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泥蚶大规模死亡的病原生物学及其宿主血细胞免疫特性研究
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摘要
泥蚶是重要的养殖经济贝类,但近年来泥蚶病害问题日益突出,大规模死亡频繁发生,造成较大损失。查明大规模死亡病因,加强泥蚶病害免疫预防研究,对促进泥蚶养殖业健康发展、丰富贝类免疫学理论具有重要意义。本研究采用光镜、电镜、流式细胞仪、分子生物学、细胞生物学、生物信息学等技术,对乐清湾泥蚶大规模死亡原因进行了流行病学调查,并对泥蚶血细胞免疫特性以及血淋巴中免疫相关的天冬氨酸消旋酶基因进行了研究。
     1.2005年至2009年乐清湾养殖泥蚶多次发生大量死亡。一种专性寄生于细胞内的原核微生物,在濒死和死亡的泥蚶中多次被检测到。这些原核微生物通常呈圆形、椭圆形或哑铃形;大小在0.28μm和0.71μm之间;为三层细胞膜结构;具有横二分裂和出芽两种繁殖方式。这种原核微生物能形成细胞内嗜曙红性的包涵体。这些包涵体主要分布于外套膜、鳃、消化管的上皮组织和结缔组织中。根据生物学和形态学特点,推测该原核微生物属于立克次氏体科,定名为类立克次氏体(RLO)。这种RLO表现出较强的致病性。病理学检查发现被RLO感染的细胞呈现严重的病理变化;组织的破坏程度与RLO包涵体的数量正相关;细胞病变程度与细胞内RLO数量正相关;具有相似特征的RLO及其包涵体,在不同养殖场、不同发病时间所采集的泥蚶病样中都有发现;RLO感染强度与泥蚶死亡率正相关。为此,认为RLO感染与乐清湾养殖泥蚶大量死亡有密切联系。
     2.根据细胞大小、形态结构、颗粒特点,光镜下可将泥蚶血细胞区分为红色颗粒细胞(占89.67%)、嗜碱性颗粒细胞(占7.05%)、透明细胞(占3.28%)三种主要类型。健康泥蚶血淋巴中血细胞平均密度为3.29±0.82×106cell/mL。透射电镜下观察到颗粒细胞Ⅰ型、颗粒细胞Ⅱ型、无颗粒细胞;扫描电镜观察下,细胞表面光滑,部分细胞表面有小的突起物。用流式细胞仪检测出P1(13.13%)和P2(78.83%)两个细胞亚群以及没有固定形态的细胞(近8%)。利用APIZYM试剂盒对健康泥蚶血细胞及血清中的19种酶进行检测,在血细胞中检测到11种酶,在血清中检测到了13种酶,经酵母聚糖刺激后,碱性磷酸酶、酸性磷酸酶、类脂脂酶、N-乙酰葡萄糖胺酶在血细胞和血清中水平大幅升高。体外吞噬实验揭示红色颗粒细胞对酵母聚糖具有明显的吞噬能力,嗜碱性颗粒细胞和透明细胞吞噬作用不显著;在经嗜水气单胞杆菌刺激后,嗜碱性颗粒细胞出现大量聚集现象,透明细胞能吸附颗粒物。吞噬活性研究表明,温度、盐度对泥蚶血细胞的吞噬活性有显著的影响,在泥蚶适宜生长温度(13-30℃)区间和最适盐度(20.0-26.2ppt)区间,血细胞吞噬活性达到最高值。
     3.从泥蚶血细胞中克隆出天冬氨酸消旋酶(AR)基因,泥蚶AR基因的ORF序列全长1017bp,编码338个氨基酸,预测蛋白分子量为37.1kDa,理论等电点为8.62,为碱性蛋白。序列分析发现,泥蚶氨基酸序列与魁蚶AR氨基酸序列的同源性达到93%,与海胆和海鞘的AR氨基酸序列同源性为51%和41%。聚类分析表明,泥蚶AR能与所有已报道的生物AR聚合在一起,表明成功克隆了泥蚶天冬氨酸消旋酶的基因。泥蚶AR含有5-磷酸毗哆醛(PLP)结合模序,提示其活性需要PLP的存在。AR基因在泥蚶血细胞中表达,表明AR和D型天冬氨酸可能参与泥蚶血细胞的免疫机制。
Blood clam, Tegillarca granosa, is an important economic shellfish. But diseases of blood clam have become increasingly severe issue. The mass mortalities occurred frequently in recent years and resulted in large losses. Therefore, it is very important to investigate the cause of mass mortalities and study immunological prevention for promoting the healthy development of the blood clam aquaculture. In this study, the causes of mass mortality of blood clam in the Yueqing Bay were investigated using epizoological survey methods and experimental study, and the immunological features of hemocyte cell from the blood clam were studied using light microscopy, electron microscopy, flow cytometry and enzyme technology. In addition, an aspartate racemase molecule was identified in the hemocyte cell of blood clam.
     1. A series of mass mortalities of the cultured blood clam, Tegillarca granosa, occurred in the Yueqing Bay of China from2005to2009. An obligate intracellular prokaryote, designated as rickettsia-like organisms (RLO), was frequently found in the moribund or dead blood clam sample during ultrastructural examination. These organisms were usually round, ellipsoid or occasionally dumbbell-shaped, ranged from approximately0.28to0.71μm in size and had a trilaminar cell wall. Two reproductive modes of organisms, transverse binary fission and budding, were observed. The organisms are able to form eosinophilic inclusions. Most inclusions were found within epithelial and connective tissues of the mantle, gills and digestive tube. The biological and morphological characteristics indicate that these organisms may belong to the family Rickettsiaceae. RLOs exhibited significant pathogenicity. Cytopathological examinations revealed extensive necrosis and destruction in the infected cell. The degree of tissue destruction was positively related to the number of RLO inclusions in the tissues, and the cytopathological effects were positively related to the number of intracellular RLOs. RLOs and their inclusions were discovered throughout different epizoological areas and in different periods of time. The infection intensity of the RLOs was positively correlated with the mortality rate of clams. Therefore, RLO infection might be associated with mass mortalities of cultured blood clams in the Yueqing Bay.
     2. Light, electron microscopics and flow cytometer studies were conducted to characterize morphology and structure and phagocytosis of haemocytes in blood clam Tegillarca granosa. Based on cell size, and microstructure and granular types of cell, blood clam haemocytes were divided into red granulocyte (89.67%), basophil granulocyte (7.05%) and hyalinocyte (3.28%), respectively under light microscopy. The haemocyte densities in healthy blood clam haemolymph were assessed3.29±0.82×106cell/mL. Three kinds of haemocytes were respectively recognized by transmission electron microscope:granulocyte type Ⅰ, granulocyte type Ⅱand agranulocyte. It was observed under scanning electron microscopy that haemocytes appear smooth-surface and some of them have knot-like projections in cell surface. APIZYM assays on enzymatic activities of19enzymes in haemolymph were performed and, of these,13and10enzymes were detected, respectively in serum and haemocyte cell. There were marked increases in the levels of ALP, ACP, ELIP (C8) and AGLA in serum and haemocytes after stimulated by zymosan. Observation of phagocytosis in vitro revealed that phagocytic response in red granulocyte to zymosan and there was no significant phagocytic response in basophil granulocyte and hyalinocyte. It was observed that basophilic granulocyte accumulation and hyalinocyte adsorption after stimulated by Aeromonas hydrophila. The study of environmental stress factors on phagocytosis activity revealed that the temperature and salinity have significant influence on phagocytosis activity. The phagocytosis percentage of blood clam reached the highest values with optimum growth temperature (13-30℃) and salinity (20.0-26.2ppt).
     3. An aspartate racemase (AR) gene was cloned and identified from blood clam. ORF sequence length of blood clam AR gene is1017bp, encoding338amino acids, predicted molecular weight of37.1kDa and theoretical isoelectric point of8.62for the basic protein. Sequence analysis revealed homology of amino acid sequence between the blood clam AR and Burnt-end Ark AR. Compared with sea urchin and sea squirt AR, homology of amino acid sequence has reached51%and41%. Cluster analysis showed that blood clams AR is able to cluster all reported AR. Blood clam AR contains a5'sphate pyridoxal (PLP) binding motif. It is suggested that the role of this molecule requires the presence of PLP.
引文
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