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Altered thrombopoiesis in spontaneously hypertensive rats
Isaac Rojo1, Diana Millán-Aldaco2, Ruth Rincón-Heredia3
1Laboratorio de Hematobiología, ENMyH, Instituto Politécnico Nacional, Mexico City, Mexico. ihernandezr1405@alumno.ipn.mx.
Scientific Reports
|November 18, 2025
Summary
Hypertension causes thrombocytosis solely through bone marrow platelet production, not in the spleen or lungs. This study questions if lung and bone marrow platelet production mutually regulate via TPO feedback.
Area of Science:
- Cardiovascular Biology
- Hematology
- Hypertension Research
Background:
- Platelet hyperreactivity is a significant risk factor for cardiovascular disease and mortality in hypertensive patients.
- While bone marrow thrombopoiesis is linked to platelet hyperreactivity, extramedullary thrombopoiesis in hypertension is poorly understood.
Purpose of the Study:
- To investigate thrombopoiesis parameters in bone marrow, spleen, and lungs of spontaneously hypertensive rats (SHR) and Wistar Kyoto rats.
- To determine the primary site of thrombocytosis in hypertensive rats.
- To explore potential regulatory mechanisms of thrombopoiesis in hypertension.
Main Methods:
- Quantitative histological imaging of bone marrow, spleen, and lungs.
- Flow cytometry analysis of megakaryocyte and platelet markers (CKIT+/CD41+).
- Enzyme-linked immunoassays for Interleukin-6 (IL6) and Thrombopoietin (TPO) levels.
Main Results:
- Thrombocytosis in SHR rats is attributed exclusively to enhanced bone marrow thrombopoiesis.
- A significant decrease in megakaryocyte and CKIT+/CD41+ cell density was observed in the lungs of SHR rats.
- Bone marrow IL6 levels increased, while TPO levels decreased in both bone marrow and serum of SHR rats.
Conclusions:
- Hypertension-induced thrombocytosis in rats originates solely from the bone marrow.
- Reduced megakaryocyte presence in SHR lungs suggests impaired lung megakaryopoiesis.
- Findings suggest a potential TPO-mediated feedback loop between pulmonary and bone marrow thrombopoiesis, warranting further investigation into platelet biology.
