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Wednesday, May 1, 2019

吸入劑型MIS416 (青春痘菌微粒) 有助氣喘治療


中研院利用青春痘菌 研發治療氣喘新藥 20190425日【記者徐翠玲/綜合報導】中研院生物醫學科學研究所助研究員張雅貞團隊發現,利用青春痘菌研發出免疫調控微粒子(MIS416),把這免疫調控微粒子以吸入劑型投藥,可抑制第二型先天免疫細胞(ILC2)增生,有助氣喘治療。研究成果已刊登於《過敏和臨床免疫學雜誌》(Journal of Allergy and Clinical Immunology)。類固醇是治療氣喘主要用藥。張雅貞表示,過去認為T細胞才是造成氣喘的主因,並以類固醇吸入劑治療;隨著愈來愈多類固醇抗藥性患者增加,研究團隊發現ILC2誘發急性呼吸道免疫反應,與類固醇抗藥性氣喘相關,ILC2細胞因此被視為新的氣喘治療標的。張雅貞指出,氣喘疾病是一種免疫失衡,ILC2細胞作用於免疫系統中,會被塵蹣、黴菌誘發活化,傳遞氣喘發炎反應訊息,造成氣管收縮、黏液分泌亢進等症狀。張雅貞說,研究發現帶有類鐸受體9TLR9)配體(CpG)的免疫調控微粒子,可分泌干擾素抑制ILC2細胞傳遞發炎反應訊息。透過類鐸受體9TLR9)與配體(CpG)結合後,刺激漿細胞樣樹突狀細胞分泌α型干擾素;進而活化自然殺手細胞增加γ型干擾素分泌量,達到抑制ILC2細胞增生的效果。微粒子(MIS416)含有能刺激分泌干擾素的TLR9配體(CpG)成分,研究團隊以吸入劑型投藥進行老鼠實驗,期望在侵入性最小的情況下將藥物送入肺部,發現可抑制ILC2細胞所導致的氣喘症狀;對於T細胞導致的氣喘症狀也有療效,相較於目前的類固醇處方藥更具優勢。張雅貞表示,微粒子(MIS416)源自會造成青春痘的痤瘡丙酸桿菌,也就是大家熟悉的青春痘菌,含有CpG成分,且具有生物可分解性,對於人體相當安全且耐受性良好。目前正在進行人體試驗中,預計相關藥物最快10年可面世。張雅貞說,目前已經正在進行人體試驗中,初步的人體試驗發現對人體相當安全且耐受性良好,預計相關藥物最快10年就可面世。

MIS416 is an experimental drug developed by Innate Immunotherapeutics which underwent clinical trials to treat secondary progressive multiple sclerosis. It is derived from the bacteria that causes acne and targets myeloid cells through TLR9 and NOD2 In one of its first rounds of clinical trials, the drug was shown to be "safe and well tolerated", with 80% of secondary-progressive multiple sclerosis patients exhibiting more than 30% improvement in at least one area of their MS status. However, Phase II clinical trials were unable to prove that the drug provided a benefit to patients. It is also being researched as a potential treatment for cancer.

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