hINHBE小鼠模型在加速靶向人源INHBE基因RNAi療法進(jìn)入臨床中的應(yīng)用
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很多有減肥需求的朋友,對(duì)司美格魯肽一定不會(huì)陌生,這種藥物不但可以用于治療Ⅱ型糖尿病,對(duì)于肥胖人群減重也非常有效。早在2021年該藥物就在美國(guó)獲批了用于非糖尿病成年人減肥的適應(yīng)癥。2024年的6月25日,以改善成年人肥胖/超重的“減肥版”司美格魯肽,也獲得了中國(guó)國(guó)家藥監(jiān)局的批準(zhǔn)。
然而,“神藥”也不完美,據(jù)相關(guān)研究報(bào)道,司美格魯肽約40%的減重來(lái)自骨骼和肌肉的減少,且大部分患者在停藥后體重會(huì)迅速反彈。
基于此,全球眾多藥物研發(fā)機(jī)構(gòu)正在積極尋找新的靶點(diǎn),以期開發(fā)出一款更安全更有效的藥物。在這樣的浪潮下,INHBE應(yīng)運(yùn)而生。
INHBE概述
INHBE基因編碼的是抑制素亞基βE(Inhibin Subunit Beta E),是TGF-β(轉(zhuǎn)化生長(zhǎng)因子-β)蛋白質(zhì)超家族的成員,主要在肝臟中表達(dá)。其肝臟表達(dá)水平與人類的胰島素抵抗和體重指數(shù)正相關(guān)。INHBE蛋白的罕見預(yù)測(cè)功能缺失(pLOF)突變患者腹部脂肪明顯減少,代謝狀況良好,且罹患心血管疾病和Ⅱ型糖尿病的風(fēng)險(xiǎn)顯著降低。
Fig.1 Gene-level associations with waist-to-hip ratio adjusted for BMI[1]
Fig.2 Protein-truncating variants in INHBE associated with favorable fat distribution[2]
靶向INHBE藥物研發(fā)現(xiàn)狀
INHBE的出現(xiàn)吸引了多家RNAi領(lǐng)先企業(yè)布局,如Arrowhead、Wave Life Sciences等。藥渡檢索結(jié)果顯示,目前INHBE靶點(diǎn)在研藥物共3個(gè),均處于臨床前研究階段。其中,Arrowhead計(jì)劃在年底前提交ARO-INHBE臨床試驗(yàn)申請(qǐng),Wave Life將在今年確定INHBE GalNAc-siRNA的臨床候選藥物,并計(jì)劃在明年提交臨床試驗(yàn)申請(qǐng)。與GLP-1R這一熱門靶點(diǎn)相比,INHBE靶點(diǎn)的競(jìng)爭(zhēng)程度相對(duì)溫和,有著巨大的市場(chǎng)潛力。
(來(lái)源于藥渡)
南模生物長(zhǎng)期致力于藥物靶點(diǎn)人源化模型研究領(lǐng)域,自主研發(fā)了hINHBE小鼠模型(目錄號(hào):NM-HU-233512),該模型利用同源重組,將小鼠INHBE基因進(jìn)行人源化修飾。這將有助于加速靶向人源INHBE基因的RNAi療法進(jìn)入臨床階段,相關(guān)驗(yàn)證數(shù)據(jù)如下:
Fig.1 Detection of INHBE expression in liver by RT-PCR.
Wild type: only one band at 192 bp with primers F1/R1 (mInhbe);
Homozygous: only one band at 217 bp with primers F2/R2 (hINHBE).
Abbr. M, DNA marker; HO, homozygous; WT, wild type.
Fig.2 Detection of human INHBE expression in liver in hINHBE knockin mice by WB.
Abbr. M, marker; WT, wild type; HO, homozygous; PC, positive control, Hep G2 cells.
Note. The anti-human INHBE Antibody cross-reacted with mouse INHBE and humanized INHBE. Arrow indicates expected molecular weight and asterisk indicates a nonspecific band.
Fig.3 Detection of hINHBE expression in serum by ELISA (n=3).
Note. The human INHBE Elisa kit cross-reacted with mouse INHBE and humanized INHBE.
參考文獻(xiàn):
[1]Deaton AM, Dubey A, Ward LD, et al. Rare loss of function variants in the hepatokine gene INHBE protect from abdominal obesity. Nat Commun. 2022;13(1):4319. Published 2022 Jul 27. doi:10.1038/s41467-022-31757-8
[2]Akbari P, Sosina OA, Bovijn J, et al. Multiancestry exome sequencing reveals INHBE mutations associated with favorable fat distribution and protection from diabetes. Nat Commun. 2022;13(1):4844. Published 2022 Aug 23. doi:10.1038/s41467-022-32398-7
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