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2015 ; 9
(2
): 143-50
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Gender-specific effects on food intake but no inhibition of age-related fat
accretion in transgenic mice overexpressing human IGFBP-2 lacking the
Cardin-Weintraub sequence motif
#MMPMID25663268
Wiedmer P
; Schwarz F
; Große B
; Schindler N
; Tuchscherer A
; Russo VC
; Tschöp MH
; Hoeflich A
J Cell Commun Signal
2015[Jun]; 9
(2
): 143-50
PMID25663268
show ga
IGFBP-2 affects growth and metabolism and is thought to impact on energy
homeostasis and the accretion of body fat via its heparin binding domains (HBD).
In order to assess the function of the HBD present in the linker domain (HBD1) we
have generated transgenic mice overexpressing mutant human IGFBP-2 lacking the
PKKLRP sequence and carrying a PNNLAP sequence instead. Transgenic mice expressed
high amounts of human IGFBP-2, while endogenous IGFBP-2 or IGF-I serum
concentrations were not affected. In both genders we performed a longitudinal
analysis of growth and metabolism including at least 4 separate time points
between the age of 10 and 52 weeks. Body composition was assessed by nuclear
magnetic resonance (NMR) analysis. Food intake was recorded by an automated
online-monitoring. We describe negative effects of mutant human IGFBP-2 on body
weight, longitudinal growth and lean body mass (p?0.05). Very clearly, negative
effects of mutant IGFBP-2 were not observed for fat mass accretion throughout
life. Instead, relative fat mass was increased in transgenic mice of both genders
(p?0.05). In male mice transgene expression significantly increased absolute
mass of total body fat over all age groups (p?0.05). Food intake was increased
in female but decreased in male transgenic mice at an age of 11 weeks. Thus our
study clearly provides gender- and time-specific effects of HBD1-deficient
hIGFBP-2 (H1d-BP-2) on fat mass accretion and food intake. While our data are in
principal agreement with current knowledge on the role of HB-domains for fat
accretion we now may also speculate on a role of HBD1 for the control of eating
behavior.