The CFTR Antibody is a research tool designed to detect the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) protein, a cAMP-regulated chloride channel critical for ion transport across epithelial surfaces. These antibodies are used extensively in molecular biology to study CFTR localization, expression, and dysfunction in cystic fibrosis (CF) and related diseases .
Monoclonal Antibodies: Engineered to target specific epitopes (e.g., N-terminal, R-domain, or C-terminal regions). Examples include MA1-935 (targets amino acids 103–117 in the first extracellular loop) and MAB25031 (C-terminal epitope) .
Polyclonal Antibodies: Less specific but useful for broader detection in immunoprecipitation or ELISA .
CFTR is a 168 kDa protein belonging to the ATP-binding cassette (ABC) transporter family. Antibodies target distinct regions:
Used to detect CFTR protein in cell lysates. For example, MA1-935 identifies a ~170 kDa band in T84 cell extracts . Cross-reactivity with non-CFTR proteins (e.g., rootletin X1 in ciliated cells) has been reported .
Localized CFTR to ciliary bases in bronchial epithelial cells . MA1-935 and 596 show apical staining in wild-type CFTR but also bind non-specifically in F508del-CFTR cells .
MAB25031 co-precipitates CFTR with COMMD1 in HT-29 cells, revealing protein interactions .
Rootletin X1 Cross-Reactivity: Antibodies like 596 bind rootletin X1 in ciliated cells, mimicking CFTR expression .
False Positives in Immune Cells: mRNA detection of CFTR in T cells/NK cells does not correlate with protein expression due to non-specific binding .
Peptide Competition: Neutralizes antibody binding to confirm specificity .
CRISPR Knockouts: Used in to validate CFTR detection in macrophages.
The CFTR Antibody Distribution Program (administered by the Cystic Fibrosis Foundation) provides validated antibodies for research .
STED microscopy resolved CFTR clusters at ciliary bases, aiding localization studies .
Antibodies like MA1-935 and 66928-1-Ig detect CFTR in human, mouse, and rabbit models, facilitating cross-species studies .
Applications : WB
Sample type: Human Caco-2 cells
Review: Immunoblot of CFTR protein from control, mock-treated and CFTR siRNA-treated Caco-2 cells. Alpha-tubulin bands with molecular mass 50 kDa were detected at equal levels.