Compositions and methods for reducing traumatic edema of the central nervous system
The invention provides compositions and methods for the treatment and/or reversal of an edema, e.g., including a central nervous system (CNS) edema, e.g., a brain or a spinal edema, edema in a burned or an injured tissue such as skin, or any tissue edema. In alternative embodiments, the invention provides compositions and methods for a direct treatment and reversal of an edema, e.g., CNS, brain or spinal edema, including a membrane transport device, in vitro and in vivo characterization of edema, and the sensitive early optical detection of the edema, e.g., tissue, CNS or cerebral edema.
1. A method for removing water from a traumatically injured central nervous system (CNS) tissue in a subject in a controlled fashion, the method comprising:
exposing a surface of the traumatically injured CNS tissue;
applying agar to the exposed surface of the traumatically injured CNS tissue, wherein the agar is permeable and allows passage of water, and wherein the agar conforms to the tissue to maximize contact area with the tissue,
placing a hollow fiber membrane in contact with the agar, wherein the hollow fiber membrane comprises a semipermeable membrane having a molecular weight cut-off of between about 1 to 60 kilodaltons (kDa) and a lumen; and
flowing or pumping through the lumen a concentrated solution of a globular protein that produces a concentration-dependent osmotic pressure, wherein the globular protein cannot pass through the semi-permeable membrane, wherein the concentrated solution of the globular protein in the hollow fiber induces an osmotic pressure that draws water from the tissue into the agar and then into the hollow fiber membrane, where the water is removed and carried away from the agar and the tissue.
2. The method according to claim 1 , wherein the globular protein is bovine serum albumin (BSA).
3. The method according to claim 1 , wherein the hollow fiber membrane comprises a material selected from the group consisting of polynephron, polyflux, polysulfone and regenerated cellulose.
4. The method according to claim 1 , wherein the hollow fiber membrane is regenerated cellulose and the globular protein is BSA.
5. The method according to claim 2 , wherein the BSA is at a concentration of about 350 g/l.
6. The method according to claim 1 , wherein the CNS tissue is a spinal tissue or a brain tissue.
7. The method according to claim 1 , wherein the hollow fiber membrane is embedded within the agar.
8. The method according to claim 1 , wherein a rate of flowing or pumping of the concentrated solution through the semi-permeable hollow fiber membrane is controlled to allow fluid from the tissue to flow up to the membrane device due to osmotic pressure.
9. The method according to claim 1 , wherein the hollow fiber conforms to the surface of the traumatically injured CNS tissue.
10. The method according to claim 1 , wherein an amount of the globular protein that cannot pass through the semi-permeable membrane is changed or modified to alter the rate of water removal.
11. The method according to claim 1 , wherein a concentration of the globular protein that cannot pass through the semi-permeable membrane is altered to between about 0.1 to about 50% to alter the rate of water removal.
12. The method according to claim 1 , wherein the temperature of the concentrated solution is changed in the range of about 20° C. to about 37° C. to alter the rate of water removal.
13. The method according to claim 1 , wherein the molecular weight cut-off of the semipermeable membrane of the hollow fiber membrane is between about 1 to 30 kDa.
14. The method according to claim 1 , wherein the traumatically injured central nervous system (CNS) tissue is brain tissue and the surface of the traumatically injured CNS tissue is exposed by craniotomy or craniectomy.