkvc6. The flow of this research is shown on Figure 1.

a1f4c2b1-5001-4974-b0f7-f7e9240d7968_figure1.gif

Figure 1. Study flowchart.

Interventions and measurement

The type of MCT/LCT IVLE used in this study was Lipofundin 20% which contained 50% coconut oil as the source of MCT and 50% soy oil as the source of LCT. Lipofundin 20% was given intravenously for three consecutive days after gastrointestinal surgery at 1–4 gram/kilogram/day dosing8. The type of MCT/LCT/OO/FO IVLE used in this study was Smoflipid 20%, which contained 30% soy oil as the source of LCT, 30% coconut oil as the source of MCT, 25% olive oil, and 15% fish oil. SMOFlipid® was given for three consecutive days in 1–4 gram/kilogram/day dosing8. The lipids used in this study were obtained from the manufacturers: Bbraun Indonesia (Lipofundin 20% I and Fresenius Kabi Indonesia (Smoflipid 20%). The comparison of the standard fat emulsion and ω-3-enriched fat emulsion is shown on Table 1. Both groups received isonitrogenous and isocaloric parenteral nutrition.

Table 1. Comparison of intravenous lipid emulsion content.

Oil sourceLipofundin 20%
MCT/LCT
SMOF lipid
20%
Soybean oil, refined106.0
Triglycerides, medium-chain106.0
Olive oil, refined05.0
Fish oil03.0
Fat composition (g)
Linoleic acid2.72.9
Alpha-linolenic acid0.40.3
Eicosapentaenoic acid00.3
Docosahexaenoic acid00.05
Oleic acid1.12.8
Palmitic acid0.70.9
Stearic acid0.20.3
Arachidonic acid0.020.05

Before surgery, blood samples of subjects were drawn (3–4 cm3) in order to measure their IL-1β, IL-8 levels, fatty acid composition, also hemoglobin, leukocyte, CRP and albumin levels. After surgery, subjects were assigned to either MCT/LCT IVLE or MCT/LCT/OO/FO IVLE for three consecutive days. On 3rd day (72 hours) after surgery, blood samples of subjects were drawn again in order to measure the same outcomes post-treatment. The blood samples were harvested after stopping infusion for 6 hours. Once the samples arrive to the laboratory, samples are allowed to clot for 30 minutes at room temperature before centrifugation for 15 minutes at 1000 x g. L-1β and IL-8 levels in the serum were examined using the Quantikine HS ELISA by R&D Systems (Catalog Number HSLB00D and HS800) at wavelengths of 540 nm and 650 nm, respectively. Fatty acid composition was analyzed using gas chromatography tandem mass spectrometry (GC-MS). This examination was measuring the levels of fatty acid in human serum quantitatively, including the arachidonic acid (AA)/EPA ratio, EPA, DHA, and AA. This method consists of two techniques, namely gas chromatography, which is a separation technique based on the degree of polarity and vapor point and mass spectrophotometry, which is a quadupole scanning spectrometer that can measure masses of 7-250 atomic mass units. Reagents used in this study were FAME Standard Mix (Supelco), GLC Nonadecanoic ISTD (Supelco), N-Hexane MS grade (Merck), Chloroform (Merck), Methanol Hyper Grade (Merck), Capillary Column and Helium Gas for GCMS. For this examination, once the samples arrive to the laboratory, samples are allowed to clot for 30 minutes at room temperature before centrifugation for 15 minutes at 1000 x g. After that, we made diluent by put 290 microliter of chloroform and 10 uL ISTD with concentration of 2.5 mg/ml to a serum cup. Add 100 microliter sample and 150 microliter methanol and let it homogenized with vortex for about 2 minutes. We added 300 microliter diluent sample and homogenized it for 2 minutes before centrifugation for 5 minutes at 2500 x g. After centrifugation, there were 3 layers. We took the bottom layer (chloroform containing analytes), dry the supernatant with nitrogen gradually, first 10 minutes at 5 Psi, and the next 30 minutes at 10 Psi. We redissolved it with 190 microliter n-Hexan and added 10 microliter of derivatization substances. After the serum cup were parafilmed and incubated for 2 hours, there were 2 layers. We took 100 microliter of top layer, added 400 microliter of n-Hexan to the GC vial amber, and injected it to the GCMS system.

Statistical analysis

Statistical analyses performed in this study were Mann-Whitney U-test, Fishers’ Exact test, independent sample t-test and chi-square test using SPSS for Mac 23.0. The analyses of the IL-1β, IL-8 levels, fatty acid composition, also hemoglobin, leukocyte, CRP and albumin levels were done by Mann-Whitney U-test or independent sample T-test as appropriate to test the significance between the two groups. A p-value less than or equal to 0.05 was considered statistically significant. The analysis of subjects’ characteristic were done by Mann-Whitney U-test, independent sample T-test, Fisher’s exact test or chi-square test as appropriate to test the significance between the two groups. All parameters examined were compared for differences before surgery, 3 days after surgery and differences within those 3 days (delta).

Results

Subject characteristics

This study enrolled 12 subjects at Soetomo General Hospital Surabaya who had undergone gastrointestinal surgery and met the inclusion and exclusion criteria. The recruitment flow of the subjects is shown on Figure 2. The subjects were classified into two groups: group 1 received intravenous MCT/LCT lipid emulsion, and group 2 received intravenous MCT/LCT/OO/FO lipid emulsion. Subject characteristics are shown in Table 2.

a1f4c2b1-5001-4974-b0f7-f7e9240d7968_figure2.gif

Figure 2. Study flow diagram.

Table 2. Subject characteristics.

CharacteristicMCT/LCTMCT/LCT/OO/FOp-value
Age (days, median±IQR)6.50±10.75.00±12.70.872*
Gender
    Male
    Female

3 (25%)
3 (25%)

5 (41.6%)
1 (8.4%)
0.545**
Birth weight (g, mean±SD)2708.33±697.42681.67±497.20.941***
Diagnosis
    Anorectal malformation
    Pancreas annulare
    Oesophageal atresia
    Atresia duodenum

2 (16.6%)
1 (8.4%)
2 (16.6%)
1 (8.4%)

2 (16.6%)
3 (25%)
1 (8.4%)
0
0.506****

*Mann-Whitney test ** Fishers’ Exact test *** Independent Sample Test ****Chi-square test

No statistical difference was found in age, gender, birth weight, and diagnosis between both groups. De-identified subject characteristics, alongside all parameters measured in this study, are available as Underlying data19.

Primary outcomes

Mean IL-1β levels among subjects are depicted in Table 3; no difference was found in IL-1β levels between both groups before surgery (p = 0.873) and on day three after surgery (p = 0.873). We also did not find any difference in changes in IL-1β levels within 3 days (p = 0.906) in both groups.

Table 3. Cytokine levels in subjects.

CytokineMCT/LCT
n=6
MCT/LCT/OO/FO
n=6
P
Before
surgery
Day-3 post
surgery
Changes
within 3 days
Before
surgery
Day-3 post
surgery
Changes
within 3 days
L-1β
(pg/ml, mean±SD)
3.65±5.33.84±4.60.19±5.61.93±1.62.42±1.50.49±1.90.873*a
0.873*b
0.906**c
IL-8
(pg/ml, mean±SD)
157.50±103.1151.31±113.5-6.20±171.5130.01±109.4144.46±110.514.4±166.50.688*a
0.496**b
0.837**c

*Independent sample t-test. **Mann-Whitney U-test. a Difference between groups before surgery. b Difference between groups 3 days post-surgery. c Difference between groups on changes within 3 days.

Furthermore, there was no significant difference in mean IL-8 levels between both groups before surgery (p = 0.688) and on day three after surgery (p = 0.494), and no difference in IL-8 levels changes within 3 days (p = 0.837) in both groups.

The analysis of fatty acid composition is shown on Table 4. No significant differences were observed in ω6/ω3 ratio, AA/EPA ratio, and EPA, DHA, and AA levels between both groups. Nevertheless, ω-6 fatty acids level was significantly lower in MCT/LCT/FO/OO IVLE group on third day after surgery group (p=0,048) compared to the standard IVLE.

Table 4. Serum fatty acid between standard and omega-3 enriched intravenous lipid emulsion.

Fatty
acid
(%total
fatty
acids, umol/L)
MCT/LCT
N=6
ω-3 IVLE
N=6
p-value
Before surgery
(Mean±SD)
Day-3 post
surgery
(Mean±SD)
Changes
within 3 days
(Mean±SD)
Before surgery
(Mean±SD)
Day 3 post
surgery
(Mean±SD)
Changes
within 3 days
(Mean±SD)
Ratio
ω6/ω3
4.91±1.17.21±1.22.30±1.26.1±1.86.68±2.40.73±2.40.206*
0.172**
0.177*
AA/EPA16.50±14.510.50±6.2-6.00±15.183.83±100.315.67±16.9-68.17±87.70.229**
0.936**
0.145*
ω 36.83±1.75.83±0.8-1.00±1.45.51±1.75.83±1.50.33±1.00.214*
0.739**
0.092*
ALA0.59±0.51.14±0.30.54±0.30.39±0.450.69±0.430.29±0.60.479*
0.07**
0.415*
EPA0.99±0.63.42±1.4-0.06±0.80.59±0.73.51±1.20.49±0.70.150**
0.914*
0.212*
DHA5.35±1.63.86±0.6-1.49±1.24.58±1.53.91±0.8-0.67±1.30.412*
0.907*
0.270*
LA20.29±10.332.77±2.812.47±7.919.45±8.826.65±6.27.20±10.60.882*
0.053*
0.352*
GLA0.14±0.10.31±0.11.64±0.30.18±0.10.21±0.21.18±0.60.202*
0.255*
0.144*
DGLA1.62±0.91.64±0.3-0.23±0.61.71±0.71.18±0.6-0.09±1.20.857*
0.132*
0.144*
AA9.56±2.87.55±1.7-1.68±1.910.71±4.37.69±2.5-3.01±5.30.596*
0.907*
0.583*
ω-633.14±6.442.61±3.28.48±6.332.08±5.636.04±6.43.96±7.40.765*
0.048*
0.282*
OA18.33±3.215.15±1.5-3.18±2.917.71±5.217.38±3.9-0.34±5.10.810*
0.242*
0.259*
MA0.67±0.160.62±0.1-0.06±0.10.79±0.30.74±0.3-0.06±0.40.432*
0.450*
0.979*
PA28.67±5.125.02±1.4-3.65±4.630.75±5.428.30±3.8-2.45±6.10.511*
0.075*
0.708*
SA8.05±1.18.42±1.00.37±0.98.61±2.2138.14±316.90.01±3.50.586*
0.631**
0.809*
Saturated37.42±5.434.07±1.0-3.36±4.740.16±6.637.66±3.5-2.50±7.60.453*
0.053*
0.819*
MUFA22.46±3.917.67±1.6-4.79±2.9522.18±5.320.56±5.4-1.62±6.30.919*
0.255*
0.378**
PUFA40.11±7.448.23±2.38.12±5.9837.65±7.141.76±6.94.11±7.90.571*
0.071*
0.345*
Total 6509.50±1361.66309.34±1383.07-200.17±1987.95175.34±3613.26414.17±1838.21238.84±3925.20.417*
0.913*
0.448*

*Independent Sample Test **Mann-Whitney Test AA: arachidonic acid, EPA: eicosapentaenoic acid, ALA: alpha-linolenic acid, DHA: docosapentaenoic Acid, LA: linoleic acid, GLA: gamma-linolenic acid, DGLA: dihomo-gamma-linolenic-acid, OA: oleic acid, MA: myristic acid, PA: palmitic acid, SA: stearic acid, MUFA: monounsaturated fatty acids, PUFA: polyunsaturated fatty acids.

Secondary outcomes

The laboratory parameters are shown in Table 5. According to preoperative laboratory assessment, no statistical difference was found in hemoglobin, leukocyte, CRP and albumin levels between both groups. There was a statistically significant difference in leukocytes between both groups 3 days after surgery (p=0.025). CRP level was significantly lower in MCT/LCT/OO/FO group 3 days after surgery (p=0.01) and in changes within 3 days (p=0.016) compared to the standard MCT/LCT IVLE.

Table 5. Laboratory parameters in subjects.

VariableMCT/LCT
n=6
MCT/LCT/OO/FO
n=6
P-value
Before surgeryDay 3 Post
surgery
Changes within
3 days
Before surgeryDay 3 Post
surgery
Changes
within 3 days
Hemoglobin
(g/dL)
15.65±2.212.78±1.8-2.90±2.315.31±2.813.02±3.2-2.30±1.60.826*
0.879*b
0.612*c
Leukocytes
(/mm3)
17523.33±8362.713521.67±5121.5-4001.67±8487.112788.67±5144.57653.33±1937.1-511.34±6006.60.263*a
0.025*b
0.799*c
CRP
(mg/dL)
0.28±0.34.23±7.13.95±7.22.61±2.50.38±0.4-2.23±2.650.097**a
0.010**b
0.016**c
Albumin
(g/dL)
3.20±0.43.12±0.5-0.08±0.73.18±0.33.30±0.40.12±0.20,629**a
0.493**b
0.495**c

*Independent Sample Test **Mann-Whitney Test aDifferences between the MCT/LCT group and MCT/LCT/OO/FO before surgery b Differences between the MCT/LCT group and MCT/LCT/OO/FO 3 days post surgery c Differences between the MCT/LCT group and MCT/LCT/OO/FO in changes within 3 days

Adverse effects

There were no adverse effects reported from all subjects in the study.

Discussion

A decrease in mean leukocyte levels in the ω-3-enriched IVLE group was observed on third day after surgery. This result is in accordance with some previous studies. Wei et al. observed significant declines in leukocyte and CRP levels on patients who received ω-3-enriched IVLE for 6 days after undergoing gastric tumor resection20. Wang et al. also observed a significant decline in mean CRP level in subjects who received ω-3-enriched IVLE for 5 days after undergoing surgical interventions for acute pancreatitis21. A systematic review stated that fish oil-enriched IVLE is associated with a reduction in CRP level in patients with malignancy after undergoing gastrointestinal surgery22.

The content of EPA and DHA in ω-3 lipids may inhibit inflammatory pathways in several ways, such as inhibiting chemotaxis of leukocytes, expression of adhesion molecules, and adhesive endothelial-leukocyte interaction16.

CRP is an acute-phase protein synthesized by IL-6 induction from hepatocytes. The CRP level spikes in acute traumatic condition, e.g. after undergoing surgical intervention. CRP levels reflect rapid changes which occur in inflammatory conditions. A study showed that in the majority of patients, CRP levels rise for 3-12 hours after surgery, peaking at 24-72 hours, and return to baseline in 2 weeks after surgery22.

This study did not find any significant difference in IL-1β dan IL-8 levels between the two groups. This result is in accordance with some previous studies, including Ma et al. who did not find any difference in mean preoperative and postoperative (day-6) IL-1β levels between subjects who received intravenous MCT/LCT lipid emulsion and subjects who received intravenous MCT/LCT/OO/FO lipid emulsion for five consecutive days. Nevertheless, several studies yielded contrasting results23.

A study by Wei et al. on 48 subjects who had undergone gastrointestinal tumor resection also found a significant reduction in mean IL-1β level on group receiving intravenous LCT/FO lipid emulsion compared to group receiving intravenous LCT lipid emulsion20. In addition, Han et al., on 38 postoperative subjects in surgical intensive care unit, found a significant reduction in mean IL-1 and IL-8 levels on subjects who received MCT/LCT/FO lipid emulsion for 7 days, compared to subjects who received MCT/LCT lipid emulsion after undergoing surgical interventions24.

A proposed explanation to why our result is inconsistent with most of the previous studies is that in our study, intravenous lipid emulsion was only given for 3 days, while in other studies, which yielded significant reduction in mean proinflammatory cytokine levels, intravenous lipid emulsion was given for at least 6 days. In this study, levels of IL-1β and IL-8 were examined preoperatively and 72 hours after surgery. According to Lin and Lowry, systemic inflammation, which occurs after surgery, may trigger proinflammatory and anti-inflammatory cytokines. Among all types of cytokines, TNF-α is the earliest to emerge, followed by IL-6 as the cytokine with the highest level amongst all. TNF-α and IL-6 levels peak in 1-2 hours after surgery25. Our previous study showed a significant difference in mean IL-6 levels between subjects receiving MCT/LCT and subjects receiving MCT/LCT/OO/FO17. Lin and Lowry stated that the half-life of IL-1β in systemic circulation is less than 10 minutes, making it more difficult to detect during stressful periods than TNF-α. Proinflammatory cytokine mediators, such as IL-8, are released as part of the inflammatory cascade initiated by IL-125.

This study also observed that ω-6 fatty acids levels in the ω-3-enriched IVLE group was lower than the standard MCT/LCT IVLE group, on third day after surgery. This result is in accordance with several previous studies. Skouroliakou et al. found a significantly lower mean ω-6 fatty acids level in plasma fatty acid in preterm neonates who received ω-3-enriched IVLE for 15 and 30 days compared to soybean oil on the third day after abdominal surgery26. Grim et al. showed a significant decline of ω-6 fatty acids levels in plasma phospholipids in 33 adult patients after major abdominal surgery who received ω-3-enriched fat emulsion for 6 days27. The composition of fatty acids in cell membrane phospholipids has a significant role on cellular responses and cell function. Membrane order and lipid raft assembly are affected by the fatty acid makeup of membrane phospholipids. The fatty acid composition of the second messengers that are obtained from membrane phospholipid influences their biological activity and potency. Fatty acids that released from membrane phospholipids upon cellular activation are forming some lipid mediators28. Nevertheless, our results on profiling of fatty acid in serum, such as ω6/ω3 ratio, EPA level, and DHA level, contradict previous studies which found a significant decline in ω-3-enriched fat emulsion group27,2931. This discrepancy might be due to dissimilarity of subjects’ characteristics, and the duration of parenteral nutrition administration. In those studies, the standard IVLE used were 100% LCT/soybean oil-based lipid emulsion, not MCT/LCT IVLE like in our study.

To our knowledge, this is the first study in Indonesia to compare the effect of MCT/LCT/OO/FO IVLE with MCT/LCT IVLE on proinflammatory IL-1β and IL-8 levels and fatty acid composition in infants who had underwent gastrointestinal surgery. Further studies are needed to determine the difference in pathogenesis between adults and infants after undergoing gastrointestinal surgery, which may be associated with the difference in effects of MCT/LCT/OO/FO IVLE on their profiling of fatty acid compositions.

There were no adverse event or serious adverse event reported in this study. Limitation of this study include that it is a single-centre study with a small sample size. Our study did not have a long period of follow-up and is not a double-blind study.

Conclusion

In infants who underwent gastrointestinal surgery, MCT/LCT/OO/FO IVLE can significantly lower leukocyte, CRP and ω-6 fatty acids levels, and is comparable with standard IVLE on IL-1β & IL-8 levels.

Data availability

Underlying data

Figshare: Data Set Comparison of Two Lipid Emulsions on Interleukin-1β, Interleukin-8 and Fatty Acid Composition in Infants Post Gastrointestinal Surgery: A Randomized Trial. https://doi.org/10.6084/m9.figshare.12906320.v219.

This project contains the underlying data for the study in SAV and CSV formats.

Reporting guidelines

Figshare: CONSORT checklist for ‘Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial’ https://doi.org/10.6084/m9.figshare.12906320.v432.

Data are available under the terms of the Creative Commons Attribution 4.0 International license (CC-BY 4.0).

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Hanindita MH, Irawan R, Ugrasena IDG and Hariastawa IGBA. Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial [version 3; peer review: 3 approved]. F1000Research 2020, 9:1168 (https://doi.org/10.12688/f1000research.26269.3)
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Calder P. Reviewer Report For: Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial [version 3; peer review: 3 approved]. F1000Research 2020, 9:1168 (https://doi.org/10.5256/f1000research.31417.r76333)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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1
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Reviewer Report 22 Dec 2020
I Gusti Lanang Sidiartha, Child Health Department, Faculty of Medicine, Sanglah General Hospital, Udayana University, Denpasar, Indonesia 
Approved
VIEWS 1
I have read this revised version and I ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Sidiartha IGL. Reviewer Report For: Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial [version 3; peer review: 3 approved]. F1000Research 2020, 9:1168 (https://doi.org/10.5256/f1000research.31417.r76335)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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1
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Reviewer Report 22 Dec 2020
Peter Stehle, Department of Nutrition and Food Sciences, University of Bonn, Bonn, Germany 
Approved
VIEWS 1
No ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Stehle P. Reviewer Report For: Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial [version 3; peer review: 3 approved]. F1000Research 2020, 9:1168 (https://doi.org/10.5256/f1000research.31417.r76334)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Version 2
VERSION 2
PUBLISHED 20 Nov 2020
Revised
Views
3
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Reviewer Report 30 Nov 2020
I Gusti Lanang Sidiartha, Child Health Department, Faculty of Medicine, Sanglah General Hospital, Udayana University, Denpasar, Indonesia 
Approved
VIEWS 3
PICO of this manuscript:
  • P: infants who underwent gastrointestinal surgery.
     
  • I: mix intravenous lipid emulsion, MCT/LCT/OO/FO.
     
  • C: intravenous lipid emulsion, standard.
     
... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Sidiartha IGL. Reviewer Report For: Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial [version 3; peer review: 3 approved]. F1000Research 2020, 9:1168 (https://doi.org/10.5256/f1000research.30813.r75205)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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3
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Reviewer Report 23 Nov 2020
Peter Stehle, Department of Nutrition and Food Sciences, University of Bonn, Bonn, Germany 
Approved
VIEWS 3
In general, the authors adequately answered my questions and modified the manuscript accordingly. Still not optimal is the definition ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Stehle P. Reviewer Report For: Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial [version 3; peer review: 3 approved]. F1000Research 2020, 9:1168 (https://doi.org/10.5256/f1000research.30813.r75125)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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24
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Reviewer Report 23 Nov 2020
Philip Calder, School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, UK 
Not Approved
VIEWS 24
This is the revised version of this manuscript. The authors have taken the previous comments seriously and have made significant revisions. These certainly improve the manuscript. However, some minor points for correction remain (see below). In addition there are serious ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Calder P. Reviewer Report For: Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial [version 3; peer review: 3 approved]. F1000Research 2020, 9:1168 (https://doi.org/10.5256/f1000research.30813.r75124)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 21 Dec 2020
    Meta Herdiana Hanindita, Doctoral Program, Faculty of Medicine, Universitas Airlangga, Surabaya, 60286, Indonesia
    21 Dec 2020
    Author Response
    Thank you again for your willingness to re-review this article. There are some changes made based on your suggestions. These are the responses to your previous comments.
    1. The
    ... Continue reading
COMMENTS ON THIS REPORT
  • Author Response 21 Dec 2020
    Meta Herdiana Hanindita, Doctoral Program, Faculty of Medicine, Universitas Airlangga, Surabaya, 60286, Indonesia
    21 Dec 2020
    Author Response
    Thank you again for your willingness to re-review this article. There are some changes made based on your suggestions. These are the responses to your previous comments.
    1. The
    ... Continue reading
Version 1
VERSION 1
PUBLISHED 24 Sep 2020
Views
15
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Reviewer Report 06 Oct 2020
Peter Stehle, Department of Nutrition and Food Sciences, University of Bonn, Bonn, Germany 
Approved with Reservations
VIEWS 15
This manuscript summarizes results gained within a clinical nutrition trial in infants after gastrointestinal surgery. Infants parenterally received either a "traditional", omega 6-rich lipid emulsion composed of soybean oil and MCT, in the "verum" group a newly composed lipid emulsion produced with ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Stehle P. Reviewer Report For: Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial [version 3; peer review: 3 approved]. F1000Research 2020, 9:1168 (https://doi.org/10.5256/f1000research.28994.r71909)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 20 Nov 2020
    Meta Herdiana Hanindita, Doctoral Program, Faculty of Medicine, Universitas Airlangga, Surabaya, 60286, Indonesia
    20 Nov 2020
    Author Response
    Thank you for your willingness to review this paper. 

    1. Details on the power calculation are already added in the paper. The parameter that  was used for sample size ... Continue reading
COMMENTS ON THIS REPORT
  • Author Response 20 Nov 2020
    Meta Herdiana Hanindita, Doctoral Program, Faculty of Medicine, Universitas Airlangga, Surabaya, 60286, Indonesia
    20 Nov 2020
    Author Response
    Thank you for your willingness to review this paper. 

    1. Details on the power calculation are already added in the paper. The parameter that  was used for sample size ... Continue reading
Views
23
Cite
Reviewer Report 28 Sep 2020
Philip Calder, School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, UK 
Not Approved
VIEWS 23
This manuscript describes findings from a clinical trial in neonates who underwent surgery and then were randomised to receive one of two lipid emulsions intravenously over the course of 3 days. One lipid emulsion was a mix of coconut and ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Calder P. Reviewer Report For: Comparison of two lipid emulsions on interleukin-1β, interleukin-8 and fatty acid composition in infants post gastrointestinal surgery: a randomized trial [version 3; peer review: 3 approved]. F1000Research 2020, 9:1168 (https://doi.org/10.5256/f1000research.28994.r71910)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 20 Nov 2020
    Meta Herdiana Hanindita, Doctoral Program, Faculty of Medicine, Universitas Airlangga, Surabaya, 60286, Indonesia
    20 Nov 2020
    Author Response
    Thank you for your willingness to review this paper, it's a great honour for us. 

    1. Serum omega-3 fatty acid finding is already included in the abstract. 

    2. ... Continue reading
COMMENTS ON THIS REPORT
  • Author Response 20 Nov 2020
    Meta Herdiana Hanindita, Doctoral Program, Faculty of Medicine, Universitas Airlangga, Surabaya, 60286, Indonesia
    20 Nov 2020
    Author Response
    Thank you for your willingness to review this paper, it's a great honour for us. 

    1. Serum omega-3 fatty acid finding is already included in the abstract. 

    2. ... Continue reading

Comments on this article Comments (0)

Version 3
VERSION 3 PUBLISHED 24 Sep 2020
Comment
Alongside their report, reviewers assign a status to the article:
Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions
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