Left ventricular hypertrophy and metabolic resetting in the Notch3-deficient adult mouse heart

Del Gaudio, FrancescaKarolinska Inst, Dept Cell & Mol Biol, Stockholm, Sweden. (författare)

The heart depends on a functional vasculature for oxygenation and transport of nutrients, and it is of interest to learn how primary impairment of the vasculature can indirectly affect cardiac function and heart morphology. Notch3-deficiency causes vascular smooth muscle cell (VSMC) loss in the vasculature but the consequences for the heart remain largely elusive. Here, we demonstrate that Notch3(-/-) mice have enlarged hearts with left ventricular hypertrophy and mild fibrosis. Cardiomyocytes were hypertrophic but not hyperproliferative, and the expression of several cardiomyocyte markers, including Tnt2, Myh6, Myh7 and Actn2, was altered. Furthermore, expression of genes regulating the metabolic status of the heart was affected: both Pdk4 and Cd36 were downregulated, indicating a metabolic switch from fatty acid oxidation to glucose consumption. Notch3(-/-) mice furthermore showed lower liver lipid content. Notch3 was expressed in heart VSMC and pericytes but not in cardiomyocytes, suggesting that a perturbation of Notch signalling in VSMC and pericytes indirectly impairs the cardiomyocytes. In keeping with this, Pdgfb(ret/ret) mice, characterized by reduced numbers of VSMC and pericytes, showed left ventricular and cardiomyocyte hypertrophy. In conclusion, we demonstrate that reduced Notch3 or PDGFB signalling in vascular mural cells leads to cardiomyocyte dysfunction.

Liu, DongliKarolinska Inst, Dept Cell & Mol Biol, Stockholm, Sweden.;Guangxi Med Univ Nanning, Dept Pediat, Affiliated Hosp 1, Nanning, Guangxi, Peoples R China. (författare)
Andaloussi Mäe, MaarjaUppsala universitet,Vaskulärbiologi(Swepub:uu)maaan970 (författare)
Braune, Eike-BenjaminKarolinska Inst, Dept Cell & Mol Biol, Stockholm, Sweden. (författare)
Hansson, Emil M.Karolinska Inst, Dept Cell & Mol Biol, Stockholm, Sweden. (författare)
Wang, Qing-DongAstraZeneca, Biosci Cardiovasc Res & Early Dev, Cardiovasc Renal & Metab CVRM, BioPharmaceut R&D, Gothenburg, Sweden. (författare)
Betsholtz, ChristerUppsala universitet,Vaskulärbiologi,Karolinska Inst, Dept Med, Huddinge, Sweden.(Swepub:uu)chbet517 (författare)
Lendahl, UrbanKarolinska Inst, Dept Cell & Mol Biol, Stockholm, Sweden. (författare)
Karolinska Inst, Dept Cell & Mol Biol, Stockholm, Sweden.Karolinska Inst, Dept Cell & Mol Biol, Stockholm, Sweden.;Guangxi Med Univ Nanning, Dept Pediat, Affiliated Hosp 1, Nanning, Guangxi, Peoples R China. (creator_code:org_t)

Av författaren/redakt...: Del Gaudio, Fran ...; Liu, Dongli; Andaloussi Mäe, ...; Braune, Eike-Ben ...; Hansson, Emil M.; Wang, Qing-Dong; visa fler...; Betsholtz, Chris ...; Lendahl, Urban; visa färre...

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