Altered activation/detoxication enzymology following neonatal diethylstilbestrol treatment

The effects of neonatal exposure to diethylstilbestrol (DES) on hepatic activation/detoxication enzyme levels in the adult rat were investigated. Neonatal exposure of male rats to DES (DES males) decreased the endogenous levels of UDP-glucuronyltransferase as compared to control males. Female rats exposed neonatally to DES (DES females) had higher endogenous epoxide hydrolase and glutathione transferase activity levels than control females. Adult animals treated neonatally with DES also had altered metabolic potential following exposure to 3-methylcholanthrene and phenobarbital. The DES males treated in adulthood with 3-methylcholanthrene had higher benzo(a)pyrene hydroxylase activities and lower UDP-glucuronyltransferase activity levels than did control males treated in adulthood with 3-methylcholanthrene. The DES males exposed in adulthood to phenobarbital had reduced cytochrome P-450 and glutathione transferase activity levels as compared with respective controls. The DES females treated in adulthood with 3-methylcholanthrene had lower benzo(a)pyrene hydroxylase and epoxide hydrolase activity levels than control females receiving 3-methylcholanthrene. The DES females challenged in adulthood with phenobarbital also had decreased benzo(a)pyrene hydroxylase, epoxide hydrolase, UDP- glucuronyltransferase, and glutathione transferase activity levels as compared with respective controls. Our results demonstrated that neonatal exposure to DES changed the endogenous levels of specific hepatic enzymes and altered the metabolic response of these adult animals to a carcinogen and a drug.     

鸡输卵管上皮细胞体外分离培养的研究

鸡输卵管上皮细胞是卵清蛋白的主要分泌细胞,是研究输卵管特异表达蛋白调控的重要工具。在以往的研究中,多采用普通DMEM培养液对鸡输卵管上皮细胞进行分离与培养,容易造成其自身特性在体外培养过程中的改变。本研究我们优化了细胞分离方法,发现从输卵管漏斗部组织分离的输卵管上皮细胞增殖较快;用鸡输卵管上皮细胞培养基相比DMEM更适合促进细胞生长;与胰酶相比,用Accutase消化酶进行细胞传代,有利于输卵管上皮细胞特性维持。对所获得的输卵管上皮细胞鉴定发现,己烯雌酚能促进卵清蛋白的表达,说明分离培养的细胞保持了鸡输卵管上皮细胞特性。本研究建立的方法为输卵管特异表达蛋白调控以及家禽生物反应器的研究奠定了基础。     

LIPOSOME RECOGNITION BY RESIDENT AND NEWLY RECRUITED MURINE LIVER MACROPHAGES

ABSTRACT

The evidence in this communication indicate that, unlike resident Kupffer cells, newly recruited liver macrophages (following monocyte migration from the blood to the liver) use complement receptors to recognize and internalize stearylamine-incorporated liposomes. Within two weeks of hepatic residency complement receptors no longer participate in liposome recognition and uptake.