Identification of feline blood B and T lymphocytes by cell electrophoresis.

The electrokinetic properties of feline blood lymphocytes isolated by centrifugation over Ficoll-Isopaque gradient were investigated. A biphasic electrophoretic mobility (EPM) distribution was regularly observed with a low-mobility (LM) population (mean EPM: 0.82) accounting for 32% of blood lymphocytes and a high-mobility (HM) population (mean EPM: 1.09) representing 68% of blood lymphocytes. Following fractionation on nylon-wool columns, lymphocytes with B-cell properties (64% sIg⁺; 9% guinea pig erythrocytes (GPE)-rosette⁺, PHA and Con A unresponsive) were enriched in the adherent fraction and belonged mainly (78%) to the LM population. In contrast, lymphocytes with T properties (5% sIg⁺, 42% GPE-rosette⁺, PHA and Con A responsive) were recovered in the effluent fraction and comprised 84% of HM elements.Thus, in cat blood, LM lymphocytes are likely to represent in majority B cells and HM lymphocytes T cells. This indicates that cell electrophoresis provides an interesting mean for differentiating B and T cells in the cat.     

Diagnosis of Equine Protozoal Myeloencephalitis Using Indirect Fluorescent Antibody Testing and Enzyme-Linked Immunosorbent Assay Titer Ratios for Sarcocystis neurona and Neospora hughesi

The aim of this study was to compare two serologic tests used to support a diagnosis of equine protozoal myeloencephalitis (EPM). Serum and cerebrospinal fluid (CSF) samples were analyzed for antibodies to Sarcocystis neurona and Neospora hughesi by indirect fluorescent antibody testing (IFAT) and surface antigens of S. neurona and N. hughesi by enzyme-linked immunosorbent assay (ELISA). The samples originated from neurologic horses with confirmed and suspected EPM (nine S. neurona, three N. hughesi), from neurologic horses with confirmed neurologic diseases other than EPM (16 horses) and from healthy horses (10). The IFAT on CSF and ELISA titer ratios showed equal sensitivity in diagnosing EPM caused by S. neurona. The ELISA titer ratios showed slightly greater specificity in diagnosing EPM than the IFAT on CSF. Overall agreement between the IFAT on CSF and ELISA titer ratio was 90.9%. The IFAT on CSF and ELISA serum/CSF ratio are indicated to help support a laboratory diagnosis of EPM.     

海洋珍珠生物提取液对人宫颈癌Caski细胞增殖与凋亡作用的影响

[目的]探讨海洋珍珠生物提取液对宫颈癌Caski细胞株增殖和凋亡的影响。[方法]MTT法检测细胞增殖情况;流式细胞仪采用AnnexinV和PI双染检测细胞的凋亡率,PI单染法测定细胞周期;Hoechst33258/PI荧光染色法观测Caski细胞的形态学改变;RT-PCR法测定宫颈癌Caski细胞株内Bcl-2和Bax基因表达。[结果]海洋珍珠生物提取液在一定浓度范围内,以浓度依赖性和时间依赖性的方式抑制宫颈癌Caski细胞的生长（P〈0.05）.以0、6、30和60μg/ml海洋珍珠生物提取液处理细胞24h,Caski细胞早期凋亡率分别为7.6%,7.15%,18.5%和38.9%,晚期凋亡比例为0.45%、2.85%、8.55%和23.2%。荧光显微镜下细胞呈现典型的凋亡性改变;RT-PCR显示海洋珍珠生物提取液处理后宫颈癌Caski细胞内的Bcl-2mRNA表达降低,BaxmRNA表达升高。[结论]海洋珍珠生物提取液以浓度依赖性和时间依赖性的方式抑制宫颈癌Caski细胞增殖,并通过降低Bcl-2,升高BaxmRNA来诱导细胞凋亡。     

中国人工林害虫生态治理策略及技术展望

针对中国人工林虫害发生现状，分别从林分组成、系统结构、经营管理措施、气候因素以及防治技术等5个方面细致分析了引发虫害的原因；讨论了害虫综合治理的概念、特点及局限性，阐述了害虫生态治理的内涵及其与害虫综合治理的关系，结合我国人工林的特点，提出了害虫生态治理的控制策略；并对在此策略下实施的防治技术进行了展望。     

Seroprevalence of Sarcocystis neurona and Its Association With Neurologic Disorders in Argentinean Horses

Equine protozoal myeloencephalitis (EPM) is generally caused by Sarcocystis neurona and can produce substantial economic losses on equine production in America. The aims of the present study were to evaluate the seroprevalence of S. neurona in the main horse-production area of Argentina and associate it with the occurrence of neurologic disorders. Serum samples were collected from 640 horses in nine Argentinean provinces. Most of the samples correspond to animals ≥1.5-year-old from different breeds (n = 628); 12 samples were from younger horses. Further seroprevalence comparison was conducted from the older animals grouped with (n = 148) or without neurologic signs (n = 480). Immunoblot: proteins from 2 × 10⁷S. neurona merozoites were used as antigen on each membrane. Reactivity to antigens with relative mobility of 7, 10, and 16 kDa was considered specific for antibodies against S. neurona; reactivity at 30 kDa was recorded separately. The overall seroprevalence for S. neurona was 26.1% (167/640), and all the provinces had positive horses. Seroprevalence of animals with neurologic signs was greater (P < .001) than what was observed in normal horses (39.2% vs. 22.1%), with an odds ratio of 2.27. Reactivity at 30 kDa was detected in 71% of all samples. This study identified a wide distribution of S. neurona–positive animals in Argentina and horses with neurologic signs having a greater seroprevalence than normal horses. Sarcocystis neurona infection should be considered for early differential diagnosis and treatment of animals with neurologic disorders to decrease the economic impact of EPM in Argentina.