Inflammatory Response to Hydroxyurea Therapy in Sickle Cell Disease

• Status: Completed
• Trial end date: 2012-11-01
• Target enrollment: 0
• Participant gender: All

Summary

In sickle cell disease (SCD), polymerisation of haemoglobin S and the resulting shape change of the red blood cells (RBC) lead to vascular occlusion and severe painful crises. Permanent inflammatory state and abnormal RBC adhesion to the endothelium trigger these phenomenon. Hydroxyurea (HU) is the only drug that has been shown to reduce clinical severity of SCD, and this was initially attributed to the stimulation of foetal haemoglobin (HbF). However, the clinical response does not correlate consistently with the degree and time of HbF increment, suggesting that HU clinical benefits may involve other mechanisms such as the induction of natural anti-inflammatory response via the hypothalami-pituitary-adrenal axis.

• Accepts Healthy Volunteers?: Accepts Healthy Volunteers

Details

• Lead Sponsor: Assistance Publique - Hôpitaux de Paris
• Treatments: Hydroxyurea

Criteria

INCLUSION CRITERIA:

1. Homozygous SS sickle cell children, aged > 3 years, of sub-Saharian Africa extraction, in a steady-state of disease (free of any infectious or vaso-occlusive events for the 4 weeks prior to and 2 weeks after blood sampling, and transfusion-free for 4 months prior to blood sampling), taken no drug except penicillin-V, folate or iron supplementation, hydroxyurea, divided into three groups :

• children treated with hydroxyurea 20-25 mg/kg/day since at least 3 months with clinical efficacy on vaso-occlusive events

• untreated children with major vaso-occlusive events

• children > 5 year-old without a history of vaso-occlusive events Signed informed consent obtained from the subjects (if possible) and their parents

2. Controls : heterozygous AS parents or siblings of the patients, and AA siblings or healthy African unrelated subjects, aged > 3 years, taken no drug on the day of blood sampling.

Signed informed consent obtained from the subjects (if possible) and their parents

EXCLUSION CRITERIA:

• Children in a acute-phase of the disease

• Parent's or patient's refusal

• Taking any drug except penicillin-V, folate or iron supplementation, hydroxyurea

• Un-healthy control or taking drug