What does this research mean for the field?

The MKK6/p38 mitogen-activated protein kinase pathway plays a central and necessary role in driving the hallmark features of myocardial cell hypertrophy, including increased cell size, sarcomeric organization, and cardiac-specific gene expression. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

The study aims to explore the role of the p38 MAPK pathway in cardiac cell growth and gene expression regulation.

October 6, 1997The Journal of Cell BiologyOpen Access

A Role for the p38 Mitogen-activated Protein Kinase Pathway in Myocardial Cell Growth, Sarcomeric Organization, and Cardiac-specific Gene Expression

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The study aims to explore the role of the p38 MAPK pathway in cardiac cell growth and gene expression regulation.
Cultured cardiac myocytes were transfected with constructs for MAPKs, specifically p38, JNK, and ERK.
Cell size, sarcomeric organization, and gene expression of natriuretic peptides were analyzed post-transfection.
The effects of specific upstream kinases and p38 inhibitors were evaluated in relation to growth features.
MKK6 (Glu) activation increased cell size and natriuretic peptide activity by up to 130-fold.
PE and MKK6 (Glu) induced sarcomeric organization, while JNK and ERK did not.
All growth features induced by MKK6 (Glu) or PE were inhibited by the p38-specific inhibitor SB 203580.

Structured PICO

Population

Cultured myocardial cells (cardiac myocytes)

Intervention

Transfection with MKK6 (Glu) to specifically activate p38, or treatment with phenylephrine (PE), with or without p38-specific inhibitor SB 203580

Comparator

Transfection with MEKK1COOH (JNK activation) or Raf-1 BXB (ERK activation)

Outcome

Changes in cell size, sarcomeric organization, and induction of A- and B-type natriuretic peptides (NPs) and α-skeletal actin (α-SkA) genessurrogate

Activation of the p38 MAPK pathway via MKK6 is sufficient to induce hallmark features of cardiac hypertrophy in cultured myocytes.

Discussion

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Implication

p38 MAPK activation suffices for hypertrophy features in vitro; leaves open necessity, in vivo role, and therapeutic targeting.

Cite This Study

Zechner et al. (1997) studied this question.

synapsesocial.com/papers/6a1d6fdb5b7fddc35205487a https://doi.org/10.1083/jcb.139.1.115

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A Role for the p38 Mitogen-activated Protein Kinase Pathway in Myocardial Cell Growth, Sarcomeric Organization, and Cardiac-specific Gene Expression

Key Points

Structured PICO

Discussion

Implication

Cite This Study

A Role for the p38 Mitogen-activated Protein Kinase Pathway in Myocardial Cell Growth, Sarcomeric Organization, and Cardiac-specific Gene Expression

Key Points

Structured PICO

Discussion

Implication

Cite This Study