Rhinitis, sinusitis, and upper airway disease
Cigarette smoke exposure is associated with vitamin D3 deficiencies in patients with chronic rhinosinusitis

https://doi.org/10.1016/j.jaci.2014.01.039Get rights and content

Background

Cigarette smoke (CS) plays a role in the exacerbation of chronic rhinosinusitis (CRS); however, the mechanism for this is unknown. We hypothesize that CS impairs human sinonasal epithelial cell (HSNEC) conversion of 25(OH)D3 (25VD3) to 1,25-dihydroxyvitamin D3 (1,25VD3) and, furthermore, that supplementation with 1,25VD3 will reverse smoke-induced inflammatory responses by HSNECs.

Objective

We sought to determine the effect of CS on vitamin D3 (VD3) levels, conversion, and regulation of CS-induced inflammation in control subjects and patients with CRS.

Methods

Blood and sinus tissue explants were collected at the time of surgery from control subjects, patients with chronic rhinosinusitis without nasal polyps, and patients with chronic sinusitis with nasal polyps (CRSwNP). Expression of VD3 metabolizing enzymes were measured by using RT-PCR. Primary HSNECs were cultured from tissue explants. 25VD3 with and without cigarette smoke extract (CSE) was used to examine conversion of 25VD3 to 1,25VD3, as well as HSNEC production of proinflammatory cytokines.

Results

CS exposure was associated with reduced circulating and sinonasal 25VD3 levels in all groups compared with those seen in CS-naive, disease-matched counterparts. CS exposure decreased expression of CYP27B1 and was especially pronounced in patients with CRSwNP. CSE impairs control HSNEC conversion of 25VD3. HSNECs from patients with CRSwNP also demonstrate an intrinsic reduction in conversion of 25VD3 to 1,25VD3. Exogenous 1,25VD3 reduces CSE-induced cytokine production by HSNECs.

Conclusions

Exposure to CS is associated with reduced 25VD3 levels and an impaired ability of HSNECs to convert 25VD3 to 1,25VD3. Addition of 1,25VD3 reduces the proinflammatory effects of CS on HSNECs. Impaired VD3 conversion by CS exposure represents a novel mechanism through which CS induces its proinflammatory effects.

Section snippets

Patients

The Institutional Review Board at the Medical University of South Carolina approved these studies, and written informed consent was obtained for all patients. Blood, hair, and sinus tissue were taken at the time of endoscopic sinus surgery. Inclusion criteria include patients with CRSsNP and those with CRSwNP who met the diagnostic criteria outlined by the European Position Paper on Rhinosinusitis and Nasal Polyps 2012.32 Control subjects were undergoing surgery for cerebrospinal fluid leak

CS exposure is associated with decreased circulating and sinonasal tissue 25VD3 levels

To determine the effect of CS on systemic VD3 levels, we measured plasma 25VD3 levels in smoke-naive and CS-exposed control subjects, patients with CRSsNP, and patients with CRSwNP (demographics are summarized in Table I). Consistent with our previous reports,30, 31 patients with CRSwNP were VD3 deficient (Fig 1, A) and had reduced plasma 25VD3 levels compared with those in control subjects (P = .0001) or patients with CRSsNP (P < .0001). Exposure to CS was associated with decreased 25VD3

Discussion

In this study we examined the effect of CS on systemic 25VD3 levels and its local metabolism in control subjects and patients with CRS. Previously, we reported that patients with CRSwNP were systemically VD3 deficient, as determined by using ELISA and liquid chromatography/tandem mass spectrometry30, 31; comparison of these results found no statistically significant difference between data obtained with either method. Here we determined that CS exposure exacerbates local and systemic VD3

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    Supported by grants from the Flight Attendant Medical Research Institute (092401 to J.K.M. and 113039 to R.J.S.), the National Institutes of Health (R01HL091944 to C.A.), and a grant from the Department of Veterans Affairs.

    Disclosure of potential conflict of interest: J. K. Mulligan has received research support from the Flight Attendant Medical Research Institute, the US Department of Veterans Affairs, and the National Institutes of Health. R. J. Schlosser has received research support from the Flight Attendant Medical Research Institute, the US Department of Veterans Affairs, NeilMed, ArthroCare, Intersect, and Optinose; has consultant arrangements with BrainLAB, Olympus, and United Allergy; has received payment for lectures from NeilMed; and has a patent pending for vitamin D use in respiratory tract disorders. The rest of the authors declare that they have no relevant conflicts of interest.

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