dimethylarginine and sapropterin

dimethylarginine has been researched along with sapropterin* in 2 studies

Other Studies

2 other study(ies) available for dimethylarginine and sapropterin

ArticleYear
Beneficial effects of the active principle component of Korean cabbage kimchi via increasing nitric oxide production and suppressing inflammation in the aorta of apoE knockout mice.
    The British journal of nutrition, 2013, Jan-14, Volume: 109, Issue:1

    The present study investigated the effects of 3'-(4'-hydroxyl-3',5'-dimethoxyphenyl)propionic acid (HDMPPA), the active principle compound of kimchi, on vascular damage in the experimental atherosclerotic animal. HDMPPA was administrated by an intraperitoneal injection of 10 mg/kg per d for 8 weeks to apoE knockout (KO) mice with an atherogenic diet containing 1 % cholesterol, and its effects were compared with vehicle-treated control mice. HDMPPA increased NO content in the aorta, accompanied by a decrease in reactive oxygen species (ROS) concentration. Furthermore, in the HDMPPA-treated group, aortic endothelial NO synthase (eNOS) expression was up-regulated compared with the control group. These results suggested that HDMPPA could maintain NO bioavailability through an increasing eNOS expression and preventing NO degradation by ROS. Furthermore, HDMPPA treatment in apoE KO mice inhibited eNOS uncoupling through an increase in vascular tetrahydrobiopterin content and a decrease in serum asymmetric dimethylarginine levels. Moreover, HDMPPA ameliorates inflammatory-related protein expression in the aorta of apoE KO mice. Therefore, the present study suggests that HDMPPA, the active compound of kimchi, a Korean functional food, may exert its vascular protective effect through the preservation of NO bioavailability and suppression of the inflammatory response.

    Topics: Animals; Anti-Inflammatory Agents, Non-Steroidal; Aorta; Aortitis; Apolipoproteins E; Arginine; Atherosclerosis; Biopterins; Cell Adhesion Molecules; Diet, Atherogenic; Disease Models, Animal; Down-Regulation; Injections, Intraperitoneal; Male; Mice; Mice, Knockout; Nitric Oxide; Nitric Oxide Synthase Type III; Phenyl Ethers; Propionates; Random Allocation; Reactive Oxygen Species; Up-Regulation

2013
Endogenous methylarginines modulate superoxide as well as nitric oxide generation from neuronal nitric-oxide synthase: differences in the effects of monomethyl- and dimethylarginines in the presence and absence of tetrahydrobiopterin.
    The Journal of biological chemistry, 2005, Mar-04, Volume: 280, Issue:9

    The endogenous methylarginines asymmetric dimethylarginine (ADMA) and N(G)-monomethyl-L-arginine (L-NMMA) regulate nitric oxide (NO) production from neuronal NO synthase (nNOS). Under conditions of L-arginine or tetrahydrobiopterin (BH(4)) depletion, nNOS also generates superoxide, O(2)(.); however, the effects of methylarginines on this O(2)(.) generation are poorly understood. Therefore, we measured the dose-dependent effects of ADMA and L-NMMA on the rate and amount of O(2)(.) production from nNOS under conditions of L-arginine and/or BH(4) depletion, using electron paramagnetic resonance spin trapping. In the absence of L-arginine, ADMA (1 microm) inhibited O(2)(.) generation by approximately 60% from a rate of 56 to 23 nmol/mg/min, whereas L-NMMA (0.1-100 microm) had no effect. L-Arginine markedly decreased the observed O(2)(.) adduct formation; however, O(2)(.) generation from the enzyme still occurs at a low rate (12.1 nmol/mg/min). This O(2)(.) leak is NOS-derived as it is not seen in the absence of calcium and calmodulin and demonstrates that O(2)(.) generation from NOS occurs even when normal substrate/ cofactor levels are present. Under conditions of BH(4) depletion, ADMA had no effect on O(2)(.), whereas L-NMMA increased O(2)(.) production almost 3-fold. This O(2)(.) generation was >90% inhibited by imidazole, indicating that it occurred at the heme center. Thus, methylarginines can profoundly shift the balance of NO and O(2)(.) generation from nNOS. These observations have important implications with regard to the therapeutic use of methylarginine-NOS inhibitors in the treatment of disease.

    Topics: Animals; Arginine; Biopterins; Calcium; Calmodulin; Cell Line; Citrulline; Dose-Response Relationship, Drug; Electron Spin Resonance Spectroscopy; Humans; Magnetics; Nitric Oxide Synthase; omega-N-Methylarginine; Oxygen; Rats; Spin Trapping; Superoxides; Time Factors; Transfection

2005