Novel mechanism of endothelin-1-induced vasospasm after subarachnoid hemorrhage

An Xie, Yasuo Aihara, Vitali A. Bouryi, Elena Nikitina, Babak S. Jahromi, Zhen Du Zhang, Masataka Takahashi, R. Loch Macdonald*

*Corresponding author for this work

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Cerebral vasospasm is a major cause of morbidity and mortality after aneurysmal subarachnoid hemorrhage (SAH). It is a sustained constriction of the cerebral arteries that can be reduced by endothelin (ET) receptor antagonists. Voltage-gated Ca2+ channel antagonists such as nimodipine are relatively less effective. Endothelin-1 is not increased enough after SAH to directly cause the constriction, so we sought alternate mechanisms by which ET-1 might mediate vasospasm. Vasospasm was created in dogs, and the smooth muscle cells were studied molecularly, electrophysiologically, and by isometric tension. During vasospasm, ET-1, 10 nmol/L, induced a nonselective cation current carried by Ca2+ in 64% of cells compared with in only 7% of control cells. Nimodipine and 2-aminoethoxydiphenylborate (a specific antagonist of store-operated channels) had no effect, whereas SKF96365 (a nonspecific antagonist of nonselective cation channels) decreased this current in vasospastic smooth muscle cells. Transient receptor potential (TRP) proteins may mediate entry of Ca2+ through nonselective cationic pathways. We tested their role by incubating smooth muscle cells with anti-TRPC1 or TRPC4, both of which blocked ET-1-induced currents in SAH cells. Anti-TRPC5 had no effect. Anti-TRPC1 also inhibited ET-1 contraction of SAH arteries in vitro. Quantitative polymerase chain reaction and Western blotting of seven TRPC isoforms found increased expression of TRPC4 and a novel splice variant of TRPC1 and increased protein expression of TRPC4 and TRPC1. Taken together, the results support a novel mechanism whereby ET-1 significantly increases Ca 2+ influx mediated by TRPC1 and TRPC4 or their heteromers in smooth muscle cells, which promotes development of vasospasm after SAH.

Original languageEnglish (US)
Pages (from-to)1692-1701
Number of pages10
JournalJournal of Cerebral Blood Flow and Metabolism
Volume27
Issue number10
DOIs
StatePublished - Oct 1 2007

Fingerprint

Endothelin-1
Subarachnoid Hemorrhage
Smooth Muscle Myocytes
Nimodipine
1-(2-(3-(4-methoxyphenyl)propoxy)-4-methoxyphenylethyl)-1H-imidazole
Constriction
Cations
Intracranial Vasospasm
Cerebral Arteries
Protein Isoforms
Proteins
Arteries
Western Blotting
Dogs
Morbidity
Polymerase Chain Reaction
Mortality

Keywords

  • Aneurysmal or aneurismal subarachnoid hemorrhage
  • Endothelin
  • Subarachnoid hemorrhage
  • Subarachnoid hemorrhage-induced vasospasm
  • Vasospasm

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine

Cite this

Xie, An ; Aihara, Yasuo ; Bouryi, Vitali A. ; Nikitina, Elena ; Jahromi, Babak S. ; Zhang, Zhen Du ; Takahashi, Masataka ; Macdonald, R. Loch. / Novel mechanism of endothelin-1-induced vasospasm after subarachnoid hemorrhage. In: Journal of Cerebral Blood Flow and Metabolism. 2007 ; Vol. 27, No. 10. pp. 1692-1701.
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abstract = "Cerebral vasospasm is a major cause of morbidity and mortality after aneurysmal subarachnoid hemorrhage (SAH). It is a sustained constriction of the cerebral arteries that can be reduced by endothelin (ET) receptor antagonists. Voltage-gated Ca2+ channel antagonists such as nimodipine are relatively less effective. Endothelin-1 is not increased enough after SAH to directly cause the constriction, so we sought alternate mechanisms by which ET-1 might mediate vasospasm. Vasospasm was created in dogs, and the smooth muscle cells were studied molecularly, electrophysiologically, and by isometric tension. During vasospasm, ET-1, 10 nmol/L, induced a nonselective cation current carried by Ca2+ in 64{\%} of cells compared with in only 7{\%} of control cells. Nimodipine and 2-aminoethoxydiphenylborate (a specific antagonist of store-operated channels) had no effect, whereas SKF96365 (a nonspecific antagonist of nonselective cation channels) decreased this current in vasospastic smooth muscle cells. Transient receptor potential (TRP) proteins may mediate entry of Ca2+ through nonselective cationic pathways. We tested their role by incubating smooth muscle cells with anti-TRPC1 or TRPC4, both of which blocked ET-1-induced currents in SAH cells. Anti-TRPC5 had no effect. Anti-TRPC1 also inhibited ET-1 contraction of SAH arteries in vitro. Quantitative polymerase chain reaction and Western blotting of seven TRPC isoforms found increased expression of TRPC4 and a novel splice variant of TRPC1 and increased protein expression of TRPC4 and TRPC1. Taken together, the results support a novel mechanism whereby ET-1 significantly increases Ca 2+ influx mediated by TRPC1 and TRPC4 or their heteromers in smooth muscle cells, which promotes development of vasospasm after SAH.",
keywords = "Aneurysmal or aneurismal subarachnoid hemorrhage, Endothelin, Subarachnoid hemorrhage, Subarachnoid hemorrhage-induced vasospasm, Vasospasm",
author = "An Xie and Yasuo Aihara and Bouryi, {Vitali A.} and Elena Nikitina and Jahromi, {Babak S.} and Zhang, {Zhen Du} and Masataka Takahashi and Macdonald, {R. Loch}",
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Xie, A, Aihara, Y, Bouryi, VA, Nikitina, E, Jahromi, BS, Zhang, ZD, Takahashi, M & Macdonald, RL 2007, 'Novel mechanism of endothelin-1-induced vasospasm after subarachnoid hemorrhage', Journal of Cerebral Blood Flow and Metabolism, vol. 27, no. 10, pp. 1692-1701. https://doi.org/10.1038/sj.jcbfm.9600471

Novel mechanism of endothelin-1-induced vasospasm after subarachnoid hemorrhage. / Xie, An; Aihara, Yasuo; Bouryi, Vitali A.; Nikitina, Elena; Jahromi, Babak S.; Zhang, Zhen Du; Takahashi, Masataka; Macdonald, R. Loch.

In: Journal of Cerebral Blood Flow and Metabolism, Vol. 27, No. 10, 01.10.2007, p. 1692-1701.

Research output: Contribution to journalArticle

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T1 - Novel mechanism of endothelin-1-induced vasospasm after subarachnoid hemorrhage

AU - Xie, An

AU - Aihara, Yasuo

AU - Bouryi, Vitali A.

AU - Nikitina, Elena

AU - Jahromi, Babak S.

AU - Zhang, Zhen Du

AU - Takahashi, Masataka

AU - Macdonald, R. Loch

PY - 2007/10/1

Y1 - 2007/10/1

N2 - Cerebral vasospasm is a major cause of morbidity and mortality after aneurysmal subarachnoid hemorrhage (SAH). It is a sustained constriction of the cerebral arteries that can be reduced by endothelin (ET) receptor antagonists. Voltage-gated Ca2+ channel antagonists such as nimodipine are relatively less effective. Endothelin-1 is not increased enough after SAH to directly cause the constriction, so we sought alternate mechanisms by which ET-1 might mediate vasospasm. Vasospasm was created in dogs, and the smooth muscle cells were studied molecularly, electrophysiologically, and by isometric tension. During vasospasm, ET-1, 10 nmol/L, induced a nonselective cation current carried by Ca2+ in 64% of cells compared with in only 7% of control cells. Nimodipine and 2-aminoethoxydiphenylborate (a specific antagonist of store-operated channels) had no effect, whereas SKF96365 (a nonspecific antagonist of nonselective cation channels) decreased this current in vasospastic smooth muscle cells. Transient receptor potential (TRP) proteins may mediate entry of Ca2+ through nonselective cationic pathways. We tested their role by incubating smooth muscle cells with anti-TRPC1 or TRPC4, both of which blocked ET-1-induced currents in SAH cells. Anti-TRPC5 had no effect. Anti-TRPC1 also inhibited ET-1 contraction of SAH arteries in vitro. Quantitative polymerase chain reaction and Western blotting of seven TRPC isoforms found increased expression of TRPC4 and a novel splice variant of TRPC1 and increased protein expression of TRPC4 and TRPC1. Taken together, the results support a novel mechanism whereby ET-1 significantly increases Ca 2+ influx mediated by TRPC1 and TRPC4 or their heteromers in smooth muscle cells, which promotes development of vasospasm after SAH.

AB - Cerebral vasospasm is a major cause of morbidity and mortality after aneurysmal subarachnoid hemorrhage (SAH). It is a sustained constriction of the cerebral arteries that can be reduced by endothelin (ET) receptor antagonists. Voltage-gated Ca2+ channel antagonists such as nimodipine are relatively less effective. Endothelin-1 is not increased enough after SAH to directly cause the constriction, so we sought alternate mechanisms by which ET-1 might mediate vasospasm. Vasospasm was created in dogs, and the smooth muscle cells were studied molecularly, electrophysiologically, and by isometric tension. During vasospasm, ET-1, 10 nmol/L, induced a nonselective cation current carried by Ca2+ in 64% of cells compared with in only 7% of control cells. Nimodipine and 2-aminoethoxydiphenylborate (a specific antagonist of store-operated channels) had no effect, whereas SKF96365 (a nonspecific antagonist of nonselective cation channels) decreased this current in vasospastic smooth muscle cells. Transient receptor potential (TRP) proteins may mediate entry of Ca2+ through nonselective cationic pathways. We tested their role by incubating smooth muscle cells with anti-TRPC1 or TRPC4, both of which blocked ET-1-induced currents in SAH cells. Anti-TRPC5 had no effect. Anti-TRPC1 also inhibited ET-1 contraction of SAH arteries in vitro. Quantitative polymerase chain reaction and Western blotting of seven TRPC isoforms found increased expression of TRPC4 and a novel splice variant of TRPC1 and increased protein expression of TRPC4 and TRPC1. Taken together, the results support a novel mechanism whereby ET-1 significantly increases Ca 2+ influx mediated by TRPC1 and TRPC4 or their heteromers in smooth muscle cells, which promotes development of vasospasm after SAH.

KW - Aneurysmal or aneurismal subarachnoid hemorrhage

KW - Endothelin

KW - Subarachnoid hemorrhage

KW - Subarachnoid hemorrhage-induced vasospasm

KW - Vasospasm

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