PMID: 8468327Feb 1, 1993Paper

Functional analysis of cDNAs for two types of human heme oxygenase and evidence for their separate regulation

Journal of Biochemistry
Shigeki ShibaharaK Endo

Abstract

We cloned a cDNA coding for a putative human heme oxygenase isozyme, designated type 2 (HO-2), and analyzed its function by transient expression assays. HeLa cells transfected with either HO-2 cDNAs or a cDNA coding for authentic heme oxygenase (HO-1) expressed the activity of heme oxygenase, although no activity was detected in the mock transfected cells. Using specific anti-HO-1 antibody, we showed that expression of a HO-1 cDNA resulted in the increase in its protein levels, but HO-1 protein was not detectable in the cells expressing HO-2 cDNAs. We thus confirmed the functional identity of HO-1 and HO-2. Then, we analyzed their expression in an erythroid cell line, YN-1-0-A. Treatment with hemin or by heat shock (42 degrees C) led to a remarkable increase in the HO-1 mRNA levels, while HO-2 mRNA expression was not induced at all, suggesting that they are under separate regulation.

Citations

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