Peer-reviewed veterinary case report
Thrombopoietin levels in dogs with immune thrombocytopenia
By Brooks, Marjory B et al.·Published in Journal of veterinary internal medicine·2024·Department of Population Medicine and Diagnostic Sciences, United States·View original on PubMed →
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Original publication title: Plasma concentration of thrombopoietin in dogs with immune thrombocytopenia.
- Species:
- dog
Plain-English summary
A group of dogs with immune thrombocytopenia (ITP), a condition that causes low platelet counts, was studied to understand their blood levels of a protein called thrombopoietin (TPO), which helps produce platelets. Most of the dogs with primary ITP had low TPO levels, indicating that their bodies were not effectively producing platelets. This suggests that treatments aimed at boosting TPO could be beneficial for these dogs, similar to treatments used in humans. The study also developed a new test to measure TPO levels, which could help veterinarians better understand and treat dogs with low platelet counts.
People also search for: dog ITP treatment · low platelet count in dogs · thrombopoietin levels in dogs
Abstract
BACKGROUND: Immune thrombocytopenia (ITP) is a common cause of severe thrombocytopenia in dogs. The pathogenesis of nonassociative, primary ITP (pITP) appears complex, with ill-defined thrombopoietic response. OBJECTIVES: Develop an immunoassay to measure plasma canine thrombopoietin (TPO) concentration and characterize TPO concentrations in dogs with pITP. ANIMALS: Forty-one healthy dogs, 8 dogs in an induced ITP model (3 control, 5 ITP), and 58 pITP dogs. METHODS: Recombinant canine TPO (rcTPO) was purchased and its identity confirmed by mass spectrometry. Monoclonal antibodies were raised to rcTPO and used to configure a sandwich ELISA using streptavidin-biotin detection. Assay performance, coefficients of variability, and healthy dog plasma TPO reference interval (RI) were determined, followed by assay of ITP samples. RESULTS: Assay dynamic range was 15 pg/mL (lower limit of detection) to 1000 pg/mL TPO, with limit of quantitation of 62 pg/mL. Plasma TPO RI was 0 to 158 pg/mL, with plasma TPO <62 pg/mL for 35/41 healthy dogs. All dogs with induced ITP developed marked increases in plasma TPO concentration. Peak values ranged from 515 to >6000 pg/mL. In contrast, only 2/58 pITP dogs had TPO values above RI. CONCLUSIONS AND CLINICAL IMPORTANCE: Plasma TPO concentration is paradoxically low at diagnosis for most dogs with pITP. This finding suggests that ineffective thrombopoiesis contributes to thrombocytopenia in pITP dogs and supports evaluating TPO receptor agonist treatment as used for pITP in humans. The TPO assay provides a new tool to study thrombopoiesis in pITP and other thrombocytopenic syndromes in dogs.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/39143652/