Activation of skinned muscle fibres from the Norway lobster Nephrops norvegicus L. by manganese ions.

Abstract:

:Effects of Mn2+ and Ca2+ on the mechanical properties of glycerinated myofibrillar bundles originating from slow S1 type muscle fibres of superficial flexor muscles of the lobster Nephrops norvegicus were investigated. Mn2+ (5-20 microM) activated the preparations in a dose-dependent manner. The sensitivity of myofibrillar force generation for Mn2+ was around 30 times lower than that for Ca2+. The maximal tension produced under Mn2+ activation was about 75% of that under Ca2+ activation. At higher free Mn2+ concentrations (>2 mM), the steady-state force decreased; it was completely abolished at 30 mM free Mn2+. These high Mn2+ solutions were accompanied by changed in MgATP and MnATP concentrations, and in the ionic strength. Control experiments have shown that none of these parameters seemed fo account fully for the observed force depression in high Mn2+ solutions. It is likely that direct effects of Mn2+ such as a change of the myofilament surface charges are responsible. The maximal unloaded shortening velocity of the myofibrillar preparations was shown to be similar under maximal Mn2+ and Ca2+ activation. Conversely, the kinetics of stretch-induced delayed force increase were about two to three times faster under Mn2+ activation. These results suggest that certain steps of the cross-bridge cycle depend on the ion species bound to the regulatory proteins.

authors

Holmes JM,Hilber K,Galler S,Neil DM

doi

10.1023/a:1005312610629

subject

Has Abstract

pub_date

1998-06-01 00:00:00

pages

537-48

issue

5

eissn

0142-4319

issn

1573-2657

journal_volume

19

pub_type

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