Perivascular adipose tissue control of insulin-induced vasoreactivity in muscle is impaired in db/db mice

Publikation: Bidrag til tidsskriftTidsskriftartikel

  • Rick I Meijer
  • Wineke Bakker
  • Caro-Lynn A F Alta
  • Pieter Sipkema
  • John S Yudkin
  • Benoit Viollet
  • Richter, Erik A.
  • Yvo M Smulders
  • Victor W M van Hinsbergh
  • Erik H Serné
  • Etto C Eringa
Microvascular recruitment in muscle is a determinant of insulin sensitivity. Whether perivascular adipose tissue (PVAT) is involved in disturbed insulin-induced vasoreactivity is unknown, as are the underlying mechanisms. This study investigates whether PVAT regulates insulin-induced vasodilation in muscle, the underlying mechanisms, and how obesity disturbs this vasodilation. Insulin-induced vasoreactivity of resistance arteries was studied with PVAT from C57BL/6 or db/db mice. PVAT weight in muscle was higher in db/db mice compared with C57BL/6 mice. PVAT from C57BL/6 mice uncovered insulin-induced vasodilation; this vasodilation was abrogated with PVAT from db/db mice. Blocking adiponectin abolished the vasodilator effect of insulin in the presence of C57BL/6 PVAT, and adiponectin secretion was lower in db/db PVAT. To investigate this interaction further, resistance arteries of AMPKa2(+/+) and AMPKa2(-/-) were studied. In AMPKa2(-/-) resistance arteries, insulin caused vasoconstriction in the presence of PVAT, and AMPKa2(+/+) resistance arteries showed a neutral response. On the other hand, inhibition of the inflammatory kinase Jun NH(2)-terminal kinase (JNK) in db/db PVAT restored insulin-induced vasodilation in an adiponectin-dependent manner. In conclusion, PVAT controls insulin-induced vasoreactivity in the muscle microcirculation through secretion of adiponectin and subsequent AMPKa2 signaling. PVAT from obese mice inhibits insulin-induced vasodilation, which can be restored by inhibition of JNK.
OriginalsprogEngelsk
TidsskriftDiabetes
Vol/bind62
Udgave nummer2
Sider (fra-til)590-598
Antal sider9
ISSN0012-1797
DOI
StatusUdgivet - 2013

Bibliografisk note

CURIS 2013 NEXS 005

ID: 41813313