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2017 ; 7
(1
): 5125
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Obesity-induces Organ and Tissue Specific Tight Junction Restructuring and
Barrier Deregulation by Claudin Switching
#MMPMID28698546
Ahmad R
; Rah B
; Bastola D
; Dhawan P
; Singh AB
Sci Rep
2017[Jul]; 7
(1
): 5125
PMID28698546
show ga
Obesity increases susceptibility to multiple organ disorders, however, underlying
mechanisms remain unclear. The subclinical inflammation assisted by
obesity-induced gut permeability may underlie obesity-associated co-morbidities.
Despite eminent clinical significance of the obesity led gut barrier
abnormalities, its precise molecular regulation remains unclear. It is also
unknown whether barrier deregulations, similar to the gut, characterize other
vital organs in obese individuals. The claudin family of proteins is integral to
the tight junction (TJ), the apical cell-cell adhesion and a key regulator of the
epithelial barrier. Using comprehensive physiological and biochemical analysis of
intestinal and renal tissues from high-fat diet fed mice, critical for
maintaining metabolic homeostasis, this study demonstrates that profound
TJ-restructuring by organ and tissue-specific claudin switching characterize
obese organs. Protein expression and cellular distribution were examined.
In-silico analysis further highlighted potential association of select claudins,
modulated by the obesity, with signaling and metabolic pathways of pathological
significance. In vitro studies using Leptin or DCA-treatment suggested causal
significance of obesity-induced changes in tissue microenvironment in regulating
barrier deregulations in tissue-specific manner. Overall, current findings
advances our understanding of the molecular undertakings of obesity associated
changes that help predispose to specific diseases and also identifies novel
windows of preventive and/or therapeutic interventions.