The voltage-dependent L-type Ca2+ (CaV1.2) channel C-terminus fragment is a bi-modal vasodilator

John P. Bannister, Marie Dennis Leo, Damodaran Narayanan, Wanchana Jangsangthong, Anitha Nair, Kirk W. Evanson, Judith Pachuau, Kyle S. Gabrick, Frederick Boop, Jonathan Jaggar

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Voltage-dependent L-type Ca2+ channels (CaV1.2) are the primary Ca2+ entry pathway in vascular smooth muscle cells (myocytes). CaV1.2 channels control systemic blood pressure and organ blood flow and are pathologically altered in vascular diseases, which modifies vessel contractility. The CaV1.2 distal C-terminus is susceptible to proteolytic cleavage, which yields a truncated CaV1.2 subunit and a cleaved C-terminal fragment (CCt). Previous studies in cardiac myocytes and neurons have identified CCt as both a transcription factor and CaV1.2 channel inhibitor, with different signalling mechanisms proposed to underlie some of these effects. CCt existence and physiological functions in arterial myocytes are unclear, but important to study given the functional significance of CaV1.2 channels. Here, we show that CCt exists in myocytes of both rat and human resistance-size cerebral arteries, where it locates to both the nucleus and plasma membrane. Recombinant CCt expression in arterial myocytes inhibited CaV1.2 transcription and reduced CaV1.2 protein. CCt induced a depolarizing shift in the voltage dependence of both CaV1.2 current activation and inactivation, and reduced non-inactivating current in myocytes. Recombinant truncated CCt lacking a putative nuclear localization sequence (Δ92CCt) did not locate to the nucleus and had no effect on arterial CaV1.2 transcription or protein. However, Δ92CCt shifted the voltage dependence of CaV1.2 activation and inactivation similarly to CCt. CCt and Δ92CCt both inhibited pressure- and depolarization-induced vasoconstriction, although CCt was a far more effective vasodilator. These data demonstrate that endogenous CCt exists and reduces both CaV1.2 channel expression and voltage sensitivity in arterial myocytes. Thus, CCt is a bi-modal vasodilator.

Original languageEnglish (US)
Pages (from-to)2987-2998
Number of pages12
JournalJournal of Physiology
Volume591
Issue number12
DOIs
StatePublished - Jun 1 2013

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Vasodilator Agents
Muscle Cells
Smooth Muscle Myocytes
Cerebral Arteries
Vasoconstriction
Vascular Diseases
Vascular Smooth Muscle
Cardiac Myocytes
Proteins
Transcription Factors
Cell Membrane
Blood Pressure
Neurons
Pressure

All Science Journal Classification (ASJC) codes

  • Physiology

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The voltage-dependent L-type Ca2+ (CaV1.2) channel C-terminus fragment is a bi-modal vasodilator. / Bannister, John P.; Leo, Marie Dennis; Narayanan, Damodaran; Jangsangthong, Wanchana; Nair, Anitha; Evanson, Kirk W.; Pachuau, Judith; Gabrick, Kyle S.; Boop, Frederick; Jaggar, Jonathan.

In: Journal of Physiology, Vol. 591, No. 12, 01.06.2013, p. 2987-2998.

Research output: Contribution to journalArticle

Bannister, JP, Leo, MD, Narayanan, D, Jangsangthong, W, Nair, A, Evanson, KW, Pachuau, J, Gabrick, KS, Boop, F & Jaggar, J 2013, 'The voltage-dependent L-type Ca2+ (CaV1.2) channel C-terminus fragment is a bi-modal vasodilator', Journal of Physiology, vol. 591, no. 12, pp. 2987-2998. https://doi.org/10.1113/jphysiol.2013.251926
Bannister, John P. ; Leo, Marie Dennis ; Narayanan, Damodaran ; Jangsangthong, Wanchana ; Nair, Anitha ; Evanson, Kirk W. ; Pachuau, Judith ; Gabrick, Kyle S. ; Boop, Frederick ; Jaggar, Jonathan. / The voltage-dependent L-type Ca2+ (CaV1.2) channel C-terminus fragment is a bi-modal vasodilator. In: Journal of Physiology. 2013 ; Vol. 591, No. 12. pp. 2987-2998.
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AU - Nair, Anitha

AU - Evanson, Kirk W.

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