Direct evidence that endogenous GM1 ganglioside can mediate thymocyte proliferation

The B subunit of cholera toxin, which is multivalent and binds exclusively to a specific ganglioside, GM1, was mitogenic for rat thymocytes. When exposed to the B subunit, the cells proliferated, as measured by 3H-labeled thymidine incorporation. Mitogenesis depended on the direct interaction of the B subunit with GM1 on the surface of the cells. This demonstrates that endogenous plasma membrane gangliosides can mediate proliferation in lymphocytes.     

Effects of long-term reserpine treatment on brain tyrosine hydroxylase and behavioral activity

Treatment of rats with reserpine (for 8 or 9 days) produced a temporally related increase in behavioral activity and in tyrosine hydroxylase activity in the midbrain. Weight loss resulting from such treatment was not sufficient, by itself, to account for either the behavioral or enzymatic changes. The results support the role of catecholamines in behavioral arousal.     

Spontaneous whole brain slow potential changes during recovery from experimental neurosurgery

Prolonged, nonlocalized brain slow potential changes, frequently associated with cortical spreading depression, occur spontaneously during 5 days following brain implant surgery in rats. These potentials are accompanied by reductions in multiple nerve cell activity and reductions in behavioral motility. The method used in this study provides a tool for evaluating recovery from neurosurgical trauma or other brain injuries, and for testing procedures that facilitate or impede this process.     

Separation of cellular from extracellular controls of drinking in rats by frontal brain damage

Rats that had undergone removal of the frontal portion of the brain, including the olfactory bulbs, did not drink, or drank less than controls, when subjected to cellular dehydration. These same animals drank normally in response to extracellular volume reduction. Rats from which only the olfactory bulbs had been removed drank normally in both tests. An essential part of the neurological system mediating drinking produced by cellular dehydration, but not by volume reduction, therefore lies within the frontal cortex or immediate subcortical tissue.     

74例肺癌脑转移放化疗的临床观察

目的:探讨放化疗对肺癌脑转移患者的治疗效果.方法:74例肺癌脑转移患者随机分为单放组(36例)和放化组(38例),所有患者均接受放射治疗,其中放化组38例同时配合化疗.结果:放化组与单放组的1年及2年生存率比分别为40.0%(14/35):6.5%(2/31)及5.7%(2/35):0(0/31),组在1年及2年生存率行统计学比较差异有显著性(P<0.05),但在近期疗效上差异无显著性(P＞0.05).结论:化疗配合放疗能显著提高肺癌脑转移患者的生存期.