What does this research mean for the field?

The 130-kDa smooth muscle myosin light chain kinase (smMLCK) is ubiquitously expressed across all adult tissues rather than being specific to smooth muscle, whereas skMLCK is the only truly tissue-specific MLCK isoform. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To characterize the distribution and expression patterns of myosin light chain kinase isoforms in cardiac and skeletal muscle tissues.

November 1, 2000AJP Cell PhysiologyOpen Access

Smooth muscle myosin light chain kinase expression in cardiac and skeletal muscle

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Population

Cardiac tissue, purified cardiac myocytes, a cardiac myocyte cell line, and skeletal muscle

Design

Preclinical

Authors

BHB. Paul HerringIndiana University School of Medicine SDShelley A.H. DixonIndiana University School of Medicine PGPatricia J. GallagherIndiana University School of Medicine

Discussion

Member takes

Implication

smMLCK ubiquity in cardiac muscle cautions against off-target effects; extends adult isoform mapping but leaves human translation open.

Key Points

To characterize the distribution and expression patterns of myosin light chain kinase isoforms in cardiac and skeletal muscle tissues.
Analyzed myosin light chain kinase (MLCK) expression in intact cardiac tissue, purified cardiac myocytes, and an established cardiac myocyte cell line (AT1).
Monitored MLCK isoform expression dynamics across skeletal muscle differentiation from undifferentiated myoblasts to adult skeletal muscle.
Cardiac tissue, purified myocytes, and AT1 cells expressed only a single classic MLCK isoform identical to 130-kDa smooth muscle MLCK (smMLCK).
Undifferentiated myoblasts initially expressed a 220-kDa nonmuscle MLCK, which declined during differentiation and was replaced by 130-kDa smMLCK and adult skMLCK.
The skMLCK isoform was exclusively restricted to adult skeletal muscle, whereas the 130-kDa smMLCK was ubiquitously expressed across all adult muscle and nonmuscle tissues examined.

Structured PICO

Population

Cardiac tissue, purified cardiac myocytes, a cardiac myocyte cell line (AT1), and skeletal muscle (undifferentiated myoblasts, differentiating, and adult)

Intervention

Characterization of myosin light chain kinase (MLCK) expression

Outcome

Expression patterns of MLCK isoformssurrogate

The 130-kDa smooth muscle myosin light chain kinase is ubiquitously expressed in adult tissues, including cardiac muscle, whereas skeletal muscle MLCK is tissue-specific.

Cite This Study

Herring et al. (2000) studied this question.

synapsesocial.com/papers/6a1bcd690a1f7575939cf2a8 https://doi.org/10.1152/ajpcell.2000.279.5.c1656

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Smooth muscle myosin light chain kinase expression in cardiac and skeletal muscle

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Smooth muscle myosin light chain kinase expression in cardiac and skeletal muscle

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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