Carbonylation Modification Regulates Na/K-ATPase Signaling and Salt Sensitivity: A Review and a Hypothesis

Area of Science:

• Physiology
• Biochemistry
• Nephrology

Background:

• Na/K-ATPase signaling is crucial in physiological and pathophysiological states.
• Oxidative stress influences Na/K-ATPase activity, signaling, and function.
• Reactive oxygen species (ROS) are involved in cardiotonic steroid (CTS)-mediated signaling.

Purpose of the Study:

• To review the biphasic effects of ROS on Na/K-ATPase signaling.
• To evaluate the role of ROS-mediated carbonylation in renal proximal tubule (RPT) sodium reabsorption.
• To understand the regulation of pump signaling and transcellular sodium transport.

Main Methods:

• Literature review of oxidative stress and Na/K-ATPase signaling.
• Analysis of ROS-induced changes in Na/K-ATPase α1 subunit carbonylation.
• Examination of effects on transcellular sodium transport and urinary sodium excretion.

Main Results:

• ROS exhibit biphasic effects on Na/K-ATPase signaling and sodium excretion.
• Site-specific carbonylation of Na/K-ATPase α1 subunit is key in RPT signaling.
• Overstimulation by ROS leads to blunted signaling and altered sodium excretion.

Conclusions:

• ROS-mediated carbonylation of Na/K-ATPase plays a critical role in RPT function.
• Understanding these biphasic effects is vital for renal physiology and pathophysiology.
• This review highlights the complex interplay between oxidative stress and sodium handling.