Heme oxygenase (HO) is a microsomal enzyme that oxidatively cleaves heme, a pro-oxidant, into carbon monoxide and biliverdin. Two heme oxygenase isozymes, termed HO-1 and HO-2, have been identified so far. At the amino acid level, HO-1 and HO-2 are 42% homologous. However, each isozyme is evolutionary highly conserved. HO-1 is the inducible form of the enzyme and is therefore also referred to as stress protein Hsp32. Expression of HO-1 can be induced by a variety of stimuli such as heme, metals, hormones, UV radiation and sulfhydryl depleting agents. In contrast, HO-2 is the constituitive form of the enzyme. It is not inducible by exogeneous stimuli and HO-2 is the most prevalent form in most tissues, except the spleen where HO-1 levels are predominant under normal conditions.
Recommended Dilutions: Western Blot: 0.5-4 µg/ml; in Immunoprecipitation: 20 µg/ml; Immunohistochemistry: 20 µg/ml, frozen section tested
Antigen: Heme Oxygenase-2
Reactivity: Human, Mouse, Rat, Monkey, Hamster