小鼠母源因子对早期胚胎发育的影响

在脊椎动物中发育过程中,卵母细胞要经历MII期停滞、受精、早期胚胎发育的启动、胚胎基因组的转录激活、并指导完成个体的发育过程。同时,核移植过程中,分化的细胞核在去核的卵母细胞中能够重编程到胚胎早期的状态并能完成个体的发育过程。在这些发育过程中母源因子都发挥了极其的重要作用。在小鼠胚胎发育研究中发现,小鼠的基因组激活发生在2细胞期,这一时期标志着合子的发育由卵母细胞控制向胚胎控制的过渡,期间发生一系列复杂的生化过程。体外培养的小鼠的胚胎的发育阻断也易发生的2细胞时期。因此对卵母细胞及早期胚胎母源因子的研究,将有利于了解早期体外培养胚胎和克隆胚胎发育失败的原因,为提高体外培养和克隆胚胎发育的成功率提供理论的基础。     

Substance P enhances the proliferation of rat anterior pituitary cells in vitro

The undecapeptide substanceP(SP) was shown to be intimately involved in both the structural and functional aspects of the anterior pituitary.Yet,in addition to its influences on hormonal secretion,SP may well possess more actions in this master gland.The present study was ftherefore aimed to investigate the effect of SP on the proliferation of rat anterior pituitary cells in primary culture,It was found that SP could dose-dependently increase the incorporation of tritiated thymidine(3H-TdR) into cultured anterior pituitary cells.Other mammalian tachykinins such as neurokinin A and neurokinin B had similar effect but to varying degrees.The equipotent analogue of SP,Norleucine^11-SP(Nle^11-SP),also acted likewise.with its action antagonizable by spantide,a SP receptor blocker.To further characterize the nature of cells responsive to the challenge of SP,immunocytochemical staining against S-100 protein and some adenohypophyseal hormones was performed alone or plus autoradiography.The results showed that the percentage of S-100 proteinimmunorective cells was apparently elevated by the addtion of Nle^11-Sp for 48h,which indicates a preferential proliferation of folliculo-stellate cells under the regime .This was confirmed by increases in immunocytochemical or autoradiographical labelling indices of anterior pituitary Substance P and anterior pituitary cell proliferation.Cells treated similarly.Taken together,These results reveal that the trophic action of SP observed previously in other tissues is also present at least in cultured rat anterior pituitary cells.with responding cells being predominantly folliculo-stellate cells as typified by S-100 proteinimmunoreactivity.Therefore,an intra-pituitary trophicaction of SP in vivo could be anticipated.     

湘西土家族、苗族红细胞血型的分布

对湖南吉首市的中学生进行了红细胞备型分布调查。土家族200人的各表型人数是：O 57,A 74,B 45,AB 24;M 75,MN 88,N 37;CCDee 84,CCDE 26,DcDee 26,CcDE 47,ccDee 1,ccDE 14,Ccdee 1,CcdE 1;P1(+)103,P1(-)97。苗族202人的各表型人数是：O 74,A 65,B 54,AB 9;M 75,MN 101,N 26;CCDee 78,CCDE 2,CcDee 42,CcDe 58,ccDee 2,ccDE 20;P1(+)65,P1(-)138;Fy(a+b-)199。Fy(a+b+)1,Fy(a-b+)2。 The distribution of several red cell blood group systems was studied in Tujia and Miao ethnic groups in Jishou City,Hunan Province.The phenotype distribution of 200 unrelated Tujias was:O 57,A 74,B 45,AB 24;M 75,MN 88,N 37;CCDee 84,CCDE 26,DcDee 26,CcDE 47,ccDee 1,ccDE 14,Ccdee 1,CcdE1;P1(+)103,P1(-)97。     

母女猫叫综合征患者的遗传分析

猫叫综合征患者不仅可以活到成年, 而且可有生育能力,可将缺失染色体直接传给其子女使其患同样的疾病。早产是该综合征重要临床表现之一。     

邯郸地区155000人群的遗传流行病学调查

邯郸地区１５５０００人群的遗传流行病学调查任新鸾（河北省邯郸医学高等专科学校,邯郸０５６０２９）赵美英吕丽英张风梅赵丽萍（河北省邯郸县妇幼保健站,邯郸０５６０００）ＴｈｅＥｐｉｄｅｍｉｏｌｏｇｙＳｕｒｖｅｙｏｆＩｎｈｅｒｉｔａｎｃｅＤｉｓｅａｓｅｏｆ...     

TBP的联结因子TAFs的结构与功能

ＴＢＰ的联结因子ＴＡＦｓ的结构与功能潘建伟赵章杏朱睦元（杭州大学生命科学学院,杭州３１００１２）潘伟槐黄承才（绍兴文理学院生化系,绍兴３１２００）ＳｔｒｕｃｔｕｒｅｓａｎｄＦｕｎｃｔｉｏｎｓｏｆＴＢＰ－ａｓｏｃｉａｔｅｄＦａｃｔｏｒｓＴＡＦｓＰＡＮＪ...     

Molecular characterization and functional expression of opioid receptor-libe_1 receptor

INTRODUCTIONOpioidactsinthecentralandperipheralnervoussystem(CNSandPNS)to'producenumerouspharmacologicaleffects.Repetitiveorcontinuoususeofopioids,however,causesdrugtoleranceanddependence.Threesubtypesofopioidreceptors,termedp)6,andK,havebeencloned.TheyarecoupledtotheinhibitoryGproteinandnegativelyregulateadenylylcyclasell].RecentlyanewG-proteincoupledreceptortermedopioidreceptor-likereceptor(ORLI)whichbelongstothenewlycharacterizedopioidreceptorsubfamilyhadbeenclonedfromhumanbrainst…     

DNA Polymorphism Among Yewei B, V20B, and Oryza minuta J. S. Presl. ex C. B. Presl

The new cytoplasmic male sterile （CMS） line Yewei A and its maintainer line Yewei B, with better agronomic characteristics, have been developed from a mutant of V20B （a rice maintainer line） through transformation of genomic DNA of wild rice （Oryza minuta J. S. Presl. ex C. B. Presl.）. Analysis of molecular markers, DNA sequences, and Southern blot revealed that high DNA polymorphism exists between the mutant and its receptor, indicating that the special DNA fragment from O. minuta may be integrated into the genome of Yewei B. Therefore, transformation of genomic DNA from distant relatives to the plant of a target receptor may open an avenue for creating a new rice germplasm.     

Roles of HIV-1 auxiliary proteins in viral pathogenesis and host-pathogen interactions

INTRODUCTION In addition to the prototypical retroviral Gag, Pol, and Env proteins, HIV-1 produces six additional proteins, i.e., Tat, Rev, Nef, Vif, Vpr and Vpu (Fig. 1, adapted from [1]). While Tat and Rev are required for viral replication, Nef, Vif, V…     

An editorial overview: HIV/AIDS in China

China has come a long way in fighting against its HIV/AIDS epidemic. The Chinese government has taken an active role in combating this detrimental disease and such a welcome attitude by the Chinese government will certainly provide a positive spin on its …