人白血病细胞裸鼠异种移植模型的建立

我们成功地将人T淋巴细胞白血病细胞（MOLT－4）、人早幼粒细胞白血病细胞（HL-60）移植到裸鼠体内。裸鼠经环磷酰胺（2.5mg／只）预处理后分别将（5～10）×10~6MOLT-4细胞及（2～4）×10~7HL－60细胞移植到动物皮下能形成实体瘤，该肿瘤呈进行性生长。MOLT－肿瘤在裸鼠间连续传代4次，移植成功率为69.2％，HL-60肿瘤连续传代3次，成功率为100％。肿瘤染色体分析属于人体细胞核型，细胞学研究显示裸鼠体内MOLT-4、HL-60细胞与体外培养的细胞具有良好的一致性，故裸鼠体内MOLT-4、HL-60肿瘤模型的建立对于研究人白血病提供了有用工具。     

胃癌单克隆抗体在裸鼠移植瘤中的免疫定位和显像

本文采用Ｉｏｄｏｇｅｎ法将鼠抗人胃癌单克隆抗体ＲＳＦ９（ＩｇＭ）予以１３１Ｉ标记，研究ＲＳＦ９在荷人胃癌裸鼠中的定位和显像能力。结果表明，ＲＳＦ９在体内能特异性地与肿瘤组织结合，Ｔ／ＮＴ比值随时间延长逐渐升高，９６ｈＴ／ＮＴ比值均大于２．５，瘤／血比值为２．６９，肿瘤定位指数达５．１８，ＳＰＥＣＴ得到清晰的肿瘤图像。ＲＳＦ９具有良好的体内导向定位能力。ＩｇＭ型单抗也可用于肿瘤显像。     

小剂量氯化汞对小鼠脂质过氧化物的影响

本观察小剂量１ｍｇ／ｋｇ）ＨｇＣｌ２对小鼠肝，脑组织中脂质过氧化物（ＬＰＯ）的影响，发现小剂量ＨｇＣｌ２可使肝组织中ＬＰＯ含量明显增高，与对照组比，差异有显性（Ｐ〈０．０２５），而脑组织中ＬＰＯ含量未见明显影响（Ｐ〉０．０５）。     

人基因工程重组超氧化物歧化酶对骨髓造血干细胞的辐射防护作用

用照射小鼠的骨髓造血干细胞(CFU-S)外源性脾结节形成法,评价人基因工程重组SOD(rhSOD),聚乙二醇(PEG)修饰的长半衰期重组SOD(PEG-SOD)对CFU-S的辐射防护作用.结果显示:rhSOD和PEG-SOD均能明显提高CFU-S产率,其中rh SOD在照射前1h给药效果好,而PEG-SOD在照射前2～3h给药作用更为明显,化学修饰后SOD血浆半衰期延长,将使给药时机及药物作用持续时间得到改善.     

褪黑素和哌替啶对小鼠的镇痛作用比较

利用热板法或甩尾法测定小鼠痛阈，发现褪黑素１０～４０ｍｇ·ｋｇ－１ｉｐ后６０ｍｉｎ时镇痛作用最强，１５０ｍｉｎ时仍有镇痛作用。哌替啶１０～４０ｍｇ·ｋｇ－１ｉｐ后３０ｍｉｎ时镇痛作用最强，１２０ｍｉｎ时已无镇痛作用。在６０ｍｉｎ时两者镇痛作用相近。是示两者的作用特点不同。     

重度联合免疫缺陷小鼠的繁育及其应用初报

应用带过滤罩的透明鼠在层流柜内繁育Ｔ和Ｂ淋巴细胞缺失的重度联合免疫缺陷（ｓｃｉｄ）小鼠获得成功，１９９３年５月至１９９４年４月，共繁育ｓｃｉｄ小鼠２２１只，寿命均超过１２个月。平均每窝产仔数为５．５只，显著低于对照组ＢＡＬＢ／ｃ小鼠，不育率为１４．９％，离乳率为８８．２％，与ＢＡＬＢ／ｃ小鼠相比均无明显差异。ｓｃｉｄ小鼠４～１０周龄的体重与同龄ＢＡＬＢ／ｃ小鼠相比无明显差异，微生物学检测均符合ＳＰ     

赤灵芝的致突变性试验

使用赤灵芝的水提取液、乙醇（３０％）提取液进行鼠伤寒沙门氏菌回复、小鼠骨髓多染红细胞微核和雄小鼠精子畸变等三种致突变试验。剂量为１０００μｇ．皿＾－１和５０００μｇ／皿＾－１的鼠伤寒沙门氏菌回复试验的结果为阴性。小鼠在服用７５００ｍｇ．ｋｇ＾－１的水提取液或２５００ｍｇ．ｋｇ＾－１的醇提取液时，微核试验和精子畸变试验结果均为阴性。     

The effects of norepinephrine transporter inactivation on locomotor activity in mice.

BACKGROUND: Acute administration of different classes of antidepressants can enhance or reduce spontaneous locomotor activity in a novel environment, but the effects of chronic antidepressant treatment on spontaneous locomotor activity in novel and familiar environments are less well characterized. Because norepinephrine is an important regulator of spontaneous locomotor activity, we speculated that norepinephrine transporter blockade contributes to the effects of some antidepressants on spontaneous locomotor activity. METHODS: Antidepressant drugs (reboxetine, desipramine, imipramine, venlafaxine, bupropion) were administered acutely (intraperitoneal) or chronically (via osmotic minipump) to control and norepinephrine transporter knockout mice, and spontaneous locomotor activity in novel or familiar environments was recorded. RESULTS: Acute treatment with most norepinephrine transporter-blocking antidepressants decreased spontaneous locomotor activity in a novel environment, whereas chronic treatment decreased spontaneous locomotor activity in both novel and familiar environments. The exception was bupropion, a dual norepinephrine transporter/dopamine transporter blocker, which tended to increase spontaneous locomotor activity. Coadministration of reboxetine and the dopamine transporter blocker GBR 12909 also increased spontaneous locomotor activity. Norepinephrine transporter knockout mice had low basal spontaneous locomotor activity, which was increased by bupropion, whereas reboxetine had no effect in norepinephrine transporter knockout mice. CONCLUSIONS: Acute or chronic inactivation of the norepinephrine transporter decreases spontaneous locomotor activity in novel and familiar environments unless coupled with dopamine transporter blockade.