Nutrient Transporter Expression in the Jejunum in Relation to Body Mass Index in Patients Undergoing Bariatric Surgery

卷:8

Irving, Brian A. ; Wood, G. Craig ; Bennotti, Peter N. ; Babu, Ellappan ; Deshpande, Abhishek ; Lent, Michelle R. ; Petrick, Anthony ; Gabrielsen, Jon ; Strodel, William ; Gerhard, Glenn S. ; Still, Christopher D. ; Ganapathy, Vadivel ; Rolston, David D. K.

Geisinger Hlth Syst

关键词: obesity;    morbid obesity;    nutrient transporters;    nutrient absorption;    gastrointestinal tract;   

DOI  :  10.3390/nu8110683

学科分类：食品科学和技术

【 摘 要 】

Nutrient tranters (NT) facilitate nutrient absorption and contribute to the regulation of circulating nutrients. In this cross-sectional study, we determined the associations between the level of obesity; mRNA abundance for NTs; and serum concentrations of amino acids, short-chain fatty acids, and glucose in patients with morbid obesity undergoing a Roux-en-Y gastric bypass. Proximal jejunal samples were obtained at the time of surgery from 42 patients (90% female, age = 42.6 +/- 11.9 years, pre-operative body mass index (BMI) = 55.5 +/- 11.3 kg/m(2)) undergoing a Roux-en-Y gastric bypass. RNA was extracted from the jejunal mucosa and quantitative real-time-PCR was performed for the NTs studied. BMI negatively correlated with jejunal mRNA abundance of the amino acid NTs TauT (r = -0.625, p < 0.0001), ASCT2 (r = -0.320, p = 0.039), LAT1 (r = -0.304, p = 0.05). BMI positively correlated with jejunal mRNA abundance of the lactate/short-chain fatty acid NT SMCT1 (r = 0.543, p = 0.0002). Serum concentrations of the short-chain fatty acids, butyric, valeric, and isocaproic acid correlated positively with BMI (n = 30) (r = 0.45, r = 0.44, r = 0.36, p <= 0.05; respectively). Lower jejunal mRNA abundance for the amino acid NTs TauT, ASCT2, and LAT1 could protect against further obesity-related elevations in circulating amino acids. The positive correlation between BMI and the jejunal mRNA abundance of the high-affinity short-chain fatty acid/monocarboxylate transporter SMCT1 is intriguing and requires further investigation.