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《低毒力豬瘟病毒39株感染及其對豬瘟弱毒疫苗C株免疫效力影響的研究》由會員上傳分享,免費在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、摘要本研究從免疫細胞和免疫分子的角度,探討了低毒力豬瘟病毒(CSFV一39)感染拜的免疫學(xué)機制,并進一步揭示了低毒力cs懈染對豬瘟弱毒疫茍疫苗免疫效力的影響。實驗通過臨床和病理評價結(jié)合體溫反應(yīng),證實CSFV一39屬于低毒力豬瘟病毒。研究表明,CSFV-39感染引起外周血B細胞和CD4+CD8一、CD4+CD8+T細胞下降,粒細胞和單核細胞輕微上升,以及SLA—I、sLA一Ⅱ在單核細胞、淋巴細胞、粒細胞上表達下降;石門強毒感染后則引起各細胞亞群和SLA—I、sLA—II表達急劇下降;而豬瘟弱毒疫苗免疫卻不引起這些指標(biāo)的明顯變化。CSFV一39感染并不抑制T、B細胞的增殖能力,僅對N
2、K殺傷活性有輕微的降低作用;石門強毒感染則使外周血單個核細胞對刀豆蛋白和脂多糖的反應(yīng)及NK殺傷活性都顯著降低,可能是細胞減少或細胞活性下降的緣故;而疫苗免疫的影響不顯著。CSFV-39感染主要引起細胞免疫,但不能完全保護強毒攻擊;而疫苗免疫主要引起體液免疫,并對強毒攻擊有很好的保護作用。CSFV一39感染產(chǎn)生的細胞免疫作用可以抑制疫苗在體內(nèi)的復(fù)制,從而降低了疫苗的免疫效力。主要表現(xiàn)在免疫和攻毒后的抗體產(chǎn)生水平下降、攻毒后血液和扁桃體帶毒時問延長、出現(xiàn)體溫反應(yīng)、臨床癥狀和病理變化、病毒在組織中分稚加劇等方面。關(guān)鍵詞:CSFV一39;弱毒疫苗;細胞免疫;體液免疫:免疫效力;Abstr
3、actBasedOnthechangesofimmunocytcsandimmuno-molecalesoftheinfectedpigs,thisstudyprobestheimmunomechanismoflowvirulentclassicalswinefevervirus(CSFV)anditseffectontheefficacyofattenuatedCSFV-Cstrainimmunization.TheCSFV-39strainwasquantifiedtobeoflowvirulencebyevaluatingtheclinicalandpathological
4、signsandbodytemperatureresponsesitcaused.ResultsshowedthatCSFV-39inducedaslishtdecl'ea.qeofB-lymphocytes,CD4+CD8一andCD4+CD8+T-lymphocytesandatinyincreaseofmollocytesandgranalocytesinblood,whileCSFVshimenstraincaIlscdadepletionofalllankocytesandaRenuatedCSFV-Cstraindidnotaffectthecountofthesec
5、ells.CSFV-39broughtadropofSLA-IandSLA-lionmonocytes,lymphocytesandgranulocytesandCSFVshimcnstrainalsocaughta洲f;cfallofSLA-IandSLA.II:meanwhile,attenuatedCSFV-Cstrainhadlittleeffectonbothofthem.ItrevealedthatCSFV-39didnotinhibittheproliferativeresponsesahihtiesofTandBlymphoeytesbuthadalittlein
6、fluenceonthenaturalkiller呻日lysisratio,whileCSFVshimenstraininhibitedtheproliferativeresponsesabilitiesandtheNKlysisratioseverely.ButattenuatedCSFV-CstraindidnothaveanyinfluenceOnthem.CSFV-39wasprovedtoinducecellularimmtlileresponsemostly,whichcouldnotfullyprotectthepigsfromthechallengeofhxghv
7、irulentCSFVstrains;butattenuatedCSFV-CstraincausedchieflyhumoralinllTlunerespollse,whichhadagoodprotectofchallenge.RshowedthatthereplicationofattenuatextCSFV-CstraincouldbeinhibitedbythecellularimmureresponseOfCSFV-39infection,whichreducedthe