【正文】
四、抗原加工遞呈的意義 ? 實現(xiàn)免疫系統(tǒng)對非己抗原的免疫監(jiān)視作用 ? 免疫調(diào)節(jié)作用 小 結(jié) ? 基本概念: APC ? APC的種類 ? 內(nèi)外性抗原加工遞呈的過程 ? 生理意義 。 7 encoded in the MHC Proteasome cleaves proteins after hydrophobic and basic amino acids and releases peptides into the cytoplasm Cytoplasmic cellular proteins, including nonself proteins are degraded continuously by a multicatalytic protease of 28 subunits Crystal Structure Of The 20s Proteasome From Yeast View End on Endoplasmic reticulum Peptide Peptide HSV protein blocks transport of viral peptides into ER Sent to lysosomes for degradation Evasion of immunity by interference with endogenous antigen processing (三)非經(jīng)典遞呈途徑 交叉遞呈 ? MHCI類分子也能遞呈外源性抗原,MHCII類分子也能遞呈內(nèi)源性抗原。 4. 內(nèi)源性抗原肽的遞呈 ? 結(jié)合了肽的 I類分子在高爾基體中與 TAP1相關(guān)蛋白解離,通過外吐空泡運送到細胞表面,供 CD8+T細胞識別。 ? TAP分子位于內(nèi)質(zhì)網(wǎng)膜上,其跨膜段在內(nèi)質(zhì)網(wǎng)膜上環(huán)繞形成跨膜孔道。