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Mitofusin-2 Regulates Platelet Mitochondria and Function.

Shancy Jacob1, Yasuhiro Kosaka1, Seema Bhatlekar1

  • 1Molecular Medicine Program, (S.J., Y.K., S. Bhatlekar, F.D., H.B., A.M., V.M., E.T., G.H., N.K., B.K.M., B.J.S., K.H., N.D.T., S. Boudina, R.A.C., M.T.R., P.F.B., A.S.W., J.W.R.), University of Utah, Salt Lake City, UT.

Circulation Research
|December 29, 2023
PubMed
Summary
This summary is machine-generated.

Mitofusin-2 (MFN2) is crucial for platelet health, affecting mitochondrial function, lifespan, and bleeding disorders. MFN2 deficiency impacts stroke and lung injury outcomes.

Keywords:
blood plateletsischemic strokemegakaryocytesmitochondrianeutrophils

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Area of Science:

  • Mitochondrial biology and platelet function.
  • Genetics and hematology.

Background:

  • Single-nucleotide polymorphisms (SNPs) in the mitofusin-2 (MFN2) gene are linked to reduced platelet MFN2 expression and lower platelet counts.
  • The MFN2 gene encodes a mitochondrial fusion protein vital for cellular processes.

Purpose of the Study:

  • To investigate the role of MFN2 in megakaryocyte and platelet biology.
  • To understand how MFN2 variants influence platelet function and disease.

Main Methods:

  • Generated mice with megakaryocyte/platelet-specific MFN2 deletion (Mfn2-/-).
  • Isolated human megakaryocytes and platelets from individuals with specific MFN2 genotypes.
  • Assessed mitochondrial morphology, function, and platelet activation ex vivo and in vivo.

Main Results:

  • Mfn2 deficiency led to fragmented mitochondria in megakaryocytes and altered platelet function, including reduced mitochondrial membrane potential and increased phosphatidylserine exposure.
  • Mfn2-/- mice exhibited reduced platelet counts, shorter platelet lifespan, prolonged bleeding times, and altered stroke and acute lung injury outcomes.
  • Human platelets with the T/T genotype for rs1474868 showed reduced MFN2 protein and impaired mitochondrial function.

Conclusions:

  • MFN2 plays a critical role in maintaining mitochondrial integrity and function in megakaryocytes and platelets.
  • MFN2 influences platelet lifespan, activation, and contributes to the pathophysiology of stroke and acute lung injury.