Research for Plasma Biomarkers Associated With Fatigue in Thrombocytopenic Patients

Thrombocytopenia is defined as a platelet count below 150×109/L. The mechanisms leading to thrombocytopenia are multiple, and may be linked to :

• reduced platelet production in the bone marrow;
• increased destruction of peripheral platelets;
• increased splenic sequestration. In the event of a vascular breach, platelets contribute to hemostasis by sealing the lesion, thereby stopping bleeding. In thrombocytopenic patients, the best-known clinical signs are excessive mucocutaneous bleeding. Patients with severe thrombocytopenia (< 20×109 /L) may be at risk of life-threatening bleeding (cerebral bleeding).

In the case of autoimmune thrombocytopenia, cognitive disorders have been reported, detected by appropriate questionnaires, the pathophysiological mechanism of which remains unclear. In a study of 1871 patients with thrombocytopenia, 39% of patients in the UK and 22% in the USA reported severe asthenia. Asthenia appears to be related to thrombocytopenia, but the mechanism has not been identified either. Asthenia is a recognized symptom in other autoimmune pathologies, such as primary biliary cirrhosis (autoimmune liver disease), in which asthenia has been shown to be mainly associated with autonomic nervous system dysfunction.

While thrombocytopenia is primarily associated with bleeding risk, at least half of thrombocytopenic patients report fatigue and impaired mental and emotional health and social functioning, even though anemia is corrected and the association with autoimmune disease does not explain fatigue in all thrombocytopenic patients.

The hypothesis is that thrombocytopenia is associated with a decrease in circulating neurotrophic factor levels through reduced platelet granule secretion, which may explain the fatigue.

Inclusion criteria

for patients (adults or minors):

• Patients with constitutional or autoimmune (chronic or persistent ITP with last treatment administration ≥ 3 weeks) thrombocytopenia (platelet count < 150×109/L) already diagnosed
• patient not being treated and not receiving serotonin reuptake inhibitor (SSRI) or norepinephrine (SNRI) or antithrombotic treatments (antiplatelet or anticoagulant) in the 10 days prior to inclusion
• affiliation to social security (beneficiary or assignee)
• patient followed in consultation in one of the recruiting haematology departments
• Patient (or parent) having received a detailed explanation of the research project and having consent by signing the consent form before any research-specific procedure

Inclusion criteria

for healthy volunteers:

• Age- (± 5 years) and sex-matched healthy adult controls
• Non-thrombocytopenic patients and not receiving antithrombotic, SNRI or SSRI therapy or if applicable, last treatment ≥ 10 days
• affiliation to social security (beneficiary or assignee)
• adults who received a detailed explanation of the research project and having consent by signing the consent form before any research-specific procedure

Non inclusion criteria (adults and minors):

• Adult patients under legal protection (guardianship or curatorship) Thrombocytopenic patients treated with antithrombotics, serotonin reuptake inhibitors (SSRIs) or noradrenaline reuptake inhibitors (SNRIs)
• Minor patients weighing less than 20 kg

Non inclusion criteria for healthy adult controls:

• Healthy adult volunteers under legal protection (guardianship, curatorship or safeguard of justice).
• Pregnant women