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Divergent Dimethylarginine Dimethylaminohydrolase Isoenzyme Expression in the Central Nervous System
Alena A Kozlova1,2, Vinitha N Ragavan3,4, Natalia Jarzebska3,5
1Department of Psychiatry and Psychotherapy, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
Abstract:
The endogenous methylated derivative of ʟ-arginine, Nω,Nω'-dimethyl-ʟ-arginine (asymmetric dimethylarginine, ADMA), an independent risk factor in many diseases, inhibits the activity of nitric oxide synthases and, consequently, modulates the availability of nitric oxide. While most studies on the biological role of ADMA have focused on endothelial and inducible nitric oxide synthases modulation and its contribution to cardiovascular, metabolic, and renal diseases, a role in regulating neuronal nitric oxide synthases and pathologies of the central nervous system is less understood. The two isoforms of dimethylarginine dimethylaminohydrolase (DDAH), DDAH1 and DDAH2, are thought to be the main enzymes responsible for ADMA catabolism. A current impediment is limited knowledge on specific tissue and cellular distribution of DDAH enzymes within the brain. In this study, we provide a detailed characterization of the regional and cellular distribution of DDAH1 and DDAH2 proteins in the adult murine and human brain. Immunohistochemical analysis showed a wide distribution of DDAH1, mapping to multiple cell types, while DDAH2 was detected in a limited number of brain regions and exclusively in neurons. Our results provide key information for the investigation of the pathophysiological roles of the ADMA/DDAH system in neuropsychiatric diseases and pave the way for the development of novel selective therapeutic approaches.
Insights
Asymmetric dimethylarginine (ADMA) impacts brain nitric oxide signaling. This study maps dimethylarginine dimethylaminohydrolase (DDAH) enzymes in the brain, revealing distinct distributions crucial for understanding neurological diseases.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Asymmetric dimethylarginine (ADMA), a methylated derivative of L-arginine, modulates nitric oxide (NO) availability by inhibiting nitric oxide synthases (NOS).
- While ADMA's role in cardiovascular and metabolic diseases is established, its impact on the central nervous system and neuronal NOS (nNOS) is less understood.
- Dimethylarginine dimethylaminohydrolase (DDAH) enzymes, specifically DDAH1 and DDAH2, are key to ADMA metabolism, but their brain distribution remains largely uncharacterized.
Purpose of the Study:
- To comprehensively map the regional and cellular distribution of DDAH1 and DDAH2 proteins in the adult murine and human brain.
- To elucidate the specific localization of these ADMA-catabolizing enzymes within different brain regions and cell types.
- To provide foundational data for investigating the ADMA/DDAH system's role in neuropsychiatric disorders.
Main Methods:
- Immunohistochemistry was employed to visualize and quantify DDAH1 and DDAH2 protein expression.
- Analysis was performed on adult murine and human brain tissue samples.
- Detailed mapping of protein distribution across various brain regions and cell populations was conducted.
Main Results:
- DDAH1 exhibited a widespread distribution throughout the brain, detected in multiple cell types.
- DDAH2 showed a more restricted expression pattern, localized exclusively to neurons in specific brain regions.
- These findings highlight differential expression patterns of DDAH isoforms within the brain.
Conclusions:
- The distinct regional and cellular distribution of DDAH1 and DDAH2 provides critical insights into the regulation of ADMA and NO signaling in the brain.
- This study lays the groundwork for future research into the pathophysiological roles of the ADMA/DDAH system in neuropsychiatric diseases.
- Understanding these distributions may facilitate the development of targeted therapeutic strategies for neurological and psychiatric conditions.
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