Platelet number and function in response to a single intravenous dose of vincristine.

Vincristine might increase circulating platelet numbers but the functional capacity of these newly released platelets is unknown. To evaluate and compare the functionality of mature and immature (reticulated) platelets after a single intravenous dose of vincristine in dogs. Ten healthy purpose-bred dogs. Dogs prospectively received a single IV injection of 0.02 mg/kg vincristine or 0.9% saline. Before and after treatment on days 3, 5, and 7, platelets (resting and after thrombin stimulation) were assessed by flow cytometric determination of P-selectin (CD62P) expression. Reticulated platelets were distinguished using thiazole orange (TO) staining. Relative to saline, vincristine administration increased platelet count from day 0 to day 7 (225 ± 58 to 273 ± 65 × 103 /μL, vs 299 ± 76.4 to 214 ± 20 × 103 /μL, P = .01) and increased percentage of reticulated platelets from day 0 to day 5 (3.9 ± 1.5% to 6.1 ± 1.6%, P = .02). On all days, reticulated platelets had greater resting expression of CD62P than did mature platelets (49.6 ± 4% vs 10.2 ± 1%, P ≤ .001). Across all days, CD62P expression by reticulated platelets in the vincristine and saline-treated groups was not different when unstimulated (P = .7) or after thrombin stimulation (P = .33). Reticulated platelets released in response to vincristine administration function similarly to mature platelets. © 2021 The Authors. Journal of Veterinary Internal Medicine published by Wiley Periodicals LLC on behalf of American College of Veterinary Internal Medicine.

Citation

Erin C Allen, Jaime L Tarigo, Dana N LeVine, Jamie P Barber, Benjamin M Brainard. Platelet number and function in response to a single intravenous dose of vincristine. Journal of veterinary internal medicine. 2021 Jul;35(4):1754-1762

Mesh Tags

Substances

PMID: 33993531

search → result