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01.12.2014 | Research | Ausgabe 1/2014 Open Access

Respiratory Research 1/2014

Impact of heterozygote CFTR Mutations in COPD patients with Chronic Bronchitis

Zeitschrift:
Respiratory Research > Ausgabe 1/2014
Autoren:
S Vamsee Raju, Jody H Tate, Sandra KG Peacock, Ping Fang, Robert A Oster, Mark T Dransfield, Steven M Rowe
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1465-9921-15-18) contains supplementary material, which is available to authorized users.

Competing interests

S.M.R served as PI for CF Clinical Trials sponsored by Vertex Pharmaceuticals and Novartis. He has received COPD-related grant funding from NHLBI and Forest Research Institute. M.T.D has served on COPD-related advisory boards for Ikaria, Forest, GlaxoSmithKline and Boehringer Ingelheim. He has served as site PI for contracted COPD clinical trials sponsored by Aeris, Centocor, Pfizer, Otsuka, Pulmonx, GlaxoSmithKline and Boehringer Ingelheim. He has received COPD-related grant funding from Forest, GlaxoSmithKline and NHLBI.

Authors’ contributions

SVR, JHT, MTD, and SMR conceived of the experiments; SVR, JHT, and SKGP, conducted the research; SVR, JHT, RO, PF, MTD, MTD, and SMR analyzed the data; SVR and SMR wrote the manuscript; SMR and MTD supervised the project. All authors read and approve the final manuscript.

Abstract

Background

Cigarette smoking causes Chronic Obstructive Pulmonary Disease (COPD), the 3rd leading cause of death in the U.S. CFTR ion transport dysfunction has been implicated in COPD pathogenesis, and is associated with chronic bronchitis. However, susceptibility to smoke induced lung injury is variable and the underlying genetic contributors remain unclear. We hypothesized that presence of CFTR mutation heterozygosity may alter susceptibility to cigarette smoke induced CFTR dysfunction. Consequently, COPD patients with chronic bronchitis may have a higher rate of CFTR mutations compared to the general population.

Methods

Primary human bronchial epithelial cells derived from F508del CFTR heterozygotes and mice with (CFTR+/-) and without (CFTR+/+) CFTR heterozygosity were exposed to whole cigarette smoke (WCS); CFTR-dependent ion transport was assessed by Ussing chamber electrophysiology and nasal potential difference measurements, respectively. Caucasians with COPD and chronic bronchitis, age 40 to 80 with FEV1/FVC < 0.70 and FEV1 < 60% predicted, were selected for genetic analysis from participants in the NIH COPD Clinical Research Network’s Azithromycin for Prevention of Exacerbations of COPD in comparison to 32,900 Caucasian women who underwent prenatal genetic testing. Genetic analysis involved an allele-specific genotyping of 89 CFTR mutations.

Results

Exposure to WCS caused a pronounced reduction in CFTR activity in both CFTR (+/+) cells and F508del CFTR (+/-) cells; however, neither the degree of decrement (44.7% wild-type vs. 53.5% F508del heterozygous, P = NS) nor the residual CFTR activity were altered by CFTR heterozygosity. Similarly, WCS caused a marked reduction in CFTR activity measured by NPD in both wild type and CFTR heterozygous mice, but the severity of decrement (91.1% wild type vs. 47.7% CF heterozygous, P = NS) and the residual activity were not significantly affected by CFTR genetic status. Five of 127 (3.9%) COPD patients with chronic bronchitis were heterozygous for CFTR mutations which was not significantly different from controls (4.5%) (P = NS).

Conclusions

The magnitude of WCS induced reductions in CFTR activity was not affected by the presence of CFTR mutation heterozygosity. CFTR mutations do not increase the risk of COPD with chronic bronchitis. CFTR dysfunction due to smoking is primarily an acquired phenomenon and is not affected by the presence of congenital CFTR mutations.
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