The overall objective of this project is to understand the molecular basis of two types of monoamine oxidase (MAO A and B) at the gene level. MAO is an important enzyme in catecholamine metabolism. Abnormal levels of MAO activity have been shown in a number of mental disorders. With the full-length human liver MAO A and B cDNAs cloned in this laboratory, the genomic organizations and the expressions of these genes will be investigated. These studies have great importance for both basic and clinical research.
The specific aims of this five-year Research Scientist Award application are described below. Using the established bacterial and mammalian cell expression plasmid vectors, the cloned human liver MAO A and B cDNAs will be expressed and the catalytic properties of the expressed proteins will be characterized. Using Northern blot analysis with MAO A and B cDNA as probes, the correlation among the expressions of these genes at the levels of mRNA, protein and catalytic activities in various human tissues will be examined. This study will indicate whether the tissue specificity of MAO A and B is controlled at the level of transcription or translation. Using Southern blot analysis of cells containing human chromosomes - mouse DNA hybrid as well as in situ hybridization, the chromosomal location of human liver MAO A and B genes will be determined. This fundamental knowledge is essential for studying the role of MA0 genes in mental disorders. The genomic DNAs For MAO A and B will be analyzed. Several human genomic libraries (cosmic and LAMBDA) will be screened using MAO A and B cDNA probes, the genomic DNAs encoding human liver MAO A and B genes will be cloned. The restriction maps of the genomic MAO A and B clones will then be constructed. Further, the MAO A and B genes will be sequenced by the chain termination method, and their promoter regions will be analyzed. The heterogeneity of MAO A and B will be investigated. MAO A, B and related cDNAs will be cloned from other human tissues, and their DNA and amino acid sequences will be compared. Thus, the similarities and differences of MAO A (or B) from various tissues will be clearly understood. This information will provide a conclusive answer on the validity of using platelet MAO B as a marker for brain MAO B and will have significant implications on future clinical studies.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Research Scientist Award (K05)
Project #
1K05MH000796-01
Application #
3075868
Study Section
Research Scientist Development Review Committee (MHK)
Project Start
1989-04-01
Project End
1994-03-31
Budget Start
1989-04-01
Budget End
1990-03-31
Support Year
1
Fiscal Year
1989
Total Cost
Indirect Cost
Name
University of Southern California
Department
Type
Schools of Pharmacy
DUNS #
041544081
City
Los Angeles
State
CA
Country
United States
Zip Code
90033
Holschneider, D P; Scremin, O U; Chialvo, D R et al. (2002) Heart rate dynamics in monoamine oxidase-A- and -B-deficient mice. Am J Physiol Heart Circ Physiol 282:H1751-9
Holschneider, D P; Scremin, O U; Roos, K P et al. (2002) Increased baroreceptor response in mice deficient in monoamine oxidase A and B. Am J Physiol Heart Circ Physiol 282:H964-72
Geha, R M; Rebrin, I; Chen, K et al. (2001) Substrate and inhibitor specificities for human monoamine oxidase A and B are influenced by a single amino acid. J Biol Chem 276:9877-82
Hauptmann, N; Shih, J C (2001) 2-Naphthylamine, a compound found in cigarette smoke, decreases both monoamine oxidase A and B catalytic activity. Life Sci 68:1231-41
Wong, W K; Chen, K; Shih, J C (2001) Regulation of human monoamine oxidase B gene by Sp1 and Sp3. Mol Pharmacol 59:852-9
Rebrin, I; Geha, R M; Chen, K et al. (2001) Effects of carboxyl-terminal truncations on the activity and solubility of human monoamine oxidase B. J Biol Chem 276:29499-506
Fornai, F; Giorgi, F S; Gesi, M et al. (2001) Biochemical effects of the monoamine neurotoxins DSP-4 and MDMA in specific brain regions of MAO-B-deficient mice. Synapse 39:213-21
Holschneider, D P; Chen, K; Seif, I et al. (2001) Biochemical, behavioral, physiologic, and neurodevelopmental changes in mice deficient in monoamine oxidase A or B. Brain Res Bull 56:453-62
Geha, R M; Chen, K; Shih, J C (2000) Phe(208) and Ile(199) in human monoamine oxidase A and B do not determine substrate and inhibitor specificities as in rat. J Neurochem 75:1304-9
Holschneider, D P; Shih, J C (2000) Genotype to phenotype: challenges and opportunities. Int J Dev Neurosci 18:615-8

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