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Reduced histone deacetylase 7 activity restores function to misfolded CFTR in cystic fibrosis

Abstract

Chemical modulation of histone deacetylase (HDAC) activity by HDAC inhibitors (HDACi) is an increasingly important approach for modifying the etiology of human disease. Loss-of-function diseases arise as a consequence of protein misfolding and degradation, which lead to system failures. The ΔF508 mutation in cystic fibrosis transmembrane conductance regulator (CFTR) results in the absence of the cell surface chloride channel and a loss of airway hydration, leading to the premature lung failure and reduced lifespan responsible for cystic fibrosis. We now show that the HDACi suberoylanilide hydroxamic acid (SAHA) restores surface channel activity in human primary airway epithelia to levels that are 28% of those of wild-type CFTR. Biological silencing of all known class I and II HDACs reveals that HDAC7 plays a central role in restoration of ΔF508 function. We suggest that the tunable capacity of HDACs can be manipulated by chemical biology to counter the onset of cystic fibrosis and other human misfolding disorders.

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Figure 1: HDAC inhibitor treatment increases ΔF508 CFTR expression and trafficking.
Figure 2: Chronic low-dose SAHA treatment increases ΔF508 CFTR stability and trafficking.
Figure 3: HDAC inhibitor treatment activates ΔF508 channel activity.
Figure 4: Silencing of HDAC7 increases ΔF508 CFTR expression, trafficking and activity.
Figure 5: SAHA rescues ΔF508 CFTR activity in primary human bronchial epithelial cells.
Figure 6: Mechanism of HDAC7-mediated ΔF508 multitarget pathway correction.

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Acknowledgements

We thank J.P. Clancy (University of Alabama, Birmingham) for the CFBE41o- expressing ΔF508 and the corrected CFBE41o- (WT-HBE41o-) expressing wild-type CFTR. This work was supported by US National Institutes of Health (NIH) grants HL79442 and GM42336 and aid from the Cystic Fibrosis Consortium to W.E.B.; NIH grant NS055781 to J.M.G.; NIH grants DK68196 and DK72506 and aid from the Cystic Fibrosis Consortium to R.A.F.; NIH grant UR98647 and aid from the Cystic Fibrosis Consortium to E.J.S.; NIH grant AG03197 to J.W.K.; NIH grant DK23567 to J.R.R.; NIH grant AG78594 to G.M.; and NIH grant DK075302 and aid from the Canadian Institutes of Health Research to G.L.L. D.M.H. has received support by fellowships from the Canadian Cystic Fibrosis Foundation and the Canadian Institutes of Health Research; D.H. was supported by a fellowship from the Friedreich's Ataxia Research Alliance. T.O. was supported by a fellowship from the Canadian Cystic Fibrosis Foundation.

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The manuscript was written by D.M.H. and W.E.B. D.M.H. from the W.E.B. laboratory was responsible for all western blot assays, iodide efflux data and analyses in CFBE41o- cells. W.K. assisted D.M.H. from the Balch laboratory in providing technical support for assays. D.H. from the J.M.G. laboratory performed all qRT-PCR analysis of CFTR and HDAC expression. A.P.C.R. from the G.M. laboratory performed the microarray analysis. S.N. from the R.A.F. laboratory performed all short-circuit current and western analyses in primary DF/DF-HBE cells, which were obtained through a collaboration with J.M.P. B.H. from the W.E.B. laboratory performed the ChIP analysis. A.S. from the P.J.T. laboratory performed the thermal melt curve analysis of CFTR-NBD1. Y.M. from the W.R.S. laboratory performed the in vitro translation analysis. M.G. performed the cell surface expression of DF508-CFTRextope in primary HBE cells. T.O. from the G.L.L. laboratory performed the cell surface stability analysis. E.J.S. performed the short-circuit analysis of TSA in CFBE41o- cells. J.R.R. performed the cell surface analysis. J.M. from the W.E.B. laboratory performed all pulse chase analyses. J.W.K. laboratory tested the effect of SAHA on L444P-glucoceribrosidase. W.E.B. directed all aspects of the project. R.A.F., P.J.T., E.J.S., W.R.S., J.R.R., M.G., J.M.G., G.L.L., J.R.Y. and G.M. supervised specific aspects of the project. W.E.B., R.A.F., P.J.T., E.J.S., W.R.S., J.R.R., M.G., J.M.G., G.L.L., J.R.Y. and G.M. provided financial support.

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Correspondence to William E Balch.

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J.W.K. is a founder and W.E.B. is a scientific advisor for Proteostasis Therapeutics Inc. of Cambridge, Massachusetts, USA.

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Supplementary Figures 1–11, Supplementary Table 1 and Supplementary Methods (PDF 8171 kb)

Supplementary Table 2

Microarray data for CFBE41o- cells following HDAC1 and 7 silencing. (XLS 4843 kb)

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Hutt, D., Herman, D., Rodrigues, A. et al. Reduced histone deacetylase 7 activity restores function to misfolded CFTR in cystic fibrosis. Nat Chem Biol 6, 25–33 (2010). https://doi.org/10.1038/nchembio.275

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