BACKGROUND: Methylnicotinamide (MNA) displays vasoprotective activity, however, the regulation of the activity of nicotinamide-N-methyltransferase (NNMT), is largely unknown. We analyze a possible involvement of IL-6 in the activation of NNMT-MNA pathway during an endurance exercise. METHODS: FVB, C57Bl/6J IL6(+/+) and C57Bl/6J IL-6(-/-) mice were subjected to the single bout of endurance exercise consisting of 90 min of swimming. Thereafter, exercise-induced changes in NNMT activity in the liver as well as concomitant changes in the concentration of MNA and its further metabolites in plasma were analyzed. RESULTS: In two strains of mice (FVB and C57Bl/6J IL6(+/+)) 90 min of swimming resulted in approximately 2-3 folds increase in NNMT activity (from 0.14 ± 0.03 to 0.421 ± 0.02 pmol/min/mg, p < 0.05 and from 0.2 ± 0.06 to 0.35 ± 0.07 pmol/min/mg, p < 0.01, respectively) and concomitant increase in the plasma concentration of MNA (from 157 ± 15.06 to 230 ± 16.2 ng/ml, p < 0.01, and from 77.05 ± 14.6 ng/ml to 152.55 ± 58.4 ng/ml; p < 0.01, respectively). However, in C57Bl/6J IL-6(-/-) mice 90 min of swimming did not change liver NNMT activity (from 0.25 ± 0.07 to 0.23 ± 0.06 pmol/min/mg), while MNA concentration in plasma rose approximately two-fold (from 65.3 ± 30.9 ng/ml to 124.8 ± 35.8 ng/ml; p < 0.05). CONCLUSIONS: We demonstrated for the first time that NNMT - MNA pathway is activated by a single bout of endurance exercise. Interestingly, exercise-induced activation of NNMT in the liver involves IL-6, while the rise in MNA concentration in plasma was partially IL-6-independent. Taking into the consideration the pharmacological activity of MNA, IL-6-dependent and IL-6-independent activation of NNMT, may contribute to the exercise capacity. The physiological role of NNMT in the exercise warrant further studies.
BACKGROUND:Methylnicotinamide (MNA) displays vasoprotective activity, however, the regulation of the activity of nicotinamide-N-methyltransferase (NNMT), is largely unknown. We analyze a possible involvement of IL-6 in the activation of NNMT-MNA pathway during an endurance exercise. METHODS: FVB, C57Bl/6J IL6(+/+) and C57Bl/6J IL-6(-/-) mice were subjected to the single bout of endurance exercise consisting of 90 min of swimming. Thereafter, exercise-induced changes in NNMT activity in the liver as well as concomitant changes in the concentration of MNA and its further metabolites in plasma were analyzed. RESULTS: In two strains of mice (FVB and C57Bl/6J IL6(+/+)) 90 min of swimming resulted in approximately 2-3 folds increase in NNMT activity (from 0.14 ± 0.03 to 0.421 ± 0.02 pmol/min/mg, p < 0.05 and from 0.2 ± 0.06 to 0.35 ± 0.07 pmol/min/mg, p < 0.01, respectively) and concomitant increase in the plasma concentration of MNA (from 157 ± 15.06 to 230 ± 16.2 ng/ml, p < 0.01, and from 77.05 ± 14.6 ng/ml to 152.55 ± 58.4 ng/ml; p < 0.01, respectively). However, in C57Bl/6J IL-6(-/-) mice 90 min of swimming did not change liver NNMT activity (from 0.25 ± 0.07 to 0.23 ± 0.06 pmol/min/mg), while MNA concentration in plasma rose approximately two-fold (from 65.3 ± 30.9 ng/ml to 124.8 ± 35.8 ng/ml; p < 0.05). CONCLUSIONS: We demonstrated for the first time that NNMT - MNA pathway is activated by a single bout of endurance exercise. Interestingly, exercise-induced activation of NNMT in the liver involves IL-6, while the rise in MNA concentration in plasma was partially IL-6-independent. Taking into the consideration the pharmacological activity of MNA, IL-6-dependent and IL-6-independent activation of NNMT, may contribute to the exercise capacity. The physiological role of NNMT in the exercise warrant further studies.
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Authors: Kristoffer Ström; David Morales-Alamo; Filip Ottosson; Anna Edlund; Line Hjort; Sine W Jörgensen; Peter Almgren; Yuedan Zhou; Marcos Martin-Rincon; Carl Ekman; Alberto Pérez-López; Ola Ekström; Ismael Perez-Suarez; Markus Mattiasson; Pedro de Pablos-Velasco; Nikolay Oskolkov; Emma Ahlqvist; Nils Wierup; Lena Eliasson; Allan Vaag; Leif Groop; Karin G Stenkula; Céline Fernandez; Jose A L Calbet; Hans-Christer Holmberg; Ola Hansson Journal: Sci Rep Date: 2018-02-14 Impact factor: 4.379
Authors: Marta Wojewoda; Katarzyna Kmiecik; Renée Ventura-Clapier; Dominique Fortin; Marta Onopiuk; Justyna Jakubczyk; Barbara Sitek; Andrzej Fedorowicz; Joanna Majerczak; Karol Kaminski; Stefan Chlopicki; Jerzy Andrzej Zoladz Journal: PLoS One Date: 2014-02-12 Impact factor: 3.240