alexa Dynamics of Erythropoietic Markers in Response to Hypox
ISSN: 2155-9864

Journal of Blood Disorders & Transfusion
Open Access

Like us on:
OMICS International organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific Societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.

Open Access Journals gaining more Readers and Citations

700 Journals and 15,000,000 Readers Each Journal is getting 25,000+ Readers

This Readership is 10 times more when compared to other Subscription Journals (Source: Google Analytics)

Research Article

Dynamics of Erythropoietic Markers in Response to Hypoxia in Rats

Ying Zhang1,3, Indrajeet Singh1,2 and Wojciech Krzyzanski1*

1 Department of Pharmaceutical Sciences, State University of New York at Buffalo, Buffalo, New York, USA

2 Amgen Inc., Thousand Oaks, CA, USA

3 Clinical Pharmacology & Pharmacometrics, CSL Behring, King of Prussia, PA, USA

*Corresponding Author:
Wojciech Krzyzanski
Department of Pharmaceutical Sciences
State University of New York at Buffalo
Buffalo, New York, USA
E-mail: [email protected]

Received date: December 13, 2013; Accepted date: January 27, 2014; Published date: February 04, 2014

Citation: Zhang Y, Singh I, Krzyzanski W (2014) Dynamics of Erythropoietic Markers in Response to Hypoxia in Rats. J Blood Disord Transfus 5:197. doi: 10.4172/2155-9864.1000197

Copyright: © 2014 Zhang Y, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 

Abstract

Purpose: Erythropoietin (EPO) regulates production of red blood cells in response to hypoxia. Decreased arterial oxygen saturation results in an increased production of EPO in various tissues including kidney as a major stimulation site leading to an increase in EPO plasma levels. This study aims to investigate the relationship between hypoxia and resultant erythropoietic response in rats.

Methods: The in house hypoxia chamber was designed to regulate the fraction of inspired oxygen (FiO2) = 10% supplied to Wistar male rats (N=4) for 6 hours by mixing room air with N2 to maintain air pressure at 1 atm. Plasma and kidney samples were collected at various times during and after exposure to hypoxia. Kidney EPO mRNA, HIF-2α, plasma EPO concentration, reticulocyte counts and hemoglobin were measured. The time course of above markers and fold changes from pre-hypoxia values were used to quantify responses to hypoxia under the normoxic condition.

Results: The arterial oxygen saturation of rats decreased from 95% to 60% during the hypoxia. Hypoxia resulted in 6-fold increase in kidney EPO mRNA expression, 10-fold increase in plasma EPO concentrations and 1.5-fold increase in reticulocytes count. The increase of HIF-2α expression is 2.4 fold after one hour hypoxia and returns below the baseline value after 1.5 hours. The result of DNA binding activity of HIF-2α is quite similar, which increased 1.5 fold at 0.5 hour and then went below baseline.

Conclusion: After 6 hours hypoxia, the observed increase in the levels of kidney EPO mRNA, plasma EPO concentrations and reticulocytes count, and delays in peak response are consistent with times necessary for the stimulation for EPO mRNA transcription, synthesis of plasma EPO, and enhanced release of reticulocytes. The tolerance effect observed in HIF-2α time course implies existence of a counter-regulatory mechanism in a HIF-2α mediated signal for mRNA production.

Keywords

Share This Page

Additional Info

Loading
Loading Please wait..
 
Peer Reviewed Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

 
© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version
adwords