Why the study?
Diabetes mellitus leads to excessive production of methylglyoxal, but its effects on molecules maintaining membrane potentials and ionic homeostasis were not well understood.
Does methylglyoxal disrupt vascular KATP channels by mRNA destabilization?
Does methylglyoxal disrupt vascular KATP channels by mRNA destabilization?
Methylglyoxal, a reactive carbonyl elevated in diabetes, disrupts vascular KATP channels through mRNA destabilization, potentially impairing vascular tone and K+ homeostasis.
Hypothesis-generating in animal vessels; leaves open whether MGO impairs human vascular KATP channels in diabetes.
Diabetes mellitus is characterized by hyperglycemia, oxidative stress and excessive production of intermediary metabolites including methylglyoxal (MGO), a reactive carbonyl. MGO can readily interact with proteins, lipids and DNA, and cause an imbalance of the cellular antioxidant system leading to carbonyl stress. The effects of MGO can be devastating if the targeted molecules are responsible for the maintenance of membrane potentials and ionic homeostasis. Here we show that MGO disrupts the vascular isoform of ATP-sensitive K+ (KATP) channels by acting on the mRNAs of Kir6.1 and SUR2B subunits thereby regulating vascular tone. Our results show that the 3? untranslated region (UTR) of Kir6.1 mRNA and the coding region of SUR2B mRNA are targeted by MGO causing a disruption of vascular KATP channels. The destabilization of the mRNAs of KATP channel can in turn affect K+ homeostasis of vascular smooth muscles as well as vascular responses to circulating vasodilators and vasoconstrictors.
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Anuhya S. Konduru (2022) studied this question.
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