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Sexual dimorphic evolution of metabolic programming in non-genetic non-alimentary mild metabolic syndrome model in mice depends on feed-back mechanisms integrity for pro-opiomelanocortin-derived endogenous substances

Loizzo, Stefano and Vella, Stefano and Loizzo, Alberto and Fortuna, Andrea and Di Biase, Antonella and Salvati, Serafina and Frajese, Giovanni Vanni and Agrapart, Vincent and Ramirez Morales, Rafael and Spampinato, Santi Mario and Campana, Gabriele and Capasso, Anna and Galietta, Gabriella and Guarino, Irene and Carta, Stefania and Carru, Ciriaco and Zinellu, Angelo and Ghirlanda, Giovanni and Seghieri, Giuseppe and Renzi, Paolo and Franconi, Flavia (2010) Sexual dimorphic evolution of metabolic programming in non-genetic non-alimentary mild metabolic syndrome model in mice depends on feed-back mechanisms integrity for pro-opiomelanocortin-derived endogenous substances. Peptides, Vol. 31 (8), p. 1598-1605. eISSN 1873-5169. Article.

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DOI: 10.1016/j.peptides.2010.05.006

Abstract

Previously, we showed that our post-natal handling model induces pro-opiomelanocortin-derived (POMC) endogenous systems alterations in male mice at weaning. These alterations last up to adult age, and are at the basis of adult hormonal and metabolic conditions similar to mild metabolic syndrome/type-2 diabetes. Here, we evaluate how sex influences post-natal programming in these metabolic conditions. Subjects are adult control (non-handled) female (NHF) and male (NHM) CD-1 mice; adult post-natal handled female (HF) and male (HM) mice. Handling consists of daily maternal separation (10 min) plus sham injection, from birth to weaning (21 days). In adult handled males (90-days old) we find not only POMC-derived hormones alterations (enhanced basal plasma corticosterone (+91%) and ACTH (+109%)) but also overweight (+5.4%), fasting hyperglycemia (+40%), hypertriglyceridemia (+21%), enhanced brain mRNA expression of hydroxysteroid(11-β)dehydrogenase type-1 (HSD11B1) (+49%), and decreased mRNA-HSD11B2 (−39%). Conversely, uric acid, creatinine, HDL(C), total cholesterol, glucose and insulin incremental area under-the-curve are not affected. In females, post-natal handling does not produce both hormonal and dysmetabolic diabetes-like changes; but handling enhances n3- and n6-poly-unsaturated, and decreases saturated fatty acids content in erythrocyte membrane composition in HF versus NHF. In conclusion, for the first time we show that female sex in mice exerts effective protection against the hypothalamus–pituitary–adrenal homeostasis disruption induced by our post-natal handling model on POMC cleavage products; endocrine disruption is in turn responsible for altered metabolic programming in male mice. The role of sex hormones is still to be elucidated.

Item Type:Article
ID Code:5599
Status:Published
Refereed:Yes
Uncontrolled Keywords:Pro-opiomelanocortin (POMC), ACTH, corticosterone, hypothalamus–pituitary–adrenal axis (HPA) upset, brain–body interaction, gender, post-natal handling
Subjects:Area 05 - Scienze biologiche > BIO/14 Farmacologia
Area 05 - Scienze biologiche > BIO/12 Biochimica clinica e biologia molecolare clinica
Divisions:001 Università di Sassari > 02 Centri > Centro di eccellenza interdisc. sviluppo ricerca biotecnologica e studio biodiversità della Sardegna e dell'area mediterranea
001 Università di Sassari > 01 Dipartimenti > Scienze biomediche
002 Altri enti e centri di ricerca del Nord Sardegna > National laboratory of the national institute of biostructures and biosystems, Osilo
001 Università di Sassari > 01 Dipartimenti > Scienze del farmaco
Publisher:Elsevier
eISSN:1873-5169
Deposited On:11 Mar 2011 10:31

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