Use of stabilized platelets as hemostatic agent
The present invention provides compositions comprising freeze-dried platelets, microparticles, or both for use as a hemostat, such as for treating bleeding or injuries associated with bleeding. It also provides methods of treating injuries or wounds, and methods of causing blood to clot. Likewise, it provides methods of promoting healing of wounds or of healing wounds.
1. A method of treating bleeding in a subject suffering from bleeding, said method comprising administering a composition comprising freeze-dried platelets to the subject, wherein the amount of platelets administered to the subject is sufficient to treat the bleeding, and wherein the freeze-dried platelets are produced by a process consisting essentially of:
obtaining platelet rich plasma,
adding acid citrate dextrose to obtain a pH of about 6.8 in the platelet rich plasma,
centrifuging the platelet rich plasma to obtain a platelet pellet and platelet poor plasma,
isolating the platelet pellet from the platelet poor plasma,
suspending the isolated platelet pellet in a divalent cation free buffer comprising about 5.0 mM glucose, about 50 mM trehalose at about pH 6.8,
incubating the suspension for about 2 hours at about 37° C.,
adding albumin or Ficoll® to the suspension to a final concentration of about 5% w/v,
lyophilizing the suspension without immersing the suspension in liquid nitrogen, and
wherein the process does not include contacting the platelets with a platelet inhibitor.
2. The method of claim 1 , wherein said administering comprises applying freeze-dried platelets or a composition comprising freeze-dried platelets directly to the site of bleeding.
3. The method of claim 1 , wherein the bleeding is from a high-pressure artery.
4. The method of claim 1 , further comprising rehydrating the freeze-dried platelets before administering them.
5. The method of claim 1 , wherein said administering comprises injecting or infusing freeze-dried platelets or a composition comprising freeze-dried platelets into the blood system of the subject.
6. The method of claim 5 , further comprising rehydrating the freeze-dried platelets before administering them.
7. The method of claim 1 , wherein the method is a method of treating acute bleeding.
8. The method of claim 7 , wherein the bleeding is due to a wound or trauma.
9. The method of claim 1 , wherein the method is a method of treating a bleeding disorder.
10. The method of claim 9 , wherein the bleeding disorder is hemophilia.
11. The method of claim 9 , wherein the bleeding disorder is a side-effect of a treatment regimen for a disease or disorder other than a bleeding disease or disorder.
12. The method of claim 11 , wherein the bleeding disorder is a side-effect of an anti-cancer treatment.
13. The method of claim 1 , wherein the bleeding is due to surgery.