Quinone oxidoreductases in protection against myelogenous hyperplasia and benzene toxicity.

Abstract

Quinone oxidoreductases (NQO1 and NQO2) are cytosolic proteins that catalyze metabolic reduction of quinones and its derivatives to protect cells against redox cycling and oxidative stress. In humans, a high percentage of individuals with myeloid and other types of leukemia are homo- and heterozygous for a null mutant allele of NQO1. The NQO2 locus is also highly polymorphic in humans. Recently, we generated NQO1-/- and NQO2-/- mice deficient in NQO1 and NQO2 protein and activity, respectively. These mice showed no detectable developmental abnormalities and were indistinguishable from wild type mice. Interestingly, all the mice lacking expression of NQO1 and NQO2 protein demonstrated myelogenous hyperplasia of the bone marrow and increased granulocytes in the peripheral blood. Decreased apoptosis contributed to myelogenous hyperplasia. The studies on short-term exposure of NQO1-/- mice to benzene demonstrated substantially greater benzene-induced toxicity, as compared to wild type mice.

• Authors: Karim Iskander, Anil K Jaiswal
• Journal: Chemico-biological interactions (Chem Biol Interact) Vol. 153-154 Pg. 147-57 (May 30 2005) ISSN: 0009-2797 [Print] Ireland
• PMID: 15935811 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, U.S. Gov't, P.H.S., Review)

Chemical References

• NAD(P)H Dehydrogenase (Quinone)
• NQO1 protein, human
• NRH - quinone oxidoreductase2
• Quinone Reductases
• Benzene

Topics

• Animals
• Benzene (toxicity)
• Bone Marrow (enzymology, pathology)
• Genetic Predisposition to Disease
• Humans
• Hyperplasia (chemically induced, enzymology, genetics)
• Leukemia (chemically induced, enzymology, genetics)
• Mice
• Mice, Knockout
• Myeloproliferative Disorders (chemically induced, enzymology, genetics)
• NAD(P)H Dehydrogenase (Quinone) (deficiency, genetics, metabolism)
• Polymorphism, Genetic
• Quinone Reductases (deficiency, genetics, metabolism)