Regulation of the Cd38 Promoter in Human Airway Smooth Muscle Cells by TNF-alpha and Dexamethasone

Overview

Journal Respir Res

Specialty Pulmonary Medicine

Date 2008 Mar 18

PMID 18341691

Citations 27

Authors

Krishnaswamy G Tirumurugaan

Bit Na Kang

Reynold A Panettieri

Douglas N Foster

Timothy F Walseth

Mathur S Kannan

Affiliations

Soon will be listed here.

Abstract

Background: CD38 is expressed in human airway smooth muscle (HASM) cells, regulates intracellular calcium, and its expression is augmented by tumor necrosis factor alpha (TNF-alpha). CD38 has a role in airway hyperresponsiveness, a hallmark of asthma, since deficient mice develop attenuated airway hyperresponsiveness compared to wild-type mice following intranasal challenges with cytokines such as IL-13 and TNF-alpha. Regulation of CD38 expression in HASM cells involves the transcription factor NF-kappaB, and glucocorticoids inhibit this expression through NF-kappaB-dependent and -independent mechanisms. In this study, we determined whether the transcriptional regulation of CD38 expression in HASM cells involves response elements within the promoter region of this gene.

Methods: We cloned a putative 3 kb promoter fragment of the human cd38 gene into pGL3 basic vector in front of a luciferase reporter gene. Sequence analysis of the putative cd38 promoter region revealed one NF-kappaB and several AP-1 and glucocorticoid response element (GRE) motifs. HASM cells were transfected with the 3 kb promoter, a 1.8 kb truncated promoter that lacks the NF-kappaB and some of the AP-1 sites, or the promoter with mutations of the NF-kappaB and/or AP-1 sites. Using the electrophoretic mobility shift assays, we determined the binding of nuclear proteins to oligonucleotides encoding the putative cd38 NF-kappaB, AP-1, and GRE sites, and the specificity of this binding was confirmed by gel supershift analysis with appropriate antibodies.

Results: TNF-alpha induced a two-fold activation of the 3 kb promoter following its transfection into HASM cells. In cells transfected with the 1.8 kb promoter or promoter constructs lacking NF-kappaB and/or AP-1 sites or in the presence of dexamethasone, there was no induction in the presence of TNF-alpha. The binding of nuclear proteins to oligonucleotides encoding the putative cd38 NF-kappaB site and some of the six AP-1 sites was increased by TNF-alpha, and to some of the putative cd38 GREs by dexamethasone.

Conclusion: The EMSA results and the cd38 promoter-reporter assays confirm the functional role of NF-kappaB, AP-1 and GREs in the cd38 promoter in the transcriptional regulation of CD38.

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