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Effects of sleeve gastrectomy and rs9930506 FTO variants on angiopoietin/Tie-2 system in fat expansion and M1 macrophages recruitment in morbidly obese subjects

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Abstract

Angiogenesis in inflammation are hallmarks for adipose tissue expansion in obesity. The role of angiopoietin/Tie-2 system in adipose tissue expansion and immune cell recruitment is unclear. We studied the effect of sleeve gastrectomy and the influence of FTO rs9930506 polymorphism on Tie-2, angiopoietin-1 and angiopoietin-2 expression in morbid obesity. Fifteen morbidly obese subjects (4 men and 11 women) aged 24–55 years were followed-up 3 and 6 months after sleeve gastrectomy. Serum sTie-2, angiopoietin-1, angiopoietin-2, and hypoxia-inducible factor-1α concentrations were determined by ELISA. Tie-2 and its ligands in visceral and subcutaneous adipose tissue were localized by immunohistochemistry. Tie-2 expression was measured by flow cytometry in circulating monocytes and infiltrated macrophages. Comparisons before and after sleeve gastrectomy were carried out using ANOVA for repeated measures. rs9930506FTO genotyping was performed by PCR-RFLP. Circulating sTie-2 and angiopoietin-2 were higher before sleeve gastrectomy. Tie-2 and angiopoietin-2 mRNA levels were higher in subcutaneous adipose tissue than visceral and both decreased after surgery. Monocytes and infiltrated macrophages showed a pro-inflammatory phenotype, with increased Tie-2 expression that decreased 3 and 6 months after sleeve gastrectomy. Baseline sTie-2 correlated inversely with adiponectin levels. At baseline the rs9930506FTO AG ó GG genotypes carriers had more 34 kg than genotype carriers of rs9930506 AA. Weight and body mass index decreased at 6 months. We found that angiopoietin/Tie-2 system is mainly expressed in subcutaneous adipose tissue, contributing to expandability, fat accumulation, and monocytes attachment in obesity. Bariatric surgery favorably modifies the pro-angiogenic profile, allowed a reduced angiogenic expression in the circulation and adipose tissue.

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Acknowledgments

We gratefully acknowledge the help of Dr. Jorge Martínez with IHC image analysis. We would also like to thank to Mrs. Angélica Franco Zermeño, Mrs. Luz María Frausto Morales and Mrs. Mónica Silva for their invaluable technical help.

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Authors and Affiliations

  1. Department of Medical Sciences, University of Guanajuato, León Campus, Av. 20 de Enero #929 Col. Obregón, C.P. 37320, León, Guanajuato, Mexico

    Nicté Figueroa-Vega, Elva Leticia Pérez-Luque & Juan Manuel Malacara

  2. Service of Laparoscopy and Bariatric Surgery, Hospital General Regional de León, Av. 20 de Enero #927, Col. Obregón, C.P. 37320, León, Guanajuato, Mexico

    Benjamín Jordán, Luis Parra-Laporte & Serafín Garnelo

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  1. Nicté Figueroa-Vega
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Figueroa-Vega, N., Jordán, B., Pérez-Luque, E.L. et al. Effects of sleeve gastrectomy and rs9930506 FTO variants on angiopoietin/Tie-2 system in fat expansion and M1 macrophages recruitment in morbidly obese subjects. Endocrine 54, 700–713 (2016). https://doi.org/10.1007/s12020-016-1070-y

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