Hydrogen ion in blood plasma (H⁺)

Hydrogen ions (H⁺) in blood plasma are not a molecular target in the classical drug discovery sense, such as a receptor, enzyme, or transporter. Instead, H⁺ is a fundamental component of acid-base physiology, serving as the defining ion for blood pH. Plasma hydrogen ion concentration is tightly regulated by three main mechanisms: chemical buffer systems (bicarbonate, proteins, hemoglobin), respiratory regulation of CO₂, and renal control of acid excretion and bicarbonate conservation[2][3][6][7]. Shifts in plasma H⁺ are central to common medical conditions such as acidosis and alkalosis but targeting H⁺ directly is not feasible. Pharmacological interventions affect H⁺ levels indirectly, typically by modifying buffering capacity or renal handling of acids and bases. Therefore, "hydrogen ion in blood plasma" does not refer to a traditional drug target; it is a physiologically regulated entity whose concentration is critical for cell and systemic function. Adjustments to its concentration are managed through broader interventions, not by drugs binding directly to H⁺[2][6][7].

Other names

Proton in plasmaPlasma hydrogen ionH⁺ in plasma

Drugs that modify plasma H⁺ act indirectly, often by shifting buffer equilibria or altering renal excretion of H⁺ or HCO₃⁻[6][7]