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Albumin-Bound Fatty Acids Modulate Endogenous Angiotensin-Converting Enzyme (ACE) Inhibition.

Enikő Edit Enyedi1,2, Attila Ádám Szabó1,2, Tamás Bence Pintér1,2

  • 1Division of Clinical Physiology, Department of Cardiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary.

Biomedicines
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Summary
This summary is machine-generated.

Human serum albumin (HSA) concentration correlates with angiotensin-converting enzyme (ACE) inhibition. HSA-bound free fatty acids (FFAs) modulate this inhibition, impacting cardiovascular disease risk.

Keywords:
ACE inhibitionFFAHSANEFARAAS modulationalbumin–fatty acid bindingangiotensin-converting enzymefree fatty acidhuman serum albuminnon-esterified fatty acidrenin–angiotensin–aldosterone system

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Area of Science:

  • Biochemistry
  • Cardiovascular Physiology

Background:

  • Human serum albumin (HSA) is a key endogenous inhibitor of angiotensin-converting enzyme (ACE).
  • HSA's transport of free fatty acids (FFAs) may influence its ACE inhibitory capacity and cardiovascular disease (CV) risk.
  • The renin-angiotensin-aldosterone system (RAAS) activity is fine-tuned by ACE, influencing CV health.

Purpose of the Study:

  • To test if the composition of HSA-bound FFAs determines the magnitude of endogenous ACE inhibition.
  • To investigate the relationship between HSA concentration, FFA composition, and ACE inhibition in patients.
  • To elucidate the in vitro effects of FFAs on HSA's ACE inhibitory activity.

Main Methods:

  • Quantified endogenous ACE inhibition in clinical patients (n=161).
  • Assessed the effect of FFA concentration on ACE inhibition (n=101).
  • Measured the impact of FFAs (saturated, monounsaturated, polyunsaturated) and FFA-free HSA on recombinant and tissue ACE.

Main Results:

  • Stronger endogenous ACE inhibition correlated with higher serum HSA concentrations (rho=0.422, p<0.001).
  • Total FFA concentration showed no association with endogenous ACE inhibition (rho=0.088, p=0.38).
  • Removal of FFAs significantly worsened HSA's ACE inhibitory effect (IC50 increased from 7.84 to 23.24 g/L).
  • Specific FFAs, including stearic, alpha-linolenic, and gamma-linolenic acids, enhanced HSA's ACE inhibitory capacity.

Conclusions:

  • Serum HSA concentration is linked to endogenous ACE inhibition.
  • HSA-bound FFAs modulate HSA-mediated ACE inhibition.
  • This mechanism involving FFAs and HSA may be relevant to cardiovascular physiology and disease.