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2017 ; 2
(8
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
?-Klotho deficiency protects against obesity through a crosstalk between liver,
microbiota, and brown adipose tissue
#MMPMID28422755
Somm E
; Henry H
; Bruce SJ
; Aeby S
; Rosikiewicz M
; Sykiotis GP
; Asrih M
; Jornayvaz FR
; Denechaud PD
; Albrecht U
; Mohammadi M
; Dwyer A
; Acierno JS Jr
; Schoonjans K
; Fajas L
; Greub G
; Pitteloud N
JCI Insight
2017[Apr]; 2
(8
): ä PMID28422755
show ga
?-Klotho (encoded by Klb) is the obligate coreceptor mediating FGF21 and FGF15/19
signaling. Klb-/- mice are refractory to beneficial action of pharmacological
FGF21 treatment including stimulation of glucose utilization and thermogenesis.
Here, we investigated the energy homeostasis in Klb-/- mice on high-fat diet in
order to better understand the consequences of abrogating both endogenous
FGF15/19 and FGF21 signaling during caloric overload. Surprisingly, Klb-/- mice
are resistant to diet-induced obesity (DIO) owing to enhanced energy expenditure
and BAT activity. Klb-/- mice exhibited not only an increase but also a shift in
bile acid (BA) composition featured by activation of the classical (neutral) BA
synthesis pathway at the expense of the alternative (acidic) pathway. High
hepatic production of cholic acid (CA) results in a large excess of
microbiota-derived deoxycholic acid (DCA). DCA is specifically responsible for
activating the TGR5 receptor that stimulates BAT thermogenic activity. In fact,
combined gene deletion of Klb and Tgr5 or antibiotic treatment abrogating
bacterial conversion of CA into DCA both abolish DIO resistance in Klb-/- mice.
These results suggested that DIO resistance in Klb-/- mice is caused by high
levels of DCA, signaling through the TGR5 receptor. These data also demonstrated
that gut microbiota can regulate host thermogenesis via conversion of primary
into secondary BA. Pharmacologic or nutritional approaches to selectively
modulate BA composition may be a promising target for treating metabolic
disorders.