Journal
JOURNAL OF BIOPHOTONICS
Volume 13, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jbio.201900174
Keywords
cystic fibrosis - CF; cystic fibrosis transmembrane regulator - CFTR; F508del mutation; Fourier transform infrared microspectroscopy - microFTIR; infrared - IR; principal component analysis - PCA; protein folding; synchrotron radiation
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The mid-infrared (IR) spectra of human cystic fibrosis (CF) cells acquired by Fourier transform infrared microspectroscopy were compared with those of non-CF cells. Within the 1700 to 1480 cm(-1) spectral domain of amides, unsupervised explorative principal component analysis identified a few variables reflecting quantitative and qualitative vibrations arising from protein secondary structures and amino acid side chains. Their pattern reflected alpha-helix to beta-sheet transitions in bronchial epithelial cells and in immortalized peripheral blood mononuclear cells from patients with R1162X missense or in-frame F508del mutations in the cystic fibrosis transmembrane regulator gene (Cftr). Similar transitions have been described in IR spectra of cells, tissues and body fluids of patients affected with some neurodegenerative diseases characterized by the accumulation of misfolded protein aggregates. The variables pattern was able to distinguish CF cells from non-CF cells and was modified by molecular compounds used to rescue the unbalanced folding process of mutated cystic fibrosis transmembrane regulator (CFTR) anion channel. To our knowledge, this is the first experimental evidence of spectroscopic biomarkers of the impaired biogenesis of CFTR by IR microanalysis in the spectra of human CF bronchial epithelial and lymphoblastoid cells.
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