A novel messenger ribonucleic acid homologous to human MAGE-D is strongly expressed in rat Sertoli cells and weakly in Leydig cells and is regulated by follitropin, lutropin, and prolactin

We have cloned a novel complementary DNA whose expression was decreased in rat Sertoli cell cultures after treatment with FSH. This complementary DNA encodes a protein of 570 amino acids and shares 92% homology with the human MAGE-D protein. In contrast to other MAGE genes (A, B, or C), we have shown that MAGE-D expression was ubiquitous in healthy rat tissues. In the seminiferous tubules, the MAGE-D was expressed in Sertoli cells but not in germ cells as demonstrated by RT-PCR and in situ hybridization, whereas for the other MAGE genes, expression has been shown to be restricted to germ cells. Interestingly, MAGE-D was also detected for the first time in the female gonad by Northern blotting. In MLTC-1 cells (mouse Leydig tumor cell line-1), LH and PRL stimulated MAGE-D expression. Using hypophysectomized rats, it was confirmed that FSH decreased MAGE-D expression, whereas LH and PRL increased MAGE-D messenger RNA level in the whole testis most probably through a direct action on Leydig cells. As MAGE-D is present in both the seminiferous compartment and interstitium and hormonally regulated in each, it is possible that it has specific functions in each compartment during the development and the maintenance of the testis.     

内皮素促进细胞增殖相关基因的表达和血管平滑肌细胞增殖

通过３Ｈ－ＴｄＲ掺入实验和ＲＮＡ印迹分析，观察了内皮素－１对大鼠血管平滑肌细胞ＤＮＡ合成及细胞增殖相关基因表达的影响。结果表明，内皮素－１作用于血管平滑肌细胞１２ｈ，３Ｈ－ＴｄＲ掺入开始增加，２４ｈ达到峰值。在内皮素－１作用下，原癌基因ｃ－ｆｏｓ和ｃ－ｊｕｎ进行快速瞬间表达，其表达活性在３０ｍｉｎ达到峰值，３ｈ后恢复到原来水平；Ｐ３４＾激酶基因在内皮素－１刺激１２ｈ后表达活性开始增加，至２４ｈ仍维     

碱性纤维母细胞生长因子对血管平滑肌细胞增殖的影响

应用＾３Ｈ－ＲｄＲ掺入实验，ＲＮＡ印迹分析和反转录－多降酶链反应等方法观察碱性纤维母细胞生长因子对大鼠血管平滑肌细胞ＤＮＡ合成及细胞增殖相关基因表达的影响，结果发现，碱性纤维母细胞增殖相关基因表达的影响，结果发现，碱性纤维母细胞生长因子作用于血管平滑肌细胞６ｈ后，＾３Ｈ－ＴｄＲ掺入开始增加，２４ｈ达到高峰，在一定浓度范围内，碱性纤维母细胞生长因子以血管平滑肌细胞的促增殖效应与浓度呈正相关。碱性纤维