Elevation of MMP activity in the sclera by cytokines associated with HSF has been implicated as a potential mechanism of tissue destruction in myopia [28,29]. was significantly increased with 100 ng/ml rhBMP-2 in a time-dependent manner (p<0.05). The HSF cell cycle moved to the S and S+G2M phases after rhBMP-2 stimulation at 100 ng/ml compared to normal cells (p<0.05).TIMP-2mRNA levels were significantly increased in HSF incubated for 24 Rabbit Polyclonal to SNAP25 h with 100 ng/ml rhBMP-2 (p<0.01). A 48 h incubation with 10 ng/ml or 100 ng/ml rhBMP-2 resulted in significantly increasedTIMP-2mRNA and protein expression and significantly decreasedMMP-2mRNA expression (p<0.01) while MMP-2 protein expression significantly decreased at 100 ng/ml rhBMP-2 (p<0.01). == Conclusions == Human sclera fibroblasts expressed BMP-2, which promoted cell proliferation, and elicited changes in MMP-2 and TIMP-2, might influence extracellular HC-030031 matrix synthesis. == Introduction == Scleral fibroblasts are involved in scleral remodeling, which occurs during axial elongation in myopia [1-3]. Many aspects of scleral extracellular matrix remodeling and fibroblast proliferation are regulated by specific growth factors including transforming growth factor- (TGF-), insulin-like growth factors I and II (IGF-I and IGF-II), and basic fibroblast growth factor (bFGF) [4-6]. The matrix metalloproteinase-2 (MMP-2) and tissue inhibitor of metalloproteinase-2 (TIMP-2) proteoglycans are involved in scleral extracellular matrix remodeling events associated with eye growth under both normal and myopic conditions [7,8]. Bone morphogenetic proteins (BMPs) are subgroups from the transforming growth factor- (TGF-) superfamily and have numerous cellular functions including development, morphogenesis, cell proliferation, apoptosis, and extracellular matrix synthesis [9]. Recent research suggests that BMPs have multiple body functions and are HC-030031 frequently designated body morphogenetic proteins [10]. BMP-2 is a bone morphogenetic protein and is also a potent osteoinductive cytokine. It induces bone and cartilage formation, controls fibroblast apoptosis, and regulates extracellular matrix synthesis in many tissues [11,12]. Additionally, BMP-2 expression has been detected in both adult and embryonic tissues of the cornea, the trabecular meshwork, the optic nerve head, the retina, and the conjunctiva [13-15]. Recent studies have suggested that BMP-2 is possibly involved in the pathophysiology of several ocular diseases [14-16]. Previous studies have not confirmed the presence of BMPs in the human sclera. We examined human scleral fibroblasts (HSF) for BMP-2 and examined the effects of recombinant human BMP-2 on HSF proliferation and extracellular matrix synthesis in this study. == Methods == == Tissue source == This study was approved by the Ethics Committee of Sun Yat-sen University (Guangzhou, China) and complied with the tenets of the Declaration of Helsinki for biomedical research involving human subjects. Healthy adult human eyes (n=4) from donors (age range 1823 years) were obtained from the Eye Bank of the Zhongshan Ophthalmic Center (Sun Yat-sen University). The specimens were numbered 1-4. == Sample sclera preparation == The anterior segments, vitreous bodies, choroids, and retinas were removed from specimens 1 and 2. The posterior sclera was cut into 55 mm2pieces, embedded with optimum cutting temperature compound (Sigma, St. Louis, MO), and cut into 5 m sections at 20 C. Sections were subsequently tiled onto slides (Corning Ltd, Tokyo, Japan), HC-030031 fixed with cool acetone for 15 min, air-dried, and kept frozen at 20 C until use. == Human scleral fibroblast isolation, culture, and identification == Specimens 3 and 4 were washed immediately in Hank’s balanced salt solution (HBSS, Gibco, Grand Island, NY) with penicillin (200 ug/ml; Invitrogen Corp, Carlsbad, CA) and gentamicin sulfate (400 g/ml; Invitrogen Corp, Carlsbad, CA). All eye contents were removed except the sclera. The sclera were trimmed into 11 mm pieces, placed in 25 mm2plastic culture bottles in Dulbeccos modified Eagle’s medium (DMEM, Gibco) with 1X antibiotic/antimycotic (Invitrogen Corp), and 10% fetal bovine serum (FBS, Gibco), and incubated at 37 C in a humidified incubator containing.