08/14/2025
In myeloproliferative neoplasms (MPNs), certain immune cells called neutrophils are behaving in unexpected ways.
"This is a really fascinating finding that the neutrophils have this unexpected role in myeloproliferative neoplasms maybe in other inflammatory conditions that are associated also with fibrosis of the tissue." — Dr. Simón Méndez-Ferrer, PhD
Dr. Méndez-Ferrer, funded in part by the MPN Research Foundation’s 2024 MPN Challenge award, led the study recently featured on the cover of Blood. His team uncovered a surprising partnership between two bone marrow cell types: neutrophils and megakaryocytes.
Normally, neutrophils are short-lived defenders, regularly cleared out of circulation to prevent inflammation. But in JAK2V617F-mutated MPNs, these neutrophils resist clearance, overexpress a signal called CD24, and end up being “eaten” by megakaryocytes.
"This abnormal interaction causes inflammation of the megakaryocyte and contributes to the fibrotic process," explains Dr. Méndez-Ferrer.
The major discovery in this new article: blocking the “don’t eat me” CD24 signal in preclinical models restored normal neutrophil clearance, improved blood counts, and prevented the development of myelofibrosis.
Congratulations to every author on this groundbreaking paper. We’re proud to support groundbreaking research from investigators like Dr. Méndez-Ferrer, whose work continues to push the boundaries of MPN science.