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• W2020283509 abstract "1. The effects of inorganic phosphate (P(i)) on force, Ca(2+)-force relationship, ATPase activity, maximal shortening velocity (Vmax) and rate of tension development were investigated in chemically skinned preparations of smooth muscle from the guinea-pig taenia coli. 2. In maximally thiophosphorylated fibres, P(i) in the range 1-40 mM inhibited isometric force, with a reduction of 20% at 20 mM P(i). 3. The relative force was similar at all [Ca2+], i.e. the Ca(2+)-force relationship was not affected, when 20 mM P(i) was present. 4. After photolytic release of ATP from caged ATP in maximally thiophosphorylated fibres in the presence of 20 mM P(i), tension rose to a lower level but with a higher rate constant than in the absence of P(i). 5. Inorganic phosphate (20 mM) did not affect the ATP hydrolysis in fibres activated at intermediate [Ca2+] or by maximal thiophosphorylation. 6. Inorganic phosphate (20 mM) decreased force but did not influence Vmax in maximally activated fibres. At lower levels of activation by Ca2+, P(i) increased the Vmax and decreased force slightly without affecting the degree of myosin light chain phosphorylation. 7. We conclude that P(i) influences cross-bridge reactions associated with force generation in smooth muscle. These reactions are not rate limiting for cross-bridge turnover under isotonic or isometric conditions in maximally activated smooth muscle fibres, since P(i) did not influence Vmax or the rate of ATP turnover. 8. Since P(i) increased Vmax in submaximally activated muscles, we propose that, under these conditions, shortening velocity is rate limited by cross-bridge states, reached early after attachment, which impose a mechanical resistance to shortening." @default.
• W2020283509 created "2016-06-24" @default.
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• W2020283509 date "1995-04-15" @default.
• W2020283509 modified "2023-10-18" @default.
• W2020283509 title "Effects of inorganic phosphate on cross-bridge kinetics at different activation levels in skinned guinea-pig smooth muscle." @default.
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• W2020283509 doi "https://doi.org/10.1113/jphysiol.1995.sp020671" @default.
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