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• W2022853937 abstract "Androgen hormones and growth factors are implicated in pedicle formation and antler transformation in deer. The potential to form a pedicle and an antler is only found in the antlerogenic periosteum (AP) overlying the presumptive antler growth region. Histological studies (Li and Suttie, '94) showed that AP consists of an inner cellular layer and an outer fibrous layer. Pedicle and antler are mainly derived from the cellular layer cells of the AP. Ossification takes place in four stages: intramembranous (IMO), transitional (OPC), pedicle endochondral (pECO) and antler endochondral (aECO). However, the precise mechanism whereby androgen hormones and growth factors control pedicle and antler formation is unknown. The aim of this study was to use cell culture techniques to investigate how testosterone and IGF1 affects the proliferation of antlerogenic cells from the four ossification stages of pedicle/antler in vitro. The results showed that in serum-free medium IGF1 stimulated the proliferation of antlerogenic cells from all four ossification stages in a dose-dependent manner. In contrast, testosterone alone did not show any mitogenic effects on these antlerogenic cells. However, in the presence of IGF1, testosterone increased proliferation of the antlerogenic cells from the IMO and the OPC stages (pedicle tissue), and reduced proliferation of the antlerogenic cells from transformation point (TP) and aECO stages (antler tissue). Therefore, the results from the present in vitro study support the in vivo findings that androgen hormones stimulate pedicle formation but inhibit antler growth. The change in the mitogenic effects of testosterone on antlerogenic cells from positive to negative occurs approximately at the change in ossification type from OPC to pECO. Therefore, these results reinforce the hypothesis that the transformation from a pedicle to an antler takes place at the time when the ossification type changes from OPC to pECO rather than at the time when the pedicle grows to its full species-specific height. J. Exp. Zool. 284:82–90, 1999. © 1999 Wiley-Liss, Inc." @default.
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• W2022853937 date "1999-06-15" @default.
• W2022853937 modified "2023-09-28" @default.
• W2022853937 title "Effects of insulin-like growth factor 1 and testosterone on the proliferation of antlerogenic cells in vitro" @default.
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• W2022853937 doi "https://doi.org/10.1002/(sici)1097-010x(19990615)284:1<82::aid-jez11>3.0.co;2-k" @default.
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