Activation of GPR30 improves exercise capacity and skeletal muscle strength in senescent female Fischer344 × Brown Norway rats

Hao Wang, Allan Alencar, Marina Lin, Xuming Sun, Roberto T. Sudo, Gisele Zapata-Sudo, Dawn A. Lowe, Leanne Groban

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The molecular mechanisms of muscle weakness and sarcopenia in postmenopausal women are largely unknown. To determine the effect of a new estrogen receptor, GPR30, in the maintenance of exercise capacity and skeletal muscle function in females, the selective GPR30 agonist, G1 (100 μg/kg/day), or vehicle (V, soybean oil) was administered subcutaneously daily (n = 7 per group) to ovariectomized (OVX) 27-month-old Fischer 344 × Brown Norway (F344BN) female rats. Following 8 weeks of treatment, the exercise capacity (treadmill walk time to exhaustion) was reduced in OVX vs. sham rats (5.1 ± 1.4 vs. 11.0 ± 0.9 min, P < 0.05), and chronic G1 restored exercise capacity (12.9 ± 1.2 min; P < 0.05 vs. OVX-V). Similarly, the peak twitch of electrically stimulated soleus muscles was decreased by 22% in OVX vs. sham rats (P < 0.05), and G1 attenuated this decline (P < 0.05). Western blot analysis showed that chronic G1 treatment attenuated OVX-associated decreases in heat shock protein (HSP) 90, HSP70, and HSP27 expressions. In vitro studies using the L6 myoblast cell line demonstrated that G1 increased mRNA levels of HSPs in cultured cells. Collectively, these data demonstrate that the activation of GPR30 mitigates the adverse effects of estrogen loss on exercise capacity and skeletal muscle contractile function in old F344BN rats. The protective effects of GPR30 might be through its upregulation of heat shock proteins in skeletal muscle.

Original languageEnglish (US)
Pages (from-to)81-86
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume475
Issue number1
DOIs
StatePublished - Jun 17 2016

Bibliographical note

Funding Information:
This work was funded in part by National Institutes of Health grants AG-033727 to L.G., and AG031743 to D.L.

Keywords

  • Exercise capacity
  • Fischer344 × Brown Norway rat
  • GPR30
  • Ovariectomy
  • Skeletal muscle

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