Cardiac Myosin Is a Substrate for Zipper-interacting Protein Kinase (ZIPK)
Key result
Knockdown of ZIPK in cardiac myocytes by small interfering RNA significantly decreased the extent of RLC Ser-15 phosphorylation, suggesting ZIPK acts as a cardiac RLC kinase.
Population
Heart tissue homogenates and isolated ventricular neonatal rat cardiac myocytes
Design
Preclinical
Authors
Discussion
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Member takes
Implication
May modulate cardiac contractility; hypothesis-generating in animals and requires human validation before any clinical consideration.
Structured PICO
P
Population
Heart tissue homogenates and isolated ventricular neonatal rat cardiac myocytes
I
Intervention
Purified ZIPK application and ZIPK knockdown via small interfering RNA (siRNA)
O
Outcome
Phosphorylation of cardiac myosin regulatory light chain (RLC) at Ser-15surrogate
ZIPK is identified as a novel kinase for cardiac myosin regulatory light chain, suggesting a potential role in regulating cardiac contractility.
Cite This Study
Chang et al. (2009) studied this question. ZIPK knockdown by small interfering RNA was evaluated on RLC Ser-15 phosphorylation. Knockdown of ZIPK in cardiac myocytes by small interfering RNA significantly decreased the extent of RLC Ser-15 phosphorylation, suggesting ZIPK acts as a cardiac RLC kinase.