Abstract
The effect of phenylephrine (PE) on right ventricle papillary muscle (PM) and aortic segment (AS) contractile activity was studied in long-tailed ground squirrels Urocitellus undulatus during summer activity, torpor and interbout active (IBA) periods in comparison to rat. We found that PE (10 μM) exerts positive inotropic effect on ground squirrel PM that was blocked by α1-AR inhibitor—prazosin. PE differently affected frequency dependence of PM contraction in ground squirrels and rats. PE significantly increased the force of PM contraction in summer and hibernating ground squirrels including both torpor and IBA predominantly at the range of low stimulation frequencies (0.003–0.1 Hz), while in rat PM it was evident only at high stimulation frequency range (0.2–1.0 Hz). Further, it was found that PE vasoconstrictor effect on AS contractility is significantly higher in ground squirrels of torpid state compared to IBA and summer periods. Overall vasoconstrictor effect of PE was significantly higher in AS of ground squirrels of all periods compared to rats. Positive inotropic effect of PE on PM along with its vasoconstrictor effect on AS of ground squirrels was not affected by pretreatment with inhibitors of L-type Ca2+ channels, or Na+/Ca2+ exchanger or Ca2+-ATPase but was completely blocked by an inhibitor of store-operated Ca2+ entry (SOCE)—2-APB, suggesting the involvement of SOCE in the mechanisms underlying PE action on ground squirrel cardiovascular system. Obtained results support an idea about the significant role of alpha1-AR in adaptive mechanisms critical for the maintaining of cardiovascular contractile function in long-tailed ground squirrel Urocitellus undulatus.
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This work was supported by the Russian Foundation for Basic Research, project no. 18-04-00764.
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ASA and OVN designed the study. LAA, SSP, LSK and AIA contributed to reagents, analytical tools, and animal colony maintenance. ASA, OVN, LAA, LSK conducted the experiments. ASA and OVN analysed the data. ASA, MNN and OVN wrote the manuscript. All authors contributed to manuscript revisions.
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Averin, A.S., Andreeva, L.A., Popova, S.S. et al. α1-Adrenergic receptor regulates papillary muscle and aortic segment contractile function via modulation of store-operated Ca2+ entry in long-tailed ground squirrels Urocitellus undulatus. J Comp Physiol B 191, 927–939 (2021). https://doi.org/10.1007/s00360-021-01394-6
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DOI: https://doi.org/10.1007/s00360-021-01394-6