药用肠溶性丙烯酸树脂的合成研究

以甲基丙烯酸与甲基丙烯酸甲酯为原料,过硫酸钾为引发剂,经溶液聚合制备出药用肠溶性丙烯酸树脂。考察了物料配比、反应温度、溶剂浓度、引发剂用量对反应的影响。     

自体肝癌细胞裂解物致敏的树突状细胞诱导抗肝癌免疫的体外研究

从术后肝癌病人的外周血中诱导树突状细胞（DC），并经自体肝癌细胞裂解物致敏DC，用流式细胞仪、^3H-TdR掺入法及MTT法检测了DC表面分子的表达、DC刺激T细胞的增殖效应及DC诱导的T细胞对肝癌细胞的杀伤作用，进而比较经自体肝癌细胞裂解物致敏的DC与其它条件下的DC功能的差异．结果显示：肝癌细胞裂解物致敏DC的功能较未致敏DC显著提高，其可诱导自体混合淋巴细胞强的增殖效应，同时诱导的T细胞对自体肝癌细胞有较强的杀伤率．     

The enteric neural receptor for 5-hydroxytryptamine

Summary An enteric neural receptor for serotonin (5-HT) has been characterized. This receptor was assayed, using³H-5-HT as a radiologand, by rapid filtration of isolated enteric membranes and by radioautography. In addition, intracellular recordings were made from ganglion cells of the myenteric plexus. High affinity, saturable, reversible, and specific binding of³H-5-HT was demonstrated both to membranes of the dissected longitudinal muscle with adherent myenteric plexus and the mucosa-submucosa. Radioautographs showed these³H-5-HT binding sites to be in myenteric ganglia and in a broad unresolved band at the mucosal-submucosal interface. Antagonists active at receptors for other neurotransmitters than 5-HT, at either of the two known types of CNS 5-HT receptor, and at 5-HT uptake sites on serotonergic neurons failed to inhibit binding of³H-5-HT. The structural requirements of analogues for binding to the enteric 5-HT receptor matched the known pharmacology of M or neural 5-HT receptors. A novel 5-HT antagonist was found. This compound, N-acetyl-5-hydroxytryptophyl-5-hydroxytryptophan amide (5-HTP-DP), antagonized the action of 5-HT on type II/AH cells of the myenteric plexus but did not affect the release or actions of acetylcholine (nicotinic or muscarinic) or substance P. 5-HTP-DP was also an equally potent displacer of³H-5-HT from its binding sites on enteric membranes. It is concluded that the sites responsible for specific binding of³H-5-HT are enteric M or neural 5-HT receptors. These receptors differ from those now known to be present in the CNS.     

Neuropeptides and the microcircuitry of the enteric nervous system

Summary The discovery of neuropeptides in enteric neurons has revolutionized the study of the microcircuitry of the enteric nervous system. Form immunohistochemistry, it is now clear that some individual enteric neurons contain several different neuropeptides with or without other transmitter-specific markers and that these markers occur in various combinations. There is evidence from experiments in which nerve pathways are interrupted that populations of enteric neurons with different combinations of markers have different projection patterns, sending their processes to distinct targets using different routes. Correlations between the neurochemistry of enteric neurons and the types of synaptic inputs they receive are also beginning to emerge from electrophysiological studies. These findings imply that enteric neurons are chemically coded by the combinations of peptides and other transmitter-related substances they contain and that the coding of each population correlates with its role in the neuronal pathways that control gastrointestinal function.     

肉毒毒素肠溶微球灭鼠剂的制备及性质研究

以肉毒毒素作为主体灭鼠药物,用丙烯酸树脂Ⅱ号为肠溶材料,通过相分离法制备肠溶微球;考察了微球的形态特征、包封率、载体回收率、抗酸能力、体外溶出度以及包封蛋白的活性保留度,并经拌饵投食试验,表明该制剂能有效地提高毒蛋白在肠胃中的稳定性,使其毒力(LD50)提高100倍以上,并且有较强的缓释作用．     

鲎试剂方法检测胎盘多肽注射液中细菌内毒素

考察采用鲎试剂方法检测胎盘多肽注射液中细菌内毒素的可行性.参照中国药典2010年版(二部)附录ⅪE细菌内毒素检查法,选择两个厂家生产的鲎试剂(灵敏度为0.5 EU/mL),对不同稀释倍数的胎盘多肽注射液供试品溶液进行细菌内毒素与鲎试剂之间凝集反应的干扰试验.结果显示胎盘多肽注射液经40倍稀释后对鲎试剂与细菌内毒素之间的...     

注射用甲硫氨酸维生素B1的细菌内毒素检查

为考察注射用甲硫氨酸维生素B1的细菌内毒素检查法的可行性，采用《中华人民共和国药典》（2005年版）细菌内毒素检查法。结果得知，注射用甲硫氨酸维生素B1质量浓度为0．25mg／mL的稀释液可用灵敏度为0．25EU／mL的鲎试剂进行细菌内毒素检查，实验中3个批号的注射用甲硫氨酸维生素B1经检查均符合规定。     

Tachykinins and their functions in the gastrointestinal tract

In the gastrointestinal tract, tachykinins are peptide neurotransmitters in nerve circuits that regulate intestinal motility, secretion, and vascular functions. Tachykinins also contribute to transmission from spinal afferents that innervate the gastrointestinal tract and have roles in the responses of the intestine to inflammation. Tachykinins coexist with acetylcholine, the primary transmitter of excitatory neurons innervating the muscle, and act as a co-neurotransmitter of excitatory neurons. Excitatory transmission is mediated through NK1 receptors (primarily on interstitial cells of Cajal) and NK2 receptors on the muscle. Tachykinins participate in slow excitatory transmission at neuro-neuronal synapses, through NK1 and NK3 receptors, in both ascending and descending pathways affecting motility. Activation of receptors (NK1 and NK2) on the epithelium causes fluid secretion. Tachykinin receptors on immune cells are activated during inflammation of the gut. Finally, tachykinins are released from the central terminals of gastrointestinal afferent neurons in the spinal cord, particularly in nociceptive pathways. Received 24 March 2007; received after revision 30 August 2007; accepted 14 September 2007     

高产奶牛与低产奶牛血浆内毒素含量差异比较

选取健康奶牛10头,按胎次、年龄相同或相似的原则,分为高产奶量组和低产奶量组.两组日粮组成相同,同一时间采集血液,测定血浆内毒素含量,进行对比.结果表明,高产组奶牛血浆内毒素极显著高于低产组奶牛;高产组奶牛更容易发生由于血浆内毒素过高所引起的各种疾病,使高产奶牛产奶寿命降低.     

不同裂解液对血管蛋白提取和磷酸化蛋白免疫印迹的影响

为寻找一种适合血管组织蛋白提取的裂解液配方以及用于磷酸化蛋白的免疫印迹分析,运用3种不同的细胞裂解液A,B和C,分别对经预处理的等量猪冠状动脉血管样品进行总蛋白的提取,BCA法测蛋白含量,聚丙烯酰胺凝胶电泳(SDS-PAGE)对蛋白进行分离,免疫印迹法检测pERK,p-AKT,p-MLC和p-MYPT1 4种磷酸化蛋白表达以比较3种裂解液的裂解效果.结果表明,3种裂解液均可以满足一般免疫印迹分析的要求,其中C液提取的蛋白浓度最低,B液提取的蛋白含量最高,但不适于低含量的小分子磷酸化蛋白p-MLC的检测,A液用于免疫印迹检测大、中、小3种分子量的磷酸化蛋白效果最佳.即细胞裂解液A(50mmol·L-1 pH 7.4Tris-HCl,150mmol·L-1 NaCl,0.1%SDS,1%NP-40,1mmol·L-1 EDTA,1mmol·L-1 EGTA,临用前加入蛋白酶抑制剂和磷酸酶抑制剂)可作为提取血管组织总蛋白进一步用于Western检测的一种理想配方.