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. 1992 Jan;445:601–616. doi: 10.1113/jphysiol.1992.sp018942

Parvalbumin, labile heat and slowing of relaxation in mouse soleus and extensor digitorum longus muscles.

A Berquin 1, J Lebacq 1
PMCID: PMC1180000  PMID: 1501147

Abstract

1. Parvalbumin content, heat rate and rate of relaxation were measured in two mouse muscles: the slow-twitch soleus and the fast-twitch extensor digitorum longus (EDL). 2. No trace of parvalbumin was found in the soleus; EDL contained a mean of 4.86 mg of this protein per gram of fresh muscle (S.D. = 1.25). 3. Heat rate during 7 s isometric tetani in isolated soleus muscle at 20 degrees C can be described by the sum of an exponentially decaying term and a constant term. The exponential term is reduced by 67% in a second tetanus performed 1 s after a first one; its repriming is complete after a resting period of about 1 min. The exponential term has therefore the properties of labile heat. 4. Relaxation rate measured during 15 s of isometric interrupted tetani at 20 degrees C is nearly constant in the soleus, but decreases continuously with increasing tetanus duration in the EDL. In the latter, isometric tension also decreases continuously. 5. Therefore, parvalbumin can account neither for the labile heat production in mouse soleus nor for the slowing of relaxation associated with muscle fatigue observed after a few seconds of tetanus in EDL. The role of parvalbumin in striated muscles is thus reassessed, and other possible causes of labile heat production and slowing of relaxation are discussed.

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Selected References

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