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SARS-CoV-2 Spike S1 Subunit Triggers Pericyte and Microvascular Dysfunction in Human Pancreatic Islets.

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The SARS-CoV-2 spike protein constricts human islet capillaries by activating pericytes, leading to potential vascular dysfunction and diabetes risk in COVID-19 patients. This research clarifies the link between viral infection and metabolic disruption.

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Area of Science:

  • Endocrinology
  • Vascular Biology
  • Virology

Background:

  • COVID-19's impact on metabolic and vascular systems is not fully understood.
  • SARS-CoV-2 may disrupt vascular homeostasis, particularly in the pancreatic islet.
  • Mechanisms linking SARS-CoV-2 infection to islet dysfunction require elucidation.

Purpose of the Study:

  • To investigate the effects of SARS-CoV-2 spike S1 protein on human islet microvascular function.
  • To explore the role of pericytes and the renin-angiotensin system in SARS-CoV-2-induced islet changes.

Main Methods:

  • Confocal microscopy on living pancreas slices from organ donors.
  • Incubation with recombinant SARS-CoV-2 spike S1 protein.
  • Analysis of pericyte activation, capillary diameter, and ACE2 expression.

Main Results:

  • SARS-CoV-2 spike S1 protein activates human islet pericytes.
  • The protein induces capillary constriction within the islets.
  • This occurs due to loss of ACE2 from pericytes, impairing its function and increasing angiotensin II.

Conclusions:

  • Islet pericyte dysfunction is a potential mechanism for COVID-19-associated diabetes.
  • SARS-CoV-2 disrupts the pancreatic renin-angiotensin system.
  • Findings offer insights into COVID-19's vascular and metabolic effects.