Ask about this productRelated genes to: ATP6V1A Blocking Peptide
- Gene:
- ATP6V1A NIH gene
- Name:
- ATPase H+ transporting V1 subunit A
- Previous symbol:
- VPP2, ATP6A1, ATP6V1A1
- Synonyms:
- Vma1, VA68
- Chromosome:
- 3q13.31
- Locus Type:
- gene with protein product
- Date approved:
- 1990-07-03
- Date modifiied:
- 2016-02-11
Related products to: ATP6V1A Blocking Peptide
Related articles to: ATP6V1A Blocking Peptide
- Recent clinical trials have shown that dual GLP-1R/GCGR agonists, including mazdutide and cotadutide, provide kidney benefits in patients with type 2 diabetes and CKD, suggesting a potential contribution of GCGR activation to these renal effects. However, whether GCGR directly confers renoprotection and the underlying mechanisms remain unclear. Here, using tubule-specific GCGR loss- and gain-of-function mouse models and human kidney samples, we show that tubular GCGR signaling exerts an important renoprotective role in DKD. Tubular GCGR expression is reduced in humans and mice with DKD and correlates with worse kidney function and increased renal injury. Genetic ablation of tubular GCGR markedly exacerbates DKD and induces pronounced phospholipid accumulation within enlarged lysosomes. Mechanistically, GCGR loss disrupts its association with the V-ATPase V1A subunit ATP6V1A, compromises V1-V0 assembly, and thereby impairs lysosomal acidification. This defect leads to impaired phospholipid hydrolysis and protease maturation, blockade of autophagic flux, and ultimately tubular cell injury. In vivo, ATP6V1A overexpression markedly reverses GCGR deficiency-induced lysosomal dysfunction and DKD progression. Consistently, re-expression of tubular GCGR via AAV9 restores lysosomal function, reduces phospholipid accumulation, and mitigates renal injury in DKD. Together, these findings provide genetic evidence for the renoprotective role of tubular GCGR in DKD, delineate a kidney-intrinsic GCGR-ATP6V1A-lysosome axis that protects tubular integrity, and extend prior GCGR-in-kidney observations into a more concrete GCGR-lysosome mechanism. - Source: PubMed
Publication date: 2026/08/05
Qu HuaXu MingyueDu PanZhang LinlinWang WensiLiu XiufeiZhu JiaranTian ChenfuHe QingshanLi JuTao YiwenGong ZhengyuanYang QingwuZheng YiZheng Hongting - The self-renewal and differentiation of stem cells are tightly controlled to maintain tissue homeostasis. Failure in stem cell maintenance results in stem cell depletion and precocious aging. However, how stem cells are maintained still remains not fully understood. Here, through a large-scale RNAi screen for maintenance and proliferation of adult intestinal stem cells (ISCs), we identify several subunits of V-ATPase including Vha68-2/ATP6V1A, required for ISC proliferation, differentiation and tissue regeneration. Inactivation of Vha68-2 results in accumulation of plasma membrane (PM)-derived structures in autophagosomes and lysosomes through Atg16 and Rab5. Furthermore, defective ISCs undergo direct differentiation due to ectopic Notch activation. Mechanistically, Vha68-2 facilitates Notch receptor internalization and subsequent degradation in autolysosomes to quench ectopic Notch activation, thereby maintaining ISC fate. Truncated Notch product devoid of its extracellular domain is accumulated in autolysosomes upon Vha68-2 deficiency. The Notch products accumulated in autolysosomes still require further cleavage to drive ISC differentiation. The functions of Vha68-2 in macroautophagy/autophagy and ISC maintenance are evolutionarily conserved. Our results provide new insights into the underlying mechanism of how autophagy is involved in stem cell maintenance under physiological conditions. aph-1: anterior pharynx defective 1; ATP6V1A: ATPase H+ transporting V1 subunit A; CASM: conjugation of ATG8s to single membranes; EB: enteroblast; EC: absorptive enterocyte; ER: endoplasmic reticulum; ISC: intestinal stem cell; kuz: kuzbanian; LTDR: LysoTracker Deep Red; LTR: LysoTracker Red; MARCM: mosaic analysis with a repressible cell marker; NECD: Notch extracellular domain; NICD: Notch intracellular domain; PM: plasma membrane; PAS: phagophore assembly site; SNARE: soluble N-ethylmaleimide-sensitive factor-attachment protein receptor; TEM: transmission electron microscopy; TM: tunicamycin. - Source: PubMed
Publication date: 2026/08/03
Li ZhengranZhao HuiqingZhang DanjieWei JingLiu Xiyue TaoKong RuiyanRen XuejingZhao HangFang XiaominFu JingyanLi Zhouhua - Epididymal epithelial cells are critical for sperm maturation. Although previous studies have determined the development of epididymal epithelial cells in rat epididymis, the postnatal developmental trajectories of distinct epithelial cell types in the mouse epididymis remain elusive. Here, we examined the developmental timeline of mouse epididymal epithelium differed from that of the rat by confocal immunostaining and single-cell RNA sequencing (scRNA-seq). In mice, principal and basal cells appeared as early as postnatal day 7 (PD7) across all segments, labeled by AQP9 and KRT5, in contrast to the later emergence in rats (e.g., basal cells at PD14 in rat cauda). ATP6V1A-positive clear cells were detected at PD28 in caput, corpus, and cauda but not in the initial segment, while narrow cells were observed in all segments beginning at PD14. These contrasted with the rat, in which clear cells appeared at PD14. Notably, scRNA-seq and immunostaining identified a previously unrecognized KRT5⁺/ATP6V1A⁺ narrow-like basal cell subpopulation, enriched in lysosomes and mainly localized to the caput and corpus. These findings revealed an earlier epithelial maturation in mice compared to rats, underscoring the importance of choosing animal models. The newly identified basal subpopulation may contribute to luminal acidification and homeostasis, offering new insights into epididymal physiology and reproductive biology. - Source: PubMed
Publication date: 2026/07/17
Li HuixiaXie TaoranYLChan DavidFok Ellis Kin LamZuo LiandongXie GangcaiSha QianqianChen Hao - Photoaging is a form of premature skin aging mainly induced by long-term exposure to ultraviolet exposure. Lysosomes are key organelles responsible for the degradation and recycling of intracellular components and are essential for maintaining metabolic and nutrient homeostasis. Although lysosomal dysfunction is closely associated with cellular aging, the role of V-ATPase in regulating lysosomal function during photoaging remains incompletely understood. By screening a V-ATPase-targeted siRNA library and validating the results using publicly available single-cell transcriptomic datasets, we identified ATP6V1A as a key regulator of UVB-induced cellular senescence. Furthermore, ATP6V1A knockdown exacerbated the UVB-induced cellular senescence and impaired lysosomal acidification and membrane integrity, whereas ATP6V1A overexpression effectively alleviated keratinocyte senescence, lysosomal dysfunction and autophagy inhibition. Moreover, treatment with the V-ATPase inhibitor BafA1 aggregated cellular senescence phenotype and autophagy inhibition and this phenomenon partially reversed by ATP6V1A overexpression. Collectively, ATP6V1A promotes autophagy by regulating lysosomal function, thereby relieving UVB-induced cellular senescence. - Source: PubMed
Publication date: 2026/07/15
Lian PeiqiDeng XuyiWen QingqiuDeng YinyunLiu FenghaoLiu HuiDing ZhenhuaZhou MeijuanWang Yinghui - Prostate cancer (PCa) ranks among the most common and deadly malignancies worldwide. The clinical treatment of advanced prostate cancer is particularly challenging due to acquired drug resistance. Autophagy and lysosome-related pathways are key drivers of this resistance. Targeting the lysosome represents a potential therapeutic strategy for PCa. In this study, we identified Heat Shock Protein Family A Member 8 (HSPA8) as a critical functional node of Aloperine (ALO). ALO suppresses autophagic flux, disrupts lysosomal homeostasis, and induces lysosomal vacuolation in cancer cells by inhibiting the function of HSPA8, impairing chaperone-mediated autophagy (CMA)-mediated ATP6V1A degradation. The resulting pathological accumulation and enhanced V1-V0 association of the V-ATPase complex drive pronounced lysosomal hyperacidification and severe osmotic swelling. This biochemical and physical stress is associated with lysosomal membrane permeabilization (LMP) and downstream loss of lysosomal integrity. Furthermore, we reveal that ALO-induced vacuolation triggers a compensatory upregulation of cholesterol biosynthesis to buffer membrane expansion; preemptively disrupting this adaptive response with the DHCR7 inhibitor AY9944 yields significant synergistic lethality. Collectively, our findings reveal the specific cytotoxic mechanism of ALO and demonstrate that pharmacological targeting of the HSPA8-CMA-ATP6V1A axis is a valuable strategy for inducing lethal lysosomal vacuolation in advanced PCa. - Source: PubMed
Publication date: 2026/06/19
An BingzhengGao ZeChen ShuoMeng LiweiZhang ChenSong KefanCui HaochenYan LeiFang Zhiqing