Rbpjl,也称为RBPJL或RBPJ-like,是一种重要的转录因子,与RBPJ(Recombination Signal Binding Protein for Immunoglobulin kappa J region)具有序列同源性,但在功能和调节机制上存在差异。Rbpjl在胰腺发育和维持成人外分泌胰腺功能中起着至关重要的作用。在早期胰腺发育过程中,Rbpjl逐渐取代RBPJ,成为PTF1复合物的一部分,PTF1复合物是由PTF1a、E蛋白和RBPj(或Rbpjl)组成的转录三聚体复合物。Rbpjl的表达和活性对于胰腺泡状细胞的成熟和功能至关重要,它通过调节分泌蛋白的合成、线粒体代谢、细胞质肌酸磷酸能量储备、包装和分泌装置的完整以及维持胰腺泡状细胞稳态来促进胰腺泡状细胞的分化[4]。此外,Rbpjl还与SHARP/SPEN相互作用,后者是Notch通路的中心共抑制因子,表明Rbpjl可能在Notch信号传导中发挥调节作用[2]。
Rbpjl的突变或表达异常与多种疾病的发生发展有关。例如,Rbpjl的p.P476S突变被发现会抑制抗PD-1疗法在食管鳞状细胞癌中的疗效,这是通过减弱T细胞反应来实现的[5]。此外,Rbpjl的p.(Thr280Met)变异与2型糖尿病(T2D)的风险增加相关,这可能通过调节外分泌酶的表达来实现[7]。此外,Rbpjl的缺失或表达异常还与胰腺癌的发生发展有关[1,3,6]。
综上所述,Rbpjl是一种重要的转录因子,在胰腺发育和维持成人外分泌胰腺功能中发挥着重要作用。Rbpjl的突变或表达异常与多种疾病的发生发展有关,包括胰腺癌、食管鳞状细胞癌和2型糖尿病。进一步研究Rbpjl的功能和调节机制对于理解这些疾病的发病机制和开发新的治疗方法具有重要意义。
参考文献:
1. Bailey, Peter, Chang, David K, Nones, Katia, Biankin, Andrew V, Grimmond, Sean M. 2016. Genomic analyses identify molecular subtypes of pancreatic cancer. In Nature, 531, 47-52. doi:10.1038/nature16965. https://pubmed.ncbi.nlm.nih.gov/26909576/
2. Pan, Leiling, Hoffmeister, Philipp, Turkiewicz, Aleksandra, Borggrefe, Tilman, Oswald, Franz. 2021. Transcription Factor RBPJL Is Able to Repress Notch Target Gene Expression but Is Non-Responsive to Notch Activation. In Cancers, 13, . doi:10.3390/cancers13195027. https://pubmed.ncbi.nlm.nih.gov/34638511/
3. Jiang, Jinmai, Hakimjavadi, Hesamedin, Bray, Julie K, Chamala, Srikar, Schmittgen, Thomas D. 2023. Transcriptional Profile of Human Pancreatic Acinar Ductal Metaplasia. In Gastro hep advances, 2, 532-543. doi:10.1016/j.gastha.2023.02.003. https://pubmed.ncbi.nlm.nih.gov/37425649/
4. Masui, Toshihiko, Swift, Galvin H, Deering, Tye, Magnuson, Mark A, MacDonald, Raymond J. 2010. Replacement of Rbpj with Rbpjl in the PTF1 complex controls the final maturation of pancreatic acinar cells. In Gastroenterology, 139, 270-80. doi:10.1053/j.gastro.2010.04.003. https://pubmed.ncbi.nlm.nih.gov/20398665/
5. Miao, Lei, Wei, Xiao-Li, Zhao, Qi, Wang, Feng-Hua, Xu, Rui-Hua. 2020. p.P476S mutation of RBPJL inhibits the efficacy of anti-PD-1 therapy in oesophageal squamous cell carcinoma by blunting T-cell responses. In Clinical & translational immunology, 9, e1172. doi:10.1002/cti2.1172. https://pubmed.ncbi.nlm.nih.gov/32994998/
6. Masui, Toshihiko, Long, Qiaoming, Beres, Thomas M, Magnuson, Mark A, MacDonald, Raymond J. . Early pancreatic development requires the vertebrate Suppressor of Hairless (RBPJ) in the PTF1 bHLH complex. In Genes & development, 21, 2629-43. doi:. https://pubmed.ncbi.nlm.nih.gov/17938243/
7. Nair, Anup K, Sutherland, Jeff R, Traurig, Michael, Bogardus, Clifton, Baier, Leslie J. 2018. Functional and association analysis of an Amerindian-derived population-specific p.(Thr280Met) variant in RBPJL, a component of the PTF1 complex. In European journal of human genetics : EJHG, 26, 238-246. doi:10.1038/s41431-017-0062-6. https://pubmed.ncbi.nlm.nih.gov/29302047/