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Gene expression of connective tissue growth factor in adult mouse

The connective tissue growth factor (CTGF) is a well-known fibroblast mitogen and angiogenic factor that plays an important role in bone formation during embryogenesis. In the adult, CTGF is involved in wound healing as well as fibrotic and vascular disease. However, little is known about its physiological functions under non-pathological conditions in the adult organism. Here, we describe the cellular site of the CTGF mRNA expression in adult male and female mice as revealed by in situ hybridization histochemistry. Strong and persistent CTGF gene expression was particularly prominent in the mesenchyme of the cardiovascular system (aorta, auricular tissue, renal glomeruli), the mesenchyme surrounding the ovarian follicles or the testicular tubes in the gonadal tissue, and the subcapsular mesenchyme bordering densely innervated parts of whisker hair vibrissae. CTGF hybridization signals were not observed in the mesenchyme of many other organs including gut, muscle, liver or most parts of the lymphatic tissue. Strong expression was also present in the primary (early) ovarian follicles, the epithelium of the deep uterine glands and on myenteric ganglia neurons. These data suggest a selective and continuous mesenchymal function in the gonads and those tissues attracting very strong vascular supply or peripheral innervation. CTGF may also be involved in the cyclical proliferation of the uterine gland epithelium and in the early stages of follicular maturation, as well as in the neuropeptide regulation in the gut, cardiovascular and renal systems.