Neurons Express Hemoglobin Alpha- and Beta-chains in Rat and Human Brains

Overview

Journal J Comp Neurol

Specialty Neurology

Date 2009 May 30

PMID 19479992

Citations 111

Authors

Franziska Richter

Bernhard H Meurers

Chunni Zhu

Vera P Medvedeva

Marie-Francoise Chesselet

Affiliations

Soon will be listed here.

Abstract

Hemoglobin is the oxygen carrier in vertebrate blood erythrocytes. Here we report that hemoglobin chains are expressed in mammalian brain neurons and are regulated by a mitochondrial toxin. Transcriptome analyses of laser-capture microdissected nigral dopaminergic neurons in rats and striatal neurons in mice revealed the presence of hemoglobin alpha, adult chain 2 (Hba-a2) and hemoglobin beta (Hbb) transcripts, whereas other erythroid markers were not detected. Quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) analysis confirmed the expression of Hba-a2 and Hbb in nigral dopaminergic neurons, striatal gamma-aminobutyric acid (GABA)ergic neurons, and cortical pyramidal neurons in rats. Combined in situ hybridization histochemistry and immunohistochemistry with the neuronal marker neuronal nuclear antigen (NeuN) in rat brain further confirmed the presence of hemoglobin mRNAs in neurons. Immunohistochemistry identified hemoglobin alpha- and beta-chains in both rat and human brains, and hemoglobin proteins were detected by Western blotting in whole rat brain tissue as well as in cultures of mesencephalic neurons, further excluding the possibility of blood contamination. Systemic administration of the mitochondrial inhibitor rotenone (2 mg/kg/d, 7d, s.c.) induced a marked decrease in Hba-a2 and Hbb but not neuroglobin or cytoglobin mRNA in transcriptome analyses of nigral dopaminergic neurons. Quantitative RT-PCR confirmed the transcriptional downregulation of Hba-a2 and Hbb in nigral, striatal, and cortical neurons. Thus, hemoglobin chains are expressed in neurons and are regulated by treatments that affect mitochondria, opening up the possibility that they may play a novel role in neuronal function and response to injury.

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