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Sushil K Mahata1, Manjula Mahata, Maple M Fung

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Catestatin (CST), a peptide inhibiting catecholamine secretion, is deficient in hypertension. Replacing CST in mice with deficient CST expression rescues hypertension, suggesting CST’s critical role in blood pressure regulation.

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Area of Science:

  • Biochemistry
  • Cardiovascular Physiology
  • Neuroendocrinology

Background:

  • Catestatin (CST) is a peptide derived from chromogranin A (CHGA) that inhibits catecholamine secretion.
  • Diminished CST levels are observed in hypertension and its early-onset offspring, suggesting a pathogenic role.

Purpose of the Study:

  • To review the multifaceted roles of CST, including its cardiovascular effects and potential involvement in hypertension.
  • To explore CST variants and their impact on catecholamine secretion and autonomic activity.

Main Methods:

  • Identification and characterization of CST and its human variants.
  • Investigation of CST's effects on catecholamine secretion and cardiovascular function in vitro and in vivo.
  • Utilizing a mouse model (Chga-KO) to study the consequences of CST deficiency and the efficacy of CST replacement therapy.

Main Results:

  • CST potently inhibits nicotinic-cholinergic-stimulated catecholamine secretion.
  • Genetic variants of CST exhibit differential inhibitory potencies.
  • CST deficiency is linked to hypertension, and CST replacement rescues hypertension in Chga-KO mice.
  • CST exerts direct cardiac effects and acts as a vasodilator.
  • CST possesses antimicrobial and antimalarial properties.

Conclusions:

  • CST plays a crucial role in regulating blood pressure and catecholamine secretion.
  • Early deficiency in CST may contribute to the development of hypertension.
  • CST exhibits diverse physiological functions beyond catecholamine inhibition, including cardiovascular and antimicrobial activities.