目的为获得一种适于本地结核病临床诊断用抗原,将结核分枝杆菌38×103抗原——即磷酸盐传送蛋白1(phosphate transport system protein l,PstS1)和尿蛋白1(urine protein1,U1)进行融合表达、纯化并测定其抗原活性。方法用基因拼接...
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目的为获得一种适于本地结核病临床诊断用抗原,将结核分枝杆菌38×103抗原——即磷酸盐传送蛋白1(phosphate transport system protein l,PstS1)和尿蛋白1(urine protein1,U1)进行融合表达、纯化并测定其抗原活性。方法用基因拼接法将结核分枝杆菌编码PstS1和U1蛋白的基因拼接在一起,克隆到原核表达载体pET28a中,通过IPTG诱导实现其高效表达,采用亲和层析纯化表达产物。用纯化的融合抗原免疫家兔获得抗血清,用该血清以及活动性肺结核患者血清对纯化产物的抗原活性进行测定。结果成功构建了原核表达质粒,对表达产物进行亲和层析纯化,获得相对分子质量为57×103的目的蛋白。经Western blot检测融合抗原能够与活动性肺结核患者血清中的抗体发生结合。结论本研究表达并纯化出PstS1-U1融合抗原,为进一步的应用奠定基础。
Objective To establish an artificial somatic-autonomic reflex arc in rats and observe the following distributive changes of neural fibers in the bladder. Methods Adult Sprague-Dawley rats were randomly divided into th...
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Objective To establish an artificial somatic-autonomic reflex arc in rats and observe the following distributive changes of neural fibers in the bladder. Methods Adult Sprague-Dawley rats were randomly divided into three groups： control group, spinal cord injury （SCI） group, and reinnervation group. DiI retrograde tracing was used to verify establishment of the model and to investigate the transport function of the regenerated efferent axons in the new reflex arc. Choline acetyltransferase （CHAT） in the DiI-labeled neurons was detected by immunohistochemistry. Distribution of neural fibers in the bladder was observed by acetylcholine esterase staining. Results DR-labeled neurons distributed mainly in the left ventral horn from L3 to L5, and some of them were also CHAT-positive. The neural fibers in the bladder detrusor reduced remarkably in the SCI group compared with the control （P 〈 0.05）. After establishment of the somatic-autonomic reflex arc in the reinnervation group, the number of ipsilateral fibers in the bladder increased markedly compared with the SCI group （P 〈 0.05）, though still much less than that in the control （P 〈 0.05）. Conclusion The efferent branches of the somatic nerves may grow and replace the parasympathetic preganglionic axons through axonal regeneration. Acetylcholine is still the major neurotransmitter of the new reflex arc. The controllability of detrusor may be promoted when it is reinnervated by the pelvic ganglia efferent somatic motor fibers from the postganglionic axons.
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