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2014 ; 63
(6
): 1920-32
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The extracellular matrix protein MAGP1 supports thermogenesis and protects
against obesity and diabetes through regulation of TGF-?
#MMPMID24458361
Craft CS
; Pietka TA
; Schappe T
; Coleman T
; Combs MD
; Klein S
; Abumrad NA
; Mecham RP
Diabetes
2014[Jun]; 63
(6
): 1920-32
PMID24458361
show ga
Microfibril-associated glycoprotein 1 (MAGP1) is a component of extracellular
matrix microfibrils. Here we show that MAGP1 expression is significantly altered
in obese humans, and inactivation of the MAGP1 gene (Mfap2(-/-)) in mice results
in adipocyte hypertrophy and predisposition to metabolic dysfunction. Impaired
thermoregulation was evident in Mfap2(-/-) mice prior to changes in adiposity,
suggesting a causative role for MAGP1 in the increased adiposity and
predisposition to diabetes. By 5 weeks of age, Mfap2(-/-) mice were maladaptive
to cold challenge, uncoupling protein-1 expression was attenuated in the brown
adipose tissue, and there was reduced browning of the subcutaneous white adipose
tissue. Levels of transforming growth factor-? (TGF-?) activity were elevated in
Mfap2(-/-) adipose tissue, and the treatment of Mfap2(-/-) mice with a
TGF-?-neutralizing antibody improved their body temperature and prevented the
increased adiposity phenotype. Together, these findings indicate that the
regulation of TGF-? by MAGP1 is protective against the effects of metabolic
stress, and its absence predisposes individuals to metabolic dysfunction.