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- W2110491323 abstract "Calcitonin gene-related peptide (CGRP), a potent vasodilator released from a subset of sensory Adelta- and C-fiber afferents, has been suggested to play a beneficial role in myocardial ischemia. The aim of the present study was to investigate some receptors possibly involved in the proton-mediated CGRP release from the heart.CGRP release from freshly isolated hearts of mice lacking the capsaicin receptor (TRPV1-/-), the bradykinin receptor type 2 (B2-/-), or the acid-sensing ion channel type 3 (ASIC3-/-) and their wild-type littermates (TRPV1+/+, B2+/+, ASIC3+/+) were compared. Hearts were passed through a series of solutions based on oxygenated synthetic interstitial fluid (SIF). SIF buffered to pH 5.7 or 5.2 was used as an acidic test stimulus, and capsaicin (5x10(-7) M) was finally applied as a positive control. All eluates were processed using an enzyme immunoassay (EIA) for measurement of CGRP concentrations.SIF at pH 5.7 and 5.2 caused significant increases in CGRP release in TRPV1+/+ but not in mice lacking the TRPV1 receptor. The same acid stimuli caused no significant differences in CGRP release between ASIC3+/+ and ASIC3-/- or between B2+/+ and B2-/-, respectively. Capsaicin caused massive CGRP release in all mouse genotypes with the exception of TRPV1-/-.We conclude that cardiac acidosis is a strong stimulus to release CGRP from the mouse heart. This effect seems to be primarily mediated through activation of TRPV1 receptors that are known to be expressed by slowly conducting nociceptive primary afferent nerve fibers." @default.
- W2110491323 created "2016-06-24" @default.
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- W2110491323 date "2005-02-01" @default.
- W2110491323 modified "2023-09-27" @default.
- W2110491323 title "Role of different proton-sensitive channels in releasing calcitonin gene-related peptide from isolated hearts of mutant mice" @default.
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- W2110491323 doi "https://doi.org/10.1016/j.cardiores.2004.10.013" @default.
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