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001-es BibID:	BIBFORM066382
Első szerző:	Kristóf Endre (általános orvos)
Cím:	Irisin modifies the differentiation program of subcutaneous human adipocytes and induces "browning" / E. K. Kristof, Q. M. Doan-Xuan, P. Bai, Z. Bacsó, L. Fésüs
Dátum:	2014
ISSN:	1742-464X
Megjegyzések:	Although brown adipose tissue (BAT) can be found only in small amounts in the human body after infancy, recent studies revealed that it has a major importance in regulating the energy balance of the entire body. Its oxidative metabolism contributes to energy expenditure during cold exposure and diet or physical exercise induced thermogenesis by triggering the differentiation of"brown adipocyte-like" or "beige" cells interspersed in subcutaneous white adipose tissue depots in a process called "browning". A very strong negative correlation has been found between obesity and BAT amount in humans. Targeting the currently known and unknown regulatory systems of "browning" might open up better strategies to specifically stimulate BAT in obese individuals to aidweight reduction.Irisin is a recently identified peptide hormone which is cleaved from the Fndc5 transmembrane protein and induces a "browning" program in subcutaneous white adipose tissue in mouse models. In humans, however, an escalating debate revolves around the secretion and metabolic effects of irisin. Our aim was to clarify whether human recombinant irsin was able to induce a browning program on differentiating human adipocytes.Human primary preadipocytes obtained from herniotomy were differentiated into white or brown adipocytes with or without long or short-term irisin treatment. Expression of white, brown and general adipocyte markers were determined by RT Q-PCR,immunoblotting or immunocytochemistry and changes in morphology (size and number of lipid droplets, expression of Ucp1 and Cidea in situ) were visualized and quantified by Laser Scanning Cytometry. Functional analysis was carried out using a Seahorse Bioscience XF-96 Analyzer.Irisin administration during white adipogenic differentiation resulted in a significant overexpression of several brown adipocyte marker genes (UCP1, ELOVL3, CIDEA, CYC1, PGC1A). Irisin treated cells had more and smaller lipid droplets, more mitochondrial DNA, higher functional mitochondrial respiration and expressed more Ucp1 and Cidea in situ than the in vitro differentiated white adipocytes. We conclude that irisin treatment is able to induce a browning program in differentiating human subcutaneous white adipocytes in culture conditions.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idézhető absztrakt Browning Irisin Laser Scanning Cytometry
Megjelenés:	Febs Journal 281 : Suppl. 1 (2014), p. 230. -
További szerzők:	Doan-Xuan, Quang-Minh (1986-) (biofizikus) Bai Péter (1976-) (biokémikus) Bacsó Zsolt (1963-) (biofizikus) Fésüs László (1947-) (orvos biokémikus)
Pályázati támogatás:	TÁMOP-4.2.2.A-11/1/KONV-2012-0023 TÁMOP TÁMOP-4.2.4.A/2-11/1-2012-0001 TÁMOP MTA-DE MTA Apoptózis és Genomika Kutatócsoport
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