title: Regulation of matrix metalloproteinase-9 (MMP-9) by translational efficiency in murine prostate carcinoma cells.
abstract: Expression of increased levels of matrix metalloproteinase-9 (MMP-9) has been implicated in tumor progression and angiogenesis. Much of our knowledge of the controls of MMP-9 levels has focused on transcription. Here we show that MMP-9 levels are also controlled by translational efficiency in murine prostate carcinoma cells. The murine prostate carcinoma cells 148-1,LMD and 148-1,PA were derived from a single mouse that had been implanted with urogenital sinus transformed by ras and myc. 148-1,PA secretes little MMP-9 yet has equivalent amounts of MMP-9 mRNA as the cell line 148-1,LMD that secretes substantially more. Infection with a retroviral vector for murine MMP-9 led to more expression of MMP-9 in both cases, but the differential remained. Human MMP-9 is equally expressed in both cells after infection with a vector for human MMP-9 indicating that the effect is species-specific. Pulse chase analysis revealed that MMP-9 was synthesized more rapidly in the 148-1,LMD cells than in the 148-1,PA cells. Markedly more MMP-9 mRNA was associated with polysomes in the cell line synthesizing more MMP-9. These results indicate regulation of MMP-9 synthesis at the level of translational efficiency.
authors.affiliation: Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Yong
authors.initials: Y
authors.lastname: Jiang
authors.forename: Ruth J
authors.initials: RJ
authors.lastname: Muschel
mesh_terms: D000818:Animals; D005822:Genetic Vectors / Q000235:genetics; D008297:Male; D020780:Matrix Metalloproteinase 9 / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D051379:Mice; D011471:Prostatic Neoplasms / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012190:Retroviridae / Q000235:genetics
chemical_list: D012333:RNA, Messenger; D020780:Matrix Metalloproteinase 9