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Research Project: Pediatric Clinical Nutrition

Location: Children's Nutrition Research Center

Title: Plasma endotoxin core antibody concentration and linear growth are unrelated in rural Malawian children aged 2-5 years

Author
item Benzoni, Nicole - Washington University
item Korpe, Poonum - Johns Hopkins University
item Thakwalakwa, Chrissie - University Of Malawi
item Maleta, Ken - University Of Malawi
item Stephenson, Kevin - Columbia University - New York
item Manary, Micah - University Of California
item Manary, Mark - Children'S Nutrition Research Center (CNRC)

Submitted to: BMC Research Notes
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/17/2015
Publication Date: 6/24/2015
Citation: Benzoni, N., Korpe, P., Thakwalakwa, C., Maleta, K., Stephenson, K., Manary, M., Manary, M. 2015. Plasma endotoxin core antibody concentration and linear growth are unrelated in rural Malawian children aged 2-5 years. BMC Research Notes. 8:258.

Interpretive Summary: This study was trying to find a test for gut irritation, commonly seen in rural African children, which retards their growth and development. The test assessed was a blood test looking for antibodies to bacteria in the gut. This test did not accurately identify gut irritation in these children and other tests should be sought.

Technical Abstract: Environmental enteropathy is subclinical inflammation of the upper gastrointestinal tract associated with reduced linear growth in developing countries. Usually investigators have used biopsy or a dual sugar absorption test to assess environmental enteropathy. Such tests are time and resource intensive, restricting their utility as screening methods. Serum endotoxin core antibody (EndoCab) concentration is a potential indicator of intestinal inflammation and integrity, and thus may be useful to predict environmental enteropathy. We analyzed the association of serum EndoCab levels versus linear growth and lactulose-mannitol assay results in 2-5 year old rural Malawian children. This was an observational study of 388 rural, asymptomatic Malawian children who had anthropometric measurements taken at least every 3 months since birth. In June and July 2011, dual sugar permeability tests were performed and serum samples were drawn for EndoCab assays. Pearson correlation, Student's t test and multivariable linear regression were used to compare ln EndoCab concentrations with height-for-age z scores (HAZ) at time of sampling and 3 months later. Identical analysis was also performed for ln EndoCab versus measurements from dual sugar permeability testing performed in conjunction with serum sampling. In a subgroup of children with anthropometric data in the months prior to serum sampling, Pearson correlation was used to estimate the relationship between ln EndoCab and recent linear growth. Ln EndoCab concentrations were not correlated with HAZ at time of measurement (B = -0.078, P = 0.14) nor change in HAZ over the subsequent 3 months HAZ (B = -0.018, P = 0.27). EndoCab concentration was not associated with %lactulose excretion (B < 0.001, P = 0.98) nor the lactulose:mannitol ratio (B = 0.021, P = 0.62). Subgroup analysis also did not reveal any significant association between EndoCab and recent growth. EndoCab titers were not correlated with measurements of growth or intestinal permeability in rural pre-school aged Malawian children.