人泪腺腺样囊性癌细胞系裸鼠异种种植的研究

目的 探讨人泪腺腺样囊性癌（LACC）细胞系裸鼠异种种植模型的建立及荷瘤的组织生物学行为.方法 实验研究.将人LACC细胞系接种于10只裸鼠腋下的皮下,注射细胞悬液后每天观察裸鼠以及测量裸鼠荷瘤的最长径L和最短径W,并用公式V（荷瘤体积）=（LxW2）/2计算出荷瘤的体积.分别于注射细胞悬液后14、28、35、42、49 d随机取2只裸鼠的荷瘤以及裸鼠的肝脏、肺和腋下淋巴结.对注射细胞后14 d的荷瘤行透射电镜观察,对注射细胞后14、28、35、42、49 d的荷瘤行HE染色、免疫组织化学染色检测Keratin、Vimentin、α-SMA、S-100、Desmin的表达以及提取其总RNA,用RT-PCR检测该荷瘤的人类β-actin的表达情况.对所取的裸鼠肝脏、肺和腋下淋巴结组织切片,行HE染色,观察有无肿瘤转移.结果 接种细胞系后7d,10只裸鼠腋下皮下全部长出荷瘤.HE染色和透射电子显微镜下观察,荷瘤具有典型的上皮性肿瘤组织结构.对荷瘤行免疫组织化学染色示Keratin、Vimentin、α-SMA、S-100阳性,Desmin阴性.RT-PCR检测荷瘤表达人类β-actin基因.光镜下观察,均未发现肿瘤转移至裸鼠肝脏、肺和腋下淋巴结.结论 人LACC细胞具有一般恶性肿瘤的特点,同时也具有腺样囊性癌细胞的特点.荷瘤具有与原瘤一致的组织学特性,该动物模型易复制,时间短,成功率高,是研究LACC的良好模型.

胆囊癌细胞系GBC-SD的生物学行为研究

目的：建立人体胆囊癌细胞系，研究胆囊癌细胞的生物学行为。方法：应用组织块法建立细胞系，通过细胞形态学、增殖动力学、染色体分析、细胞上清液ＣＥＡ、ＣＡ１９－９检测及异种种植等对其生物行为进行研究。结果：ＧＢＣ－ＳＤ细胞以方形、多角形和梭形为主，倍增时间约２１．４ｈ，染色体３７～１４５条，众数８１条，具维持分泌ＣＥＡ、ＣＡ１９－９的功能，裸鼠种植肿瘤与来源肿瘤组织类型相似。结论：ＧＢＣ－ＳＤ是一新的人体胆囊癌细胞系，可作为研究胆囊癌的实验模型。

补体膜辅蛋白的研究进展

补体膜辅蛋白是分子质量为 4 5 0 0 0～ 70 0 0 0u的单链穿膜糖蛋白 ,为补体活化调节基因家族的成员之一。补体膜辅蛋白的细胞分布广泛 ,但不同类型的细胞表达的数量有所不同。现已用探针从cDNA文库中获得其cDNA克隆片断并测序 ,基因组结构已确定。补体膜辅蛋白的主要功能是辅助Ⅰ因子降解C3b和C4b ,它和其它补体成员一起有效控制补体活化 ,保护宿主细胞免受补体介导的杀伤。此外 ,补体膜辅蛋白还可作为麻疹病毒受体 ,在生殖免疫。

可移植人髓母细胞瘤PUMC-MBT1瘤株的建立与鉴定

目的建立细胞系来源的异种种植肿瘤(CDX)体内可连续稳定传代的人髓母细胞瘤研究模型,并分析其生长和形态特点、病理特征。方法采用自建人髓母细胞瘤细胞系(PUMC-MB1)移植于SCID小鼠右侧腋窝,接种细胞数为5×10^(6)个/只。当细胞系来源的异种种植肿瘤(CDX)长径增长至1.5 cm时处死小鼠,收集肿瘤组织并进行体内传代操作,重复传代10次,于第10代时观察肿瘤生长特点及荷瘤小鼠的生存时间,收集肿瘤进行病理分析。结果CDX来源的人髓母细胞瘤瘤株已在体内连续传代至10代(命名为PUMC-MBT1),成瘤率为100%,在接种第14天左右可触及皮下结节,第29天移植瘤长径达到1.5 cm左右,荷瘤小鼠平均寿命50 d。病理学检查结果显示移植瘤为经典型髓母细胞瘤,Ki-67阳性(80%~90%),Syn阳性(40%~50%),NeuN阳性(20%~30%)。结论本课题组成功建立了人髓母细胞瘤移植瘤瘤株PUMC-MBT1,造模简单便捷,成瘤率高,病理学性质稳定,保持了经典型髓母细胞瘤的特性,为髓母细胞瘤研究提供了更多的体内研究模型。

A comparative assessment on regeneration status of indigenous woody plants in Eucalyptus grandis plantation and adjacent natural forest

Diversity, density and species composition of naturally regenerated woody plants under Eucalyptus grandis plantation and the adjacent natural forest were investigated and compared. Twenty plots, with an area of 20 m × 20 m for each, were established in both of E. grand＆ plantation and adjacent natural forest, independently. In each plot, species name, abundance, diameter and height were recorded. Numbers of seedling were collected in five sub-plots （4 m2） within each major plot. A total of 46 species in the plantation, and 52 species in the natural forest, which belongs to 36 families were recorded. The diversity of species （H＇） is 2.19 in the plantation and 2.74 in the natural forest. The density of understory woody plant was 3842 stems/ha in the plantation and 4122 stems/ha in the natural forest. The densities of seedlings in the natural forest and the plantation were 8101 stems/ha and 4151 stems/ha, respectively. High similarity of woody species composition was found between the natural forest and the plantation. The E. grand＆ plantation was found favoring the regeneration and growth of Millitiaferruginia and Coffea arabica in a much better way than other underneath woody species.

A Study on Planting Adaptability of Various Soybean Varieties in Hengyang

By comparing and analyzing the growth period,agronomic traits and yield results of the four exotic soybean varieties planted in Hengyang from 2017 to 2018,it is concluded that the growth period of the four varieties in Hengyang is 92.5~95.5 d which belong to mid-mature varieties and is not much different from the original places’growth period.The yield and agronomic traits of Gandou 10 is the highest among the four varieties.The average yield of Gandou 10 is 2833.5 kg/hm2 with an increase of 10.7%compared to the local main variety Xiangchundou 24,and an increase of 9.6%compared to the original place Nanchang,Jiangxi Province.The number of effective pods per plant,grain number per plant,grain weight per plant,and 100-grain weight of Gandou 10 are higher than that of Nanchang,Jiangxi Province.

Explaining variation in productivity requires intraspecific variability in plant height among communities

While recent studies have shown the importance of intraspecific trait variation in the processes of community assembly,we still know little about the contributions of intraspecific trait variability to ecosystem functions.Here,we conducted a functional group removal experiment in an alpine meadow in Qinghai-Tibetan Plateau over 4 years to investigate the relative importance of inter-and intraspecific variability in plant height for productivity.We split total variability in plant height within each of 75 manipulated communities into interspecific variability(TV_(inter))and intraspecific variability within a community(ITV_(within)).Community-weighted mean height among communities was decomposed into fixed community-weighted mean(CWM_(fixed))and intraspecific variability among communities(ITV_(among)).We constructed a series of generalized additive mixed models and piecewise structural equation modeling to determine how trait variability(i.e.TV_(inter),ITV_(within),CWM_(fixed) and ITV_(among))indirectly mediated the changes in productivity in response to functional group removal.Community productivity was not only affected directly by treatment manipulations,but also increased with both inter-and intraspecific variability(i.e.CWM_(fixed) and ITV_(among))in plant height indirectly.This suggests that both the‘selection effect’and a‘shade-avoidance syndrome’can incur higher CWM_(fixed) and ITV_(among),and may simultaneously operate to regulate productivity.Our findings provide new evidence that,besides interspecific variability,intraspecific trait variability in plant height also plays a role in maintaining net primary productivity.