The most frequent manifestations of sickle cell disorders are anemia and pain episodes. The episodic exacerbation of pain, often called "crises," is unpredictable and may occur often in some patients.
The only drug presently approved for the treatment of sickle cell disease is hydroxyurea, which has been shown to reduce the frequency of painful episodes.
Parise emphasized the need for further study. "We did not test this drug in patients who are in crisis, and we cannot recommend that doctors prescribe this drug for sickle cell patients at this time," she said.
The results of the study were published online (Oct. 6) in the British Journal of Haematology.
The researchers gave intravenous infusions of eptifibatide (brand name Integrilin) to four patients with sickle cell anemia who were not experiencing pain episodes. "They did well clinically. They did not experience any deleterious changes in their blood tests or have a pain episode," said coauthor Dr. Kenneth I. Ataga, assistant professor of medicine at UNC-Chapel Hill.
In the current study, blood tests showed that while the patients' liver, kidney and other functions remained at baseline, several indicators of inflammation decreased, including levels of a protein called CD40L known to play a role in inflammation and in blood clotting.
Previous studies conducted by Sheritha Lee a graduate student in Parise's lab showed that patients with sickle cell disease have CD40L levels that are as much as 30 times higher than in patients without the disease. Eptifibatide's known ability to decrease CD40L led the researchers to study whether the drug might help sickle cell patients.