{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,21]],"date-time":"2026-03-21T20:17:50Z","timestamp":1774124270208,"version":"3.50.1"},"reference-count":58,"publisher":"American Physiological Society","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American Journal of Physiology-Cell Physiology"],"published-print":{"date-parts":[[2008,5]]},"abstract":"<jats:p> Ornithine decarboxylase (ODC) is the first and rate-controlling enzyme in the synthesis of polyamines, which are essential for normal cell growth. We have previously demonstrated that IL-4 and IL-13 can stimulate rat aortic smooth muscle cell (RASMC) proliferation. The objective of this study was to determine whether IL-4 and IL-13 induce cell proliferation by upregulating ODC expression in RASMC. The results revealed that incubation of RASMC with IL-4 and IL-13 for 24 h caused four- to fivefold induction of ODC catalytic activity. The increased ODC catalytic activity was attributed to the increased expression of ODC mRNA. Moreover, these observations were paralleled by increased production of polyamines. We further investigated the signal transduction pathways responsible for ODC induction by IL-4 and IL-13. The data illustrated that PD-98059, a MEK (MAPK kinase) inhibitor, LY-294002, a phosphatidylinositol 3-kinase (PI3K) inhibitor, and H-89, a protein kinase A (PKA) inhibitor, substantially decreased the induction of ODC catalytic activity and ODC mRNA expression induced by IL-4 and IL-13, suggesting positive regulation of the ODC gene by ERK, PI3K, and PKA pathways. Interestingly, dexamethasone, a known inhibitor of cell proliferation, completely abrogated the response of RASMC to IL-4 and IL-13. Furthermore, the inhibition of ODC by these inhibitors led to the reduced production of polyamines and decreased DNA synthesis as monitored by [<jats:sup>3<\/jats:sup>H]thymidine incorporation. Our data indicate that upregulation of ODC by IL-4 and IL-13 might play an important role in the pathophysiology of vascular disorders characterized by excessive smooth muscle growth. <\/jats:p>","DOI":"10.1152\/ajpcell.00325.2007","type":"journal-article","created":{"date-parts":[[2008,3,27]],"date-time":"2008-03-27T01:00:59Z","timestamp":1206579659000},"page":"C1198-C1205","source":"Crossref","is-referenced-by-count":22,"title":["IL-4 and IL-13 upregulate ornithine decarboxylase expression by PI3K and MAP kinase pathways in vascular smooth muscle cells"],"prefix":"10.1152","volume":"294","author":[{"given":"Liu Hua","family":"Wei","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yang","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guoyao","family":"Wu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Louis J.","family":"Ignarro","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"24","reference":[{"key":"R1","doi-asserted-by":"crossref","unstructured":"Alessi DR, Cuenda A, Cohen P, Dudley DT, Saltiel AR. 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