What question did this study set out to answer?

To synthesize anatomical, mechanical, ultrastructural, and biochemical research on how molluscan smooth muscles enter and sustain the low-energy catch state.

October 14, 2020International Journal of Molecular SciencesOpen Access

Mechanism and Function of the Catch State in Molluscan Smooth Muscle: A Historical Perspective

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Why the study?

Despite extensive studies, the mechanism underlying the catch state in molluscan smooth muscles is not yet fully understood.

Population

Anterior byssus retractor muscle of Mytilus

Authors

HSHaruo SugiNihon University TOTetsuo OhnoTeikyo Heisei University MMMasamichi MoriyaShowa University

Discussion

Member takes

Implication

Synthesizes catch state mechanisms; leaves open relevance of twitchin to vertebrate cardiac muscle regulation.

Key Points

To synthesize anatomical, mechanical, ultrastructural, and biochemical research on how molluscan smooth muscles enter and sustain the low-energy catch state.
Reviewed ultrastructural and mechanical investigations evaluating the transition from active contraction to catch state under isotonic conditions in the anterior byssus retractor muscle (ABRM) of Mytilus.
Assessed electron microscopic, histochemical, and biochemical evidence tracking intracellular calcium translocation and the regulatory role of the giant protein twitchin.
Active contraction initiates via elevated intracellular free calcium concentration ([Ca2+]i), whereas the catch state persists after [Ca2+]i drops back to resting levels.
Mechanical and ultrastructural assessments confirm that muscle bundles sustain stretch resistance without continuous active energy consumption via specialized calcium redistribution.
Biochemical evaluations link the catch mechanism to twitchin, a high molecular mass protein modulating structural bridges in molluscan catch muscles.

Structured PICO

Population

Molluscan smooth muscle, specifically the anterior byssus retractor muscle (ABRM) of a bivalve molluscan animal, Mytilus

This historical perspective summarizes the current understanding of the catch state in molluscan smooth muscle, emphasizing the role of intracellular calcium and the protein twitchin.

Cite This Study

Sugi et al. (2020) studied this question.

synapsesocial.com/papers/6a7e28998f0996dc933ba0b4 https://doi.org/10.3390/ijms21207576

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Mechanism and Function of the Catch State in Molluscan Smooth Muscle: A Historical Perspective

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Mechanism and Function of the Catch State in Molluscan Smooth Muscle: A Historical Perspective

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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