REGENERATION OF UTERINE EPITHELIUM AFTER EXPERIMENTAL ABLATION IN THE RAT

Regeneration of the uterine luminal epithelium was studied after its mechanical removal in progesterone-primed rats, leaving one control horn intact. Pulse labelling with [³H]TdR during regeneration, showed a rapid peak of labelling index in remaining glands. A differentiated and highly labelled luminal epithelium reappeared at 34 hr, thereafter showing a rapidly declining LI. After initial depletion, the glandular cell population size was restored within 64 hr, whereas luminal epithelium cell numbers became stabilized at about half normal level. Grain counts after prelabelling showed more rapid dilution in gland cells of stripped uterine horns, indicating accelerated cycling of previously dividing cells. Thymidine labelling indices also showed that, after removal of the epithelium, almost all gland cells became rapidly committed to divide. On average, less than two cell cycles were necessary to restore stable glandular and epithelial population sizes. Numbers of labelled cells were also drastically increased in myometrium and serosa of treated horns. This suggests a non-specific mechanism for stimulation of mitotic activity after ablation of epithelium.     

NAUTILOIDS WITH MULTIPLE PAIRED MUSCLE SCARS FROM LOWER–MIDDLE ORDOVICIAN OF BALTOSCANDIA

Abstract:  The number, outline and arrangement of muscle scars on the internal mould of the body chamber of five species of Early and Middle Ordovician nautiloids from Baltoscandia are described. The ellesmeroceratids Oelandoceras haelluddenense Foerste and Pictetoceras oliviae King have 9–10 pairs of muscle scars. The oncoceratid Phtanoncoceras ellipticum (Lossen), and Botellusoceras torpense gen. et sp. nov., order and family indeterminate, have eight and nine pairs of muscle scars, respectively. The tarphycerid Estonioceras imperfectum (Quenstedt) has four pairs of muscle scars.     

射频消融对心室肌细胞能量代谢酶系和Ca~（＋＋）－ATP酶影响的研究

本研究用定性和定量酶组织化学方法研究了经导管射频消融（Ｒａｄｉｏｆｒｅｑｕｅｎｃｙ　ｃａｔｈｅｔｅｒ　ａｂｌａｔｉｏｎ,ＲＦＣＡ）对豚鼠心室肌细胞乳酸脱氢酶（ＬＤＨ）,琥珀酸脱氢酶（ＳＤＨ）,细胞色素氧化酶（ＣＣＯ）和Ｃａ（＋＋）－ＡＴＰ酶（Ｃａ（＋＋）－ＡＴＰａｓｅ）的影响,并与其引起的病理组织学改变相比较。所用射频（５００ｋＨｚ）能量为２０Ｗ×１０ｓ。结果：在该能量水平下,ＲＦＣＡ对上述四种酶均能造成明显损伤,但其损伤范围之间无统计学差异。ＲＦＣＡ引起的病理组织学损伤范围与其引起的酶学损伤范围之间亦无统计学差异。提示ＲＦＣＡ引起的酶学损伤与其引起的组织学损伤具有一致性。     

碱性成纤维细胞生长因子对培养的瘢痕成纤维细胞FN合成的调控作用

目的探讨碱性成纤维细胞生长因子（bFGF）对成纤维细胞纤维连结蛋白（FN）合成的调控作用。方法采用细胞培养、ELISA法、RT-PCR方法观察bFGF在不同剂量下对瘢痕来源的成纤维细胞FN合成的影响。结果FN的表达在低bFGF浓度组与对照组无明显差异,随着浓度的升高表现为增高趋势,以50、100、500ng／ml最显著,与对照组之间有显著性差异（P〈0．05）。FN mRNA表达在50-100ng／ml组明显升高,与对照组间有显著性差异（P〈0．05）。mRNA表达趋势与上清中蛋白的表达具有一致性。结论高浓度bFGF刺激FN合成可能是bFGF促进创面愈合的重要原因。