Document Detail

Sinonasal epithelial cells synthesize active vitamin D, augmenting host innate immune function.
MedLine Citation:
PMID:  23038277     Owner:  NLM     Status:  Publisher    
BACKGROUND: Vitamin D, long recognized for its role in bone metabolism and calcium homeostasis, has been increasingly shown to augment innate immunity. 1-α-Hydroxylase, the enzyme responsible for the synthesis of active vitamin D, has been shown to have extrarenal expression in multiple cell types, including airway epithelial cells. The purpose of this study is to explore whether sinonasal epithelial cells (SNECs) express 1-α-hydroxylase, allowing for the local production of active vitamin D, thereby augmenting innate immune function. METHODS: Human SNECs were grown in culture and stimulated by inactive vitamin D. Expression of 1-α-hydroxylase was measured by real-time polymerase chain reaction and immunocytochemistry. Active vitamin D production was measured by enzyme-linked immunosorbent assay (ELISA). The expression of cathelicidin, an antimicrobial peptide, was measured by real-time polymerase chain reaction and immunocytochemistry. RESULTS: SNECs constitutively express the enzyme 1-α-hydroxylase resulting in active vitamin D production. SNECs exposed to inactive vitamin D had a significant 8-fold increase in cathelicidin expression when compared to controls. CONCLUSION: SNECs can generate active vitamin D, which significantly increases expression of the antimicrobial peptide cathelicidin.
Babar Sultan; Murugappan Ramanathan; Joan Lee; Lindsey May; Andrew P Lane
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-4
Journal Detail:
Title:  International forum of allergy & rhinology     Volume:  -     ISSN:  2042-6984     ISO Abbreviation:  Int Forum Allergy Rhinol     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101550261     Medline TA:  Int Forum Allergy Rhinol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 ARS-AAOA, LLC.
Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD.
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