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. 1991 Dec;104(4):847–852. doi: 10.1111/j.1476-5381.1991.tb12516.x

Contraction of rat thoracic aorta strips by endothelin-1 in the absence of extracellular Ca2+.

H Itoh 1, H Higuchi 1, N Hiraoka 1, M Ito 1, T Konishi 1, T Nakano 1, K Lederis 1
PMCID: PMC1908849  PMID: 1810598

Abstract

1. Endothelin-1 (ET-1) caused a concentration-dependent contraction of helical strips from rat thoracic aorta in the absence of extracellular Ca2+. The Ca(2+)-depleted muscle strips, prepared by three repeated applications of 10(-2) M caffeine or 10(-6) M noradrenaline in Ca(2+)-free buffer, were contracted by 10(-8) M ET-1 in the same manner as non-treated strips. 2. In the absence of extracellular Ca2+, 10(-7) M phorbol 12-myristate 13-acetate (PMA), an activator of protein kinase C, induced a small but sustained contraction of the rat thoracic aorta strips within 60 min. Preincubation of the strips with 10(-7) M PMA for 60 min in Ca(2+)-free buffer, did not affect the 10(-8) M ET-1-induced contraction, but decreased the 5 x 10(-8) M phorbol 12,13-dibutyrate (PDB)-, or the 10(-7) M PMA-induced contraction, and potentiated the contraction induced by 10(-8) M urotensin II. Preincubation with 10(-8) M ET-1 (which induced maximum contraction) for 25 min in Ca(2+)-free buffer did not change the subsequent contraction induced by PMA (10(-7) M) or urotensin II (10(-8) M) but gave a somewhat lower maximum tension than in non-treated strips. 3. Calyculin-A, a potent inhibitor of phosphatase, also induced a contraction of the Ca(2+)-depleted muscle strips in Ca(2+)-free buffer. Preincubation of the strips with ET-1 (10(-8) M) or PMA (10(-7) M) decreased the calyculin-A (3 x 10(-8) M)-induced contraction.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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