Isolation and Use of Human Regulatory T Cells

1 - 175 . (canceled)

176 . A method of isolating a viable population of regulatory T cells, comprising:

(a) contacting a starting population of cells with a first, second, third, fourth, and fifth reagent, which bind CD4, CD25, CD45RO, CD45RA and CD127, respectively; and

(b) selecting a resulting population of cells that bind to the first, second, and third reagent and do not bind to the fourth or fifth reagent,

to thereby yield an isolated viable population of regulatory T cells, which comprise at least 75% regulatory T cells and less than 25% non-regulatory T cells.

177 . The method of claim 176 , wherein the isolated viable population of regulatory T cells express FoxP3.

178 . The method of claim 176 , wherein the first, second, third, fourth, and fifth reagents comprise antibodies that bind CD4, CD25, CD45RO, CD45RA and CD127, respectively.

179 . The method of claim 176 , wherein the starting population of cells is isolated from peripheral blood, synovial fluid, or tissue.

180 . A method of increasing the percentage of viable regulatory T cells in a starting population of cells comprising:

(a) contacting a starting population of cells with antibodies that bind CD4 and CD25 and selecting a first population of retained cells that bind to said antibodies; and

(b) contacting said first population of retained cells with antibodies that bind CD127 and selecting a second population of retained cells that do not bind to said antibodies; and

(c) contacting said second population of retained cells with antibodies that bind CD45RA and selecting a third population of retained cells that do not bind to said antibodies; or

(d) contacting said second population of retained cells with antibodies that bind CD45RO and selecting a third population of retained cells that bind to said antibodies; and

wherein said third population of retained cells comprise an increased percentage of viable regulatory T cells.

181 . The method of claim 180 , wherein the viable regulatory T cells express FoxP3.

182 . The method of claim 180 , wherein the starting population of cells are derived from peripheral blood, synovial fluid, or tissue.

183 . The method of claim 180 , wherein the percentage of viable regulatory T cells is enriched at least 5-fold.

184 . The method of claim 180 , wherein the percentage of viable regulatory T cells is enriched at least 10-fold.

185 . The method of claim 180 , wherein the percentage of viable regulatory T cells is enriched at least 50-fold.

186 . A method of increasing the percentage of viable regulatory T cells in a starting population of cells comprising:

(a) contacting a starting population of cells with antibodies that bind to one or more of a group of markers on non-CD4+ immune cells; and

(b) selecting a first population of retained cells that do not bind to said antibodies that bind to one or more of a group of markers on non-CD4+ immune cells; and

(c) contacting said first population of retained cells with antibodies that bind CD25 and selecting a second population of retained cells that bind to said antibodies; and

(e) contacting said second population of retained cells with antibodies that bind CD127 and selecting a third population of retained cells that do not bind to said antibodies; and

(f) contacting said third population of retained cells with antibodies that bind CD45RA and selecting a fourth population of retained cells that do not bind to said antibodies; or

(g) contacting said third population of retained cells with antibodies that bind CD45RO and selecting a fourth population of retained cells that bind to said antibodies,

wherein said fourth population of retained cells comprise an increased percentage of viable regulatory T cells.

187 . The method of claim 186 , wherein the starting population of cells are derived from peripheral blood, synovial fluid, or tissue.

188 . The method of claim 186 , wherein the percentage of viable regulatory T cells is enriched at least 5-fold.

189 . The method of claim 186 , wherein the percentage of viable regulatory T cells is enriched at least 10-fold.

190 . The method of claim 186 , wherein the percentage of viable regulatory T cells is enriched at least 50-fold.