Uridine-5′-triphosphate and Adenosine Triphosphate γS Induce Mucin Secretion Via Ca2+-dependent Pathways in Human Nasal Epithelial Cells

Jae Young Choi, Wan Namkung, Ji Hyun Shin, Joo Heon Yoon

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Objectives - Nucleotides such as adenosine triphosphate (ATP) and uridine-5′-triphosphate (UTP) play fundamental roles in the early stage of secretion in nasal epithelial cells via the P2Y receptor. In this study, we examined the expression pattern of P2Y subtypes and their functions on Ca 2+ influx ([Ca2+]i) in normal human nasal epithelial (NHNE) cells. We also examined the effect of UTP (an agonist for P2Y2) and ATPγS (an agonist for P2Y11) on mucin secretion and mucin gene expression. Material and Methods - The expression pattern of P2Y receptors and the mRNA levels of MUC5AC, MUC5B and MUC8 were examined after treatment with UTP and ATPγS by means of reverse transcriptase polymerase chain reaction. Mucin was quantified by an immunoblotting assay. We measured [Ca2+]i in NHNE cells using a double perfusion chamber. Results - Two uracil-sensitive receptors (P2Y2, P2Y4) and two adenine-selective receptors (P2Y 1, P2Y11) were expressed in NHNE cells. UTP and ATPγS increased [Ca2+]i via caffeine-sensitive pathways, and these two agonists stimulated mucin secretion to a similar magnitude without their gene enhancement. In addition, the mucin stimulatory effects subsided when the intracellular Ca2+ was removed by 2-bis-(2-aminophenoxy)-ethane-N,N,N′,N′-tetraacetic acid-acetoxymethyl ester. Conclusion - This study showed that P2Y2 and P2Y11 receptors were expressed in NHNE cells and that their agonists, UTP and ATPγS, act as secretogogues on mucin secretion via Ca2+-dependent pathways.

Original languageEnglish
Pages (from-to)1080-1086
Number of pages7
JournalActa Oto-Laryngologica
Volume123
Issue number9
DOIs
Publication statusPublished - 2003 Dec 1

All Science Journal Classification (ASJC) codes

  • Otorhinolaryngology

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