| First Author | Haq S | Year | 2003 |
| Journal | Nat Med | Volume | 9 |
| Issue | 7 | Pages | 944-51 |
| PubMed ID | 12808451 | Mgi Jnum | J:99600 |
| Mgi Id | MGI:3583061 | Doi | 10.1038/nm891 |
| Citation | Haq S, et al. (2003) Deletion of cytosolic phospholipase A2 promotes striated muscle growth. Nat Med 9(7):944-51 |
| abstractText | Generation of arachidonic acid by the ubiquitously expressed cytosolic phospholipase A2 (PLA2) has a fundamental role in the regulation of cellular homeostasis, inflammation and tumorigenesis. Here we report that cytosolic PLA2 is a negative regulator of growth, specifically of striated muscle. We find that normal growth of skeletal muscle, as well as normal and pathologic stress-induced hypertrophic growth of the heart, are exaggerated in Pla2g4a-/- mice, which lack the gene encoding cytosolic PLA2. The mechanism underlying this phenotype is that cytosolic PLA2 negatively regulates insulin-like growth factor (IGF)-1 signaling. Absence of cytosolic PLA2 leads to sustained activation of the IGF-1 pathway, which results from the failure of 3-phosphoinositide-dependent protein kinase (PDK)-1 to recruit and phosphorylate protein kinase C (PKC)-zeta, a negative regulator of IGF-1 signaling. Arachidonic acid restores activation of PKC-zeta, correcting the exaggerated IGF-1 signaling. These results indicate that cytosolic PLA2 and arachidonic acid regulate striated muscle growth by modulating multiple growth-regulatory pathways. |
