Characterization of capsaicin induced responses in mice vas deferens: evidence of CGRP uptake

Majid Sheykhzade; Saurabh Gupta; Tinne Sørensen; Ole Aabling Sørensen; Hans Koch; Harrie C M Boonen; Ole Back; Bjarne Fjalland

doi:10.1016/j.ejphar.2011.06.031

Characterization of capsaicin induced responses in mice vas deferens: evidence of CGRP uptake

Majid Sheykhzade, Saurabh Gupta, Tinne Sørensen, Ole Aabling Sørensen, Hans Koch, Harrie C M Boonen, Ole Back, Bjarne Fjalland

Department of Clinical Medicine

8 Citations (Scopus)

Abstract

Calcitonin gene-related peptide (CGRP) is extensively distributed in primary afferent sensory nerves, including those innervating the genitourinary tract. Capsaicin can stimulate the release of CGRP from intracellular stores of these nerves, but this phenomenon has not been investigated in-depth in isolated preparations. The present study sets out to study and characterize the capsaicin as well as CGRP-induced responses in isolated mouse vas deferens. The effects of capsaicin and CGRP family of peptides were studied on electrically-induced twitch responses in the absence or presence of transient receptor potential cation channel vanilloid subfamily member 1 (TRPV1) antagonist and CGRP receptor antagonists. Twitch responses were attenuated by capsaicin (1 nM-30 nM) and CGRP family of peptides. The potency order was CGRP > intermedin-long (IMDL) ∼ [Cys(Et) ^2,7]αCGRP ∼ adrenomedullin (AM) > [Cys(ACM) ^2,7]αCGRP > amylin (AMY). These responses were disinhibited by the CGRP receptor antagonists and TRPV1 antagonists. The addition of CGRP receptor antagonists caused a transient potentiation of the twitch response and this potentiation was blocked by pretreatment with capsaicin and enhanced by incubation with exogenous CGRP. During the second consecutive cumulative concentration-response curve with capsaicin, the first phase of concentration-response curve disappeared and this was partially restored when the mouse vas deferens was preincubated with CGRP, suggesting the uptake of exogenous CGRP by nerves. Besides showing capsaicin-induced CGRP releases this study shows that exogenous CGRP can be taken up in vas deferens and can be re-released. CGRP uptake will add another dimension in understanding the homeostasis of this neuropeptide.

Original language	English
Journal	European Journal of Pharmacology
Volume	667
Issue number	1-3
Pages (from-to)	375-382
ISSN	0014-2999
DOIs	https://doi.org/10.1016/j.ejphar.2011.06.031
Publication status	Published - 30 Sept 2011

Keywords

Former Faculty of Pharmaceutical Sciences

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10.1016/j.ejphar.2011.06.031

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@article{9e2d226bbc394924a8ea0547458ac22b,

title = "Characterization of capsaicin induced responses in mice vas deferens: evidence of CGRP uptake",

abstract = "Calcitonin gene-related peptide (CGRP) is extensively distributed in primary afferent sensory nerves, including those innervating the genitourinary tract. Capsaicin can stimulate the release of CGRP from intracellular stores of these nerves, but this phenomenon has not been investigated in-depth in isolated preparations. The present study sets out to study and characterize the capsaicin as well as CGRP-induced responses in isolated mouse vas deferens. The effects of capsaicin and CGRP family of peptides were studied on electrically-induced twitch responses in the absence or presence of transient receptor potential cation channel vanilloid subfamily member 1 (TRPV1) antagonist and CGRP receptor antagonists. Twitch responses were attenuated by capsaicin (1 nM-30 nM) and CGRP family of peptides. The potency order was CGRP > intermedin-long (IMDL) ∼ [Cys(Et) 2,7]αCGRP ∼ adrenomedullin (AM) > [Cys(ACM) 2,7]αCGRP > amylin (AMY). These responses were disinhibited by the CGRP receptor antagonists and TRPV1 antagonists. The addition of CGRP receptor antagonists caused a transient potentiation of the twitch response and this potentiation was blocked by pretreatment with capsaicin and enhanced by incubation with exogenous CGRP. During the second consecutive cumulative concentration-response curve with capsaicin, the first phase of concentration-response curve disappeared and this was partially restored when the mouse vas deferens was preincubated with CGRP, suggesting the uptake of exogenous CGRP by nerves. Besides showing capsaicin-induced CGRP releases this study shows that exogenous CGRP can be taken up in vas deferens and can be re-released. CGRP uptake will add another dimension in understanding the homeostasis of this neuropeptide.",

keywords = "Former Faculty of Pharmaceutical Sciences",

author = "Majid Sheykhzade and Saurabh Gupta and Tinne S{\o}rensen and S{\o}rensen, {Ole Aabling} and Hans Koch and Boonen, {Harrie C M} and Ole Back and Bjarne Fjalland",

note = "Copyright {\textcopyright} 2011. Published by Elsevier B.V.",

year = "2011",

month = sep,

day = "30",

doi = "10.1016/j.ejphar.2011.06.031",

language = "English",

volume = "667",

pages = "375--382",

journal = "European Journal of Pharmacology",

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TY - JOUR

T1 - Characterization of capsaicin induced responses in mice vas deferens

T2 - evidence of CGRP uptake

AU - Sheykhzade, Majid

AU - Gupta, Saurabh

AU - Sørensen, Tinne

AU - Sørensen, Ole Aabling

AU - Koch, Hans

AU - Boonen, Harrie C M

AU - Back, Ole

AU - Fjalland, Bjarne

PY - 2011/9/30

Y1 - 2011/9/30

N2 - Calcitonin gene-related peptide (CGRP) is extensively distributed in primary afferent sensory nerves, including those innervating the genitourinary tract. Capsaicin can stimulate the release of CGRP from intracellular stores of these nerves, but this phenomenon has not been investigated in-depth in isolated preparations. The present study sets out to study and characterize the capsaicin as well as CGRP-induced responses in isolated mouse vas deferens. The effects of capsaicin and CGRP family of peptides were studied on electrically-induced twitch responses in the absence or presence of transient receptor potential cation channel vanilloid subfamily member 1 (TRPV1) antagonist and CGRP receptor antagonists. Twitch responses were attenuated by capsaicin (1 nM-30 nM) and CGRP family of peptides. The potency order was CGRP > intermedin-long (IMDL) ∼ [Cys(Et) 2,7]αCGRP ∼ adrenomedullin (AM) > [Cys(ACM) 2,7]αCGRP > amylin (AMY). These responses were disinhibited by the CGRP receptor antagonists and TRPV1 antagonists. The addition of CGRP receptor antagonists caused a transient potentiation of the twitch response and this potentiation was blocked by pretreatment with capsaicin and enhanced by incubation with exogenous CGRP. During the second consecutive cumulative concentration-response curve with capsaicin, the first phase of concentration-response curve disappeared and this was partially restored when the mouse vas deferens was preincubated with CGRP, suggesting the uptake of exogenous CGRP by nerves. Besides showing capsaicin-induced CGRP releases this study shows that exogenous CGRP can be taken up in vas deferens and can be re-released. CGRP uptake will add another dimension in understanding the homeostasis of this neuropeptide.

AB - Calcitonin gene-related peptide (CGRP) is extensively distributed in primary afferent sensory nerves, including those innervating the genitourinary tract. Capsaicin can stimulate the release of CGRP from intracellular stores of these nerves, but this phenomenon has not been investigated in-depth in isolated preparations. The present study sets out to study and characterize the capsaicin as well as CGRP-induced responses in isolated mouse vas deferens. The effects of capsaicin and CGRP family of peptides were studied on electrically-induced twitch responses in the absence or presence of transient receptor potential cation channel vanilloid subfamily member 1 (TRPV1) antagonist and CGRP receptor antagonists. Twitch responses were attenuated by capsaicin (1 nM-30 nM) and CGRP family of peptides. The potency order was CGRP > intermedin-long (IMDL) ∼ [Cys(Et) 2,7]αCGRP ∼ adrenomedullin (AM) > [Cys(ACM) 2,7]αCGRP > amylin (AMY). These responses were disinhibited by the CGRP receptor antagonists and TRPV1 antagonists. The addition of CGRP receptor antagonists caused a transient potentiation of the twitch response and this potentiation was blocked by pretreatment with capsaicin and enhanced by incubation with exogenous CGRP. During the second consecutive cumulative concentration-response curve with capsaicin, the first phase of concentration-response curve disappeared and this was partially restored when the mouse vas deferens was preincubated with CGRP, suggesting the uptake of exogenous CGRP by nerves. Besides showing capsaicin-induced CGRP releases this study shows that exogenous CGRP can be taken up in vas deferens and can be re-released. CGRP uptake will add another dimension in understanding the homeostasis of this neuropeptide.

KW - Former Faculty of Pharmaceutical Sciences

U2 - 10.1016/j.ejphar.2011.06.031

DO - 10.1016/j.ejphar.2011.06.031

M3 - Journal article

C2 - 21741970

SN - 0014-2999

VL - 667

SP - 375

EP - 382

JO - European Journal of Pharmacology

JF - European Journal of Pharmacology

IS - 1-3

ER -

Characterization of capsaicin induced responses in mice vas deferens: evidence of CGRP uptake

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