端粒酶活性调节的研究进展

端粒是真核细胞线性染色体末端6bp重复序列及相关蛋白质组成的特殊结构,端粒酶是合成端粒DNA重复序列的逆转录酶。普遍认为端粒酶在肿瘤的发生发展中具有重要作用。端粒酶在体内是如何被调节的,目前还知之甚少。对端粒酶活性调节的研究包括激活与抑制两个方面,抑制端粒酶以治疗肿瘤,激活端粒酶以延缓衰老。     

端粒酶活性检测及检测方法的研究进展

研究发现大多数恶性肿瘤存在端粒酶活性 ,而人正常体细胞几乎未检出端粒酶活性。表明肿瘤发生与端粒酶活化密切相关 ,使端粒酶有希望成为新的恶性肿瘤标记。但仍有部分肿瘤未检出端粒酶活性 ,个别组织的肿瘤端粒酶活性检出率较低 ,使对端粒酶的肿瘤检测作用产生怀疑。本文就近年来检测端粒酶活性作为肿瘤诊断标志物的研究新进展概述如下     

端粒、端粒酶与肿瘤诊治的研究进展

端粒酶已经成为当今最受重视的抗肿瘤治疗的新靶点之一，人们对于端粒及端粒酶的认识也在不断加深,端粒酶可作为肿瘤诊断和预后的一个重要生物标志，抑制端粒酶可能成为一种有发展前途的抗肿瘤措施。本文综述了端粒和端粒酶的构成和功能，“端粒-端粒酶”假说，端粒酶与肿瘤的关系。     

端粒酶活性检测及检测方法的研究进展

研究发现大多数恶性肿瘤存在端粒酶活性,而人正常体细胞几乎未检出端粒酶活性。表明肿瘤发生与端粒酶活化密切相关,使端粒酶有希望成为新的恶性肿瘤标记。但仍有部分肿瘤未检出端粒酶活性,个别组织的肿瘤端粒酶活性检出率较低,使对端粒酶的肿瘤检测作用产生怀疑。本文就近扯为检测端粒酶活性作为肿瘤诊断标志物的研究新进展概述如下。     

端粒酶活性调节的研究进展

端粒是真核细胞线性染色体末端6bp重复序列及相关蛋白质组成的特殊结构，端粒酶是合成端粒DNA重复序列的逆转录酶。普遍认为端粒酶在肿瘤的发生发展中具有重要作用。端粒酶在体内是如何被调节的，目前还知之甚少。对端粒酶活性调节的研究包括激活与抑制两个方面，抑制端粒酶以治疗肿瘤，激活端粒酶以延缓衰老。     

端粒及端粒酶在恶性血液病中的研究进展

端粒和端粒酶是近来生命科学研究的热点之一。本文就有关端粒及端粒酶与恶性血液病关系的最新进展作一简述,讨论了端粒长度和端粒酶活性在疾病发生发展中的意义。端粒酶作为肿瘤标记物和治疗靶子日益受到重视。     

端粒、端粒酶研究与肿瘤诊断

近年来有关端粒酶的研究进展很快，这些研究证明了端粒、端粒酶与许多肿瘤的发生、发展过程有密切的联系。端粒酶很有可能成为一个很有前途的肿瘤标志物。本文总结了有关端粒长度调节和端粒酶表达调节等方面的最新进展，重点强调了端粒酶在肿瘤诊断中的可能作用及存在的问题。     

针对端粒酶的肿瘤治疗研究进展

目的 分析针对端粒酶肿瘤治疗研究的进展。方法 对近年来端粒及端粒酶的研究进行调查分析。结果 端粒及端粒酶与肿瘤发生和异常增殖密切相关，近年来，端粒及端粒酶的研究已成为生物学热点，也是人类抗肿瘤药物研究的重要“靶点”，随着人们对端粒及端粒酶结构和功能认识的加深，针对端粒酶的抗肿瘤治疗研究也不断深入。结论 针对端粒酶的肿瘤治疗研究有多种途径和方法，但是单一的端粒酶抑制是否可以作为一种主要的治疗手段来治疗肿瘤还有待临床试验来检验。     

端粒、端粒酶与消化道肿瘤

端粒的结构、功能,端粒酶的结构、功能及在癌变中的作用使之成为当前研究的热点.本文就端粒、端粒酶及其在消化道肿瘤中的表达、端粒酶检测及端粒酶抑制剂等方面做一综述.1 端粒与端粒酶1.1 端粒端粒是位于线形染色体末端的一种保护结构,Muller和Mcclintock在30、40年代就认识到了染色体的端粒.     

端粒酶研究进展

端粒酶是一种核糖核蛋白，主要由RNA及蛋白质组成。其RNA含有与端粒互补的模板区序列，能特异识别端粒引物位点及复制端粒序列。它的蛋白质成分由其亚单位构成，能与端粒引物及端粒酶RNA特异交联或结合。由端粒酶指导端粒合成机制所建立的端粒酶活性检测方法在人体肿瘤研究中取得了重要进展。     

Tiotidine and cimetidine--kinetics and dynamics

Tiotidine and cimetidine kinetics and dynamics were compared to assess mechanisms of the longer duration of effect of tiotidine in man. Both drugs has similar lag times for absorption. Tiotidine with a meal was more slowly absorbed than when fasting and was also more slowly absorbed than cimetidine with a meal. The elimination rates for both drugs did not differ; they were both approximately 2 to 3 hr. Oral doses of cimetidine achieved areas under the plasma concentration curve approximately three times that of tiotidine but these concentrations were only 1/10 as potent. The cimetidine concentration inducing 50% inhibition of food-stimulated gastric acid secretion was 0.41 +/- 0.04 whereas it was 0.04 +/- 0.003 microgram/ml for tiotidine. The effect of tiotidine lasted longer than that of cimetidine because the doses recommended for use in man resulted in higher concentrations in plasma relative to effective concentration than clinical doses of cimetidine.     

Developments and trends in traditional medicine and complementary and alternative medicine

With the rapid development of society, medical science and technology, although quality of life is enhanced and life expectancy is prolonged, aging, environmental changes and health problems are unavoidable. More and more people, therefore, are concerned about their health and place high demands on medical care. As modern medicine cannot meet all such demands, other medical care systems emerge. Trends in the seeking of medical care show that people are inclined towards natural approaches, so attention is being paid once again to traditional medicine, as well as complementary and alternative medicine. Under the patient-oriented concept, medical personnel have to recognize means of health care while thinking of the individualized and socioeconomic impacts. The purpose of this paper therefore is to provide medical personnel with information on the developments and trends in, knowledge and research with regard to traditional medicine as well as complementary and alternative medicine.