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PAPP-A: a possible pathogenic link to the instability of atherosclerotic plaque

Xuping Li1, Qiming Liu, Tao Zhou

  • 1Department of Cardiology, Second Xiangya Hospital, Central South University, Renming Road 359, Changsha, China.

Medical Hypotheses
|August 24, 2007
PubMed

Insights

Pregnancy associated plasma protein A (PAPP-A) may cause atherosclerotic plaque instability, a key factor in acute coronary syndromes (ACS). Targeting PAPP-A could offer a new treatment strategy for ACS patients.

Area of Science:

  • Cardiovascular Medicine
  • Biochemistry
  • Pathology

Background:

  • Acute coronary syndromes (ACS) are primarily caused by the rupture of coronary atherosclerotic plaques and subsequent thrombus formation.
  • Elevated serum concentrations of Pregnancy associated plasma protein A (PAPP-A) are linked to ACS, indicating plaque instability and poor prognosis.
  • The high expression of PAPP-A in unstable plaques remains a puzzling observation.

Purpose of the Study:

  • To investigate the hypothesis that PAPP-A contributes to atherosclerotic plaque instability, playing a role in ACS pathogenesis.
  • To explore PAPP-A as a potential therapeutic target for ACS.

Main Methods:

  • Review of existing studies examining PAPP-A expression in different types of atherosclerotic plaques (eroded, ruptured, stable).
  • Analysis of PAPP-A levels in patients with varying carotid plaque echogenicity (hyperechoic, isoechoic, hypoechoic).

Main Results:

  • PAPP-A is abundantly expressed in eroded and ruptured plaques, but minimally in stable plaques.
  • Higher PAPP-A levels are observed in patients with hyperechoic or isoechoic carotid plaques compared to those with hypoechoic lesions.

Conclusions:

  • PAPP-A expression correlates with atherosclerotic plaque instability.
  • PAPP-A may be a causative factor in plaque instability and ACS.
  • PAPP-A monoclonal antibodies represent a potential novel therapeutic approach for treating ACS.

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