초록

The present invention relates to methods for encapsulating pancreatic progenitors in a biocompatible semi-permeable encapsulating device. The present invention also relates to production of human insulin in a mammal in response to glucose stimulation.

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1. A method for producing insulin in vivo in a mammal, said method comprising: (a) providing an in vitro human pancreatic and duodenal homeobox gene 1 (PDX1)-positive pancreatic progenitor cell population into an implantable semi-permeable device, wherein the semi-permeable device comprises a first

1. A method for producing insulin in vivo in a mammal, said method comprising: (a) providing an in vitro human pancreatic and duodenal homeobox gene 1 (PDX1)-positive pancreatic progenitor cell population into an implantable semi-permeable device, wherein the semi-permeable device comprises a first seal at a peripheral edge of the semi-permeable device, thereby forming at least one chamber for encapsulating living cells, and at least a second seal which effectively reduces the volume of the encapsulating chamber;(b) implanting the device containing the progenitor cell population into a mammalian host; and(c) maturing the progenitor cell population in said device in vivo such that there is no cell-to-cell contact between the progenitor cell within the device and the host cell in the mammal and the resulting cell population comprises endocrine and acinar cells, wherein at least some of the endocrine cells are insulin secreting cells that produce insulin in response to glucose stimulation in vivo, thereby producing insulin in vivo to the mammal. 2. The method of claim 1, further comprising maturing PDX1-positive pancreatic progenitor cells to acinar or duct cells. 3. The method of claim 1, wherein the device is first prevascularized by implanting in the mammal before introducing progenitor cells. 4. The method of claim 1, wherein the device comprises a plurality of welds for maximizing surface area to volume ratio of the human PDX1-positive pancreatic progenitor cell population in the device. 5. The method of claim 1, wherein the device comprises a plurality of welds to increase vascularization by the host. 6. The method of claim 1, wherein the device is refillable. 7. The method of claim 1, wherein the device is expandable. 8. The method of claim 1, wherein the in vivo cell population is monitored. 9. The method of claim 1, wherein greater than 25 pM of insulin is detectable in the serum of the mammal post glucose-stimulation. 10. The method of claim 1, wherein greater than 50 pM of human C-peptide is detectable in the serum of the mammal post glucose-stimulation. 11. The method of claim 1, wherein the mammal is immuno-suppressed. 12. The method of claim 1, wherein providing a human PDX1-positive pancreatic progenitor cell population comprises thawing a cell population. 13. The method of claim 1, wherein providing a human PDX 1-positive pancreatic progenitor cell population further comprises enriching the cell population for PDX1/NKX6.1 co-positive pancreatic progenitor cells. 14. The method of claim 1, wherein providing a human PDX1-positive pancreatic progenitor cell population further comprises enriching the cell population for PDX1/NKX6.1 co-positive pancreatic progenitor cell by contacting the cell population with an antibody that binds to CD142 antigen and enriching for said CD142 binding cells. 15. The semi-permeable device of claim 1, wherein the semi-permeable device comprises a semi-permeable membrane. 16. The semi-permeable membrane of claim 15, wherein the semi-permeable membrane comprises a vascularizing means and nutrient and oxygen exchange means.