商品肉鸭免疫抑制病病原体共感染情况调查

从山东省不同地区采集病、死肉鸭397份以及临床健康肉鸭200份,用特异性核酸探针对样品进行H9N2亚型禽流感病毒(H9N2AIV)、禽偏肺病毒(aMPV)、呼肠孤病毒(DRV)、鸭圆环病毒(DuCV)、传染性法氏囊病病毒(IB-DV)、禽网状内皮组织增生症病毒(REV)的检测。结果,自然发病肉鸭中H9N2AIV、aMPV、DRV、REV、DuCV、IB-DV检出率分别为57.43%、51.39%、38.54%、39.55%、29.47%、10.58%,且存在多重感染现象,二重和三重感染率分别为26.20%、18.89%,以aMPV和H9N2AIV、REV和DuCV检出率较高;而临床健康肉鸭群中H9N2AIV、aMPV、DRV、REV、DuCV、IBDV检出率均分别为7.00%、19.5%、15.5%、10.5%、24.00%、9.00%,呈阴性的和单一感染的样品分别占40.00%和28.00%;共感染率为32.00%,且主要是二重感染。上述结果表明,商品肉鸭群中普遍存在免疫抑制病病原体共感染的现象,这成为目前肉鸭发病和生长缓慢的重要流行病学因素之一。

Adenoviral-mediated localized CTLA-4Ig gene expression induces long-term allograft pancreas survival and donor-specific immune tolerance in rats

T cell activation following alloantigen recognition plays a critical role in the development of the rejection in all solid organ, tissue and cell transplantation. A recombinant molecule, cytotoxic T lymphocyte antigen 4 antibody （CTLA-4Ig）, is known to induce to T-cell into ＂anergy＂ by blocking the costimulatory B7-CD28 interaction. Either systemic or localized administration of CTLA-Ig has been shown to prolong allograft survival and induce donor-specific tolerance in some transplant models. In this study, we characterized the expression and immunosuppressive effectiveness of adenoviral-mediated CTLA-4Ig gene transfer. We demonstrated transduction of the allografts with AdCTLA-4Ig resulted in localized expression, permanent graft survival and stable donor-specific tolerance. In addition, by performing simultaneous dual-organ through a local expression of CTLA-4Ig via adenoviral-mediated transplantation, we targeted on immunosuppression gene transfer into pancreatic allografts.