Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

QPCT-PDIA4 rescues ΔF508 and N1303K CFTR function in cystic fibrosis

ABSTRACT: Cystic fibrosis (CF) is a genetic disorder caused by CFTR mutations, most commonly ΔF508, leading to defective ion transport and multisystem pathology. Small-molecule modulators partially restore mutant CFTR function, but therapeutic efficacy remains limited, particularly for N1303K mutation refractory to current treatments. Here, we show that inhibition of the glutaminyl-peptide cyclotransferase (QPCT)-dependent pathway rescues both the surface expression and functional activity of ΔF508 CFTR. Integrated molecular and physiological analyses identify protein disulfide-isomerase A4 (PDIA4) as a key mediator of this rescue via its pyroglutamate (pGlu)-dependent interaction with ΔF508 CFTR, which is essential for surface trafficking. Furthermore, inhibition of QPCT also restores the function of the N1303K CFTR mutant, revealing a broader mechanistic relevance of this pathway in correcting CFTR misfolding and trafficking defects. These findings uncover a generalizable mechanism for correcting CFTR folding abnormalities and suggest new therapeutic strategies for mutations unresponsive to existing modulators.

INSTRUMENT(S):

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Epithelial Cell, Cell Culture

DISEASE(S): Cystic Fibrosis

SUBMITTER: Le Sun

LAB HEAD: John Yates

PROVIDER: PXD069857 | Pride | 2026-06-05

REPOSITORIES: Pride

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
	20250419_PDIA4_IP_shCTR_1.raw	Raw
	20250419_PDIA4_IP_shCTR_2.raw	Raw
	20250419_PDIA4_IP_shCTR_3.raw	Raw
	20250419_PDIA4_IP_shQPCT_1.raw	Raw
	20250419_PDIA4_IP_shQPCT_2.raw	Raw

Items per page:

1 - 5 of 15

Similar Datasets

Integrative genomic meta-analysis reveals novel molecular insights into cystic fibrosis and ΔF508-CFTR rescue

Project description:Cystic fibrosis (CF), caused by mutations to CFTR, leads to severe and progressive lung disease. The most common mutant, ΔF508-CFTR, undergoes proteasomal degradation, depleting its anion channel function. “Proteostasis” pathways, i.e. those relevant to protein processing and trafficking, are altered in cells with ΔF508-CFTR and can be modulated to partially rescue protein function. However, many details regarding proteostasis modulation, and its relevance to CF and ΔF508-CFTR rescue, remain poorly understood. To shed light on this, we re-analyzed public datasets characterizing transcription in CF vs. non-CF epithelia from human and pig airways, and also profiled established temperature, genetic, and chemical interventions that rescue ΔF508-CFTR. Meta-analysis yielded a core disease signature and two core rescue signatures. To interpret these, we compiled proteostasis pathways and an original “CFTR Gene Set Library”. The disease signature revealed differential regulation of mTORC1 signaling, endocytosis, and proteasomal degradation. Overlaying functional genomics data identified candidate mediators of low-temperature rescue, while multiple rescue strategies converged on activation of unfolded protein response pathways. Remarkably, however, C18, an analog of the CFTR corrector compound Lumacaftor, induced minimal transcriptional perturbation despite its rescue activity. This work elucidates the involvement of proteostasis in both disease and rescue perturbations while highlighting that not all CFTR rescue interventions act on transcription.

2020-12-01 | GSE142610 | GEO

Rescue Of Dysfunctional Autophagy By Peptide IDR-1018 Attenuates Hyperinflammatory Phenotype Of Cystic Fibrosis Cells

2012-11-05 | GSE35391 | GEO

Transcriptional profiling of CFBE41o-ΔF508 cells and CFBE41o−CFTR cells.

Project description:Cystic fibrosis bronchial epithelial (CFBE41o-ΔF508) cells subjected to 23 bio-active small molecules including vehicle controls, at low temperature and untreated cells. Untreated Cystic fibrosis bronchial epithelial cells (CFBE41o−CFTR) are also included.

2016-12-12 | GSE67698 | GEO

A microRNA network regulates expression and biosynthesis of CFTR and CFTR-ΔF508.

Project description:Production of functional proteins requires multiple steps including gene transcription and post-translational processing. MicroRNAs (miRNA) can regulate individual stages of these processes. Despite the importance of the cystic fibrosis transmembrane conductance regulator (CFTR) channel for epithelial anion transport, how its expression is regulated remains uncertain. We discovered that microRNA-138 regulates CFTR expression through its interactions with the transcriptional regulatory protein SIN3A. Treating airway epithelia with a miR-138 mimic increased CFTR mRNA and also enhanced CFTR abundance and transepithelial Cl- permeability independently of elevated mRNA levels. A miR-138 anti-miR had the opposite effects. Importantly, miR-138 altered the expression of many genes encoding proteins that associate with CFTR and may influence its biosynthesis. The most common CFTR mutation, ΔF508, causes protein misfolding, degradation, and cystic fibrosis. Remarkably, manipulating the miR-138 regulatory network also improved biosynthesis of CFTR-ΔF508 and restored Cl- transport to cystic fibrosis airway epithelia. This novel miRNA-regulated network directs gene expression from the chromosome to the cell membrane, indicating that an individual miRNA can control a cellular process broader than previously recognized. This discovery also provides new therapeutic avenues for restoring CFTR function to cells affected by the most common cystic fibrosis mutation.

2012-09-04 | GSE38956 | GEO

Eccrine sweat proteomics for the diagnosis of cystic fibrosis

Project description:In clinical routine, the diagnosis of cystic fibrosis (CF) is still a challenge due to the limitations of diagnosis guidelines and tests. A diagnosis test of choice, the sweat test measures eccrine sweat chloride concentration as a byproduct of the eccrine sweat gland CFTR function. Despite the combined use of CFTR genotyping and direct physiologic testing of CFTR function, reports of inconclusive diagnosis justified the need for alternative tests and new biomarkers. Meanwhile, eccrine sweat composition has already been linked to disease-specific profiles of non-electrolytes (i.e. proteins, peptides and metabolites). In this study, we analyzed sweat samples from 28 healthy volunteers and 14 CF patients by UHPLC-Q-Orbitrap-based Shotgun proteomics, to address CF-related changes in sweat protein composition and abundance. Over 1000 proteins were identified and quantified in a label-free manner. Beside similar protein composition, enrichment and functional classifications, HV and CF samples were grouped apart since protein abundance profiles were significantly correlated with CF status and degree of severity (ΔF508 homozygous and pancreatic insufficiency onset). Four-hundred and two proteins in CF-specific abundance, 68 proteins in genotype-specific abundance and 71 proteins in abundance related to pancreatic status, respectively, highlighted eccrine gland cell perturbations in protein biosynthesis & trafficking, CFTR proteostasis & membrane stability, cell-cell adherence, membrane integrity & cytoskeleton crosstalk. Cytoskeleton-related biomarkers were of utmost interest because of consistent abundances between CF sweat and other CF tissues. Nine clinical CF diagnosis biomarker (CUTA, ARG1, EZR, AGA, FLNA, MAN1A1, MIA3, LFNG, SIAE) and 5 CF severity biomarker (ARG1, GPT, MDH2, EML4 (ΔF508 homozygous), MGAT1 (pancreatic insufficiency)) candidates were deemed suitable for further verification.

2022-10-13 | PXD028518 | Pride

Rescue Of Dysfunctional Autophagy By Peptide IDR-1018 Attenuates Hyperinflammatory Phenotype Of Cystic Fibrosis Cells

Project description:Genome-wide gene expression was measured in two cell lines: CF bronchial epithelial cell line IB3-1 (compound heterozygote for the ΔF508 and W1282X CFTR mutations) and the isogenic, CFTR-corrected C38 cell line, after treatment with the flagellin protein FliC, and/or synthetic peptide IDR-1018. Total RNA was obtained from cell lines representing CF and normal epithelial cells after treatment with the fliC protein (that is known to play a role in CF lung inflammation), and/or the peptide IDR-1018 that has anti-inflammatory properties. Comparison of genes and pathways affected by these treatments indicated the role of autophagy process in CF disease.

2012-11-05 | E-GEOD-35391 | biostudies-arrayexpress

Homo sapiens

Project description:A microRNA network regulates expression and biosynthesis of CFTR and CFTR-ΔF508.

| PRJNA169413 | ENA

Targeting of specific miR-145-5p or miR-223-3p binding sites restores CFTR activity in CF BECs

Project description:Background. Accumulating evidence indicates that CFTR modulators can be effective for CF sufferers. However, in vivo the microRNAs that regulate CFTR are increased in the CF lung milieu and this can nullify the beneficial effects of CFTR modulators. Methods. A panel of target site blockers (TSBs) designed against the CFTR 3’untranslated region (UTR) were tested for their ability to increase CFTR expression by CFTR 3’UTR luciferase assay and western blot. The effect of two lead TSBs on CFTR activity were tested alone or in combination with selected CFTR modulators in four separate p.Phe508del/p.Phe508del in vitro and ex vivo models (CFBE41o-, Cufi-1, primary bronchial epithelial cells, iPSC-derived lung organoids). Respirable poly-lactic-co-glycolic acid (PLGA) nanoparticles encapsulating the TSBs were formulated and tested. Findings. TSBs that target the miR-145-5p or miR-223-3p binding sites at positons 298-305 and 166-173 in the CFTR 3’UTR, respectively, increased CFTR expression and CFTR anion channel activity, and enhance the effects of Lumacaftor/Ivacaftor or Lumacftor/Tezacaftor in CF BECs. PLGAs encapsulating the TSBs promote CFTR expression in primary BECs and retain their biophysical characteristics following nebulization. Interpretation. Alone or in combination with CFTR modulators, CFTR-targeting TSBs encapsulated in PLGA nanoparticles and nebulized to the lung could overcome microRNA-mediated inhibition of CFTR in CF bronchial epithelium. This strategy represents a promising drug-device combination therapy for the treatment for CFTR dysfunction in the lung.

2019-03-27 | GSE128861 | GEO

TUG protein acts through a disordered region to organize the early secretory pathway

Project description:The Endoplasmic Reticulum (ER)-Golgi Intermediate Compartment (ERGIC) is a network of tubules and vesicles known for producing COPI vesicles and receiving COPII vesicles from the ER. Much about its identity, stability, and regulation remains unknown. Here, we show that the TUG (UBXN9, Aspscr1) protein, a central regulator of GLUT4 trafficking, localizes to the ERGIC, and its deletion enhances anterograde secretory flux, redistributes ERGIC markers to the cis-Golgi, and alters Golgi morphology. TUG forms biomolecular condensates in vitro and contains a central disordered region that mediates its recruitment to ERGIC membranes. A distinct N-terminal region mediates its oligomerization in cells. TUG deletion disrupts ERGIC-dependent processes, including autophagy and collagen secretion, and alters the targeting of CFTR, a model protein that undergoes unconventional secretion. We conclude that TUG organizes and stabilizes ERGIC membranes to support their roles in diverse cellular membrane trafficking pathways.

2025-06-10 | PXD064240 | Pride

Homo sapiens

Project description:Transcriptional profiling of CFBE41o-ΔF508 cells and CFBE41o−CFTR cells.

| PRJNA280723 | ENA