Document Type

Journal Article

Department/Unit

Department of Biology

Title

Eel osmotic stress transcriptional factor 1 (Ostf1) is highly expressed in gill mitochondria-rich cells, where ERK phosphorylated

Language

English

Abstract

Background: Osmotic stress transcriptional factor 1 (Ostf1) was firstly identified in tilapia in 2005. Then numerous studies have investigated its regulation and expression profile in fish gill tissues in related to osmoregulation. Generally, hyperosmotic stress induced ostf1 mRNA expression level, however there is no report studying the cellular localization of Ostf1 expression in any osmoregulatory tissue. In this study immunohistochemical (IHC) approach was used to study the cellular localization of Ostf1 in gill cells of Japanese eels.Findings: Ostf1 protein was found to be localized in branchial mitochondria-rich/chloride cell (MRC/CC) as revealed by Naα5 and CFTR co-localization. The protein was detectable at day 3 after fresh water to seawater transfer and was mainly localized in MRCs. Moreover, elevated levels of extracellular signal regulated kinase (ERK) phosphorylation was observed at day 3 of the transfer and was co-localized with MRCs.Conclusions: Our data identified Ostf1 expression in gill MRCs. The observation supports the role of Ostf1 in osmosensing and/or osmoregulation in fish gills, particularly its functional relationship with MRCs. The observation of the co-expression of pERK and Ostf1 in MRCs suggests a cross-talk mechanism between the mitogen-activated protein kinases (MAPKs) and Ostf1 in response to hyperosmotic challenge. To summarize, this report has addressed the cellular localization of Ostf1 and provides evidence to illustrate the involvement of Ostf1 and ERK on osmosensing and osmoregulatory function of gill MRCs. © 2012 Tse et al; licensee BioMed Central Ltd.

Keywords

Immunohistochemical staining, Mitochondria-rich cells, Osmotic stress transcriptional factor 1

Publication Date

2012

Source Publication Title

Frontiers in Zoology

Volume

9

Issue

3

Start Page

1

End Page

5

Publisher

BioMed Central

DOI

10.1186/1742-9994-9-3

Link to Publisher's Edition

http://dx.doi.org/10.1186/1742-9994-9-3

ISSN (print)

17429994

ISSN (electronic)

17429994

This document is currently not available here.

Share

COinS