Abstract:
:We tested the hypothesis that accumulation of H+ or inorganic phosphate (Pi) is responsible for the early contractile failure of hypoxia by measuring maximal Ca2+-activated pressure and 31P nuclear magnetic resonance spectra in Langendorff-perfused ferret hearts at 30 degrees C. Maximal Ca2+-activated pressure was identified by the saturation of pressure with respect to [Ca2+]o observed during tetani as [Ca2+]o was increased to 15 mM in HEPES-buffered, 100% O2-bubbled perfusate and during hypoxia induced by bubbling with room air or with 100% N2. Tetani were produced by pacing at 8-12 Hz following exposure to ryanodine (1-5 microM), an inhibitor of Ca2+ release from the sarcoplasmic reticulum, and were elicited once a minute to measure maximal Ca2+-activated pressure during acquisition of nuclear magnetic resonance spectra. An inverse correlation was observed between [Pi] and maximal Ca2+-activated pressure (r = -0.87 mean, n = 12), with an average decline of 8.6% in pressure per 1 mumol/g wet wt. increase in [Pi]. Intracellular pH (pHi) showed no significant correlation with maximal Ca2+-activated pressure (r = 0.49 mean, n = 12). Two other protocols, pacing at variable rates and gated measurements at two different times during the tetanus, were also used to correlate [Pi], pHi, and maximal Ca2+-activated pressure. These protocols confirmed the highly significant correlation between [Pi] and maximal Ca2+-activated pressure, as well as the lack of correlation with pHi. Acidosis induced by NH4Cl (20 mM) or by bubbling with 95% O2/5% CO2 was associated with less than 20% depression of maximal Ca2+-activated pressure in the pHi range down to 6.8, but much greater depression at lower pHi. The data are consistent with depression of maximal Ca2+-activated force during the early phase of hypoxia by Pi but not by H+.
journal_name
Circ Resjournal_title
Circulation researchauthors
Kusuoka H,Weisfeldt ML,Zweier JL,Jacobus WE,Marban Edoi
10.1161/01.res.59.3.270subject
Has Abstractpub_date
1986-09-01 00:00:00pages
270-82issue
3eissn
0009-7330issn
1524-4571journal_volume
59pub_type
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更新日期:1985-10-01 00:00:00
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更新日期:1988-07-01 00:00:00
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pub_type: 杂志文章
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更新日期:1981-08-01 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章
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更新日期:2008-02-29 00:00:00
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更新日期:2007-08-17 00:00:00
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pub_type: 杂志文章
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更新日期:1998-10-19 00:00:00
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pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.119.315279
更新日期:2020-01-31 00:00:00
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pub_type: 杂志文章,评审
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更新日期:1998-02-23 00:00:00
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更新日期:2003-05-16 00:00:00
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pub_type: 杂志文章,评审
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更新日期:1995-10-01 00:00:00
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更新日期:1978-02-01 00:00:00
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更新日期:1987-09-01 00:00:00
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pub_type: 杂志文章
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更新日期:1991-08-01 00:00:00
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pub_type: 杂志文章
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更新日期:1977-01-01 00:00:00
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pub_type: 杂志文章
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更新日期:2002-05-17 00:00:00