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Cloning and Characterization of a Rat Ortholog of MMP-23 (Matrix Metalloproteinase-23), a Unique Type of Membrane-Anchored Matrix Metalloproteinase and Conditioned Switching of Its Expression during the Ovarian Follicular Development

Division of Biological Sciences (J.O., W.H., D.N., H.M., A.K., T.T.) Graduate School of Science Hokkaido University Sapporo 060-0810, Japan
Laboratory of Molecular and Cellular Pathology (E.O., M.J., H.S., K.N.) Hokkaido University School of Medicine CREST, JST (Japan Science and Technology) Sapporo 060-8638, Japan
Institute of Biological Sciences and Gene Experimental Center (K.N.) Tsukuba University Ibaraki 305-8572, Japan
Division of Morphogenesis (H.S.) Department of Developmental Biology National Institute for Basic Biology Okazaki 444-8585, Japan

In our attempt to study the role of matrix metalloproteinases (MMPs) in the process of mammalian ovulation, we isolated a rat ortholog of the recently reported human MMP-23 from gonadotropin-primed immature rat ovaries. Transient expression of epitope-tagged rat and human MMP-23 in COS-1 cells revealed that they were synthesized as a membrane-anchored glycoprotein with type II topology. Indirect immunofluorescent analysis showed that subcellular localization of MMP-23 was predominantly in the perinuclear regions. The transfected human MMP-23 protein was processed endogenously to the soluble form in COS-1 cells. However, cotransfection of MMP-23 with the mouse furin cDNA did not enhance this processing, indicating that furin may not be involved in this event. Notably, in situ hybridization analysis revealed a dramatic switching of MMP-23 mRNA localization from granulosa cells to theca-externa/fibroblasts and ovarian surface epithelium during the follicular development. In serum-free primary culture of rat granulosa cells, a drastic diminution of MMP-23 mRNA expression was observed in response to FSH action between 24 h and 48 h of culture. The observed effect of FSH on MMP-23 expression was mimicked by treatment of granulosa cells with forskolin or 8-bromo (Br)-cAMP. In contrast, MMP-23 mRNA levels increased in theca-interstitial cells regardless of the presence of LH in the culture. However, treatment of theca-interstitial cells with forskolin or 8-Br-cAMP markedly reduced the expression of MMP-23 with a concomitant increase in progesterone production. These results indicate that the MMP-23 gene is spatially and temporally regulated in a cell type-specific manner in ovary via the cAMP signaling pathway.

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