Universal donor stem cells and related methods

Patent metadata

Field	Value
Publication number	US-11492591-B2
Application number	US-202117497927-A
Country	US
Kind code	B2
Filing date	Oct 9, 2021
Priority date	May 8, 2015
Publication date	Nov 8, 2022
Grant date	Nov 8, 2022

Abstract

Disclosed herein are universal donor stem cells and related methods of their use and production. The universal donor stem cells disclosed herein are useful for overcoming the immune rejection in cell-based transplantation therapies. In certain embodiments, the universal donor stem cells disclosed herein do not express one or more MHC-I and MHC-II human leukocyte antigens. Similarly, in certain embodiments, the universal donor stem cells disclosed herein do not express one or more human leukocyte antigens (e.g., HLA-A, HLA-B and/or HLA-C) corresponding to MHC-I and MHC-II human leukocyte antigens, thereby rendering such cells hypoimmunogenic.

First claim

What is claimed is:

1. An isolated T cell comprising reduced expression of MHC-I and MHC-II human leukocyte antigens (HLA) relative to a wild-type cell of the same cell type and increased expression of a tolerogenic factor relative to the wild-type cell of the same cell type,
wherein the MHC-I human leukocyte antigens are HLA-A, HLA-B, and HLA-C,
wherein the MHC-II human leukocyte antigens are HLA-DP, HLA-DQ, and HLA-DR, and
wherein the tolerogenic factor is CD47.

2. The isolated T cell of claim 1 , wherein the reduced expression of the MHC-I human leukocyte antigens results from the MHC-I human leukocyte antigens being deleted from at least one allele of the isolated T cell.

3. The isolated T cell of claim 1 , wherein the reduced expression of the MHC-II human leukocyte antigens results from one or more indels being introduced into class II major histocompatibility complex transactivator (CIITA).

4. The isolated T cell of claim 1 , further comprising reduced expression of CIITA.

5. The isolated T cell of claim 1 , wherein the tolerogenic factor is inserted into a safe harbor locus of at least one allele of the isolated T cell.

6. The isolated T cell of claim 5 , wherein the safe harbor locus comprises an AAVS1 locus.

7. The isolated T cell of claim 1 , wherein the tolerogenic factor inhibits immune rejection.

8. The isolated T cell of claim 1 , wherein the isolated T cell does not express HLA-A, HLA-B, and HLA-C.

9. The isolated T cell of claim 1 , wherein the isolated T cell does not express HLA-DP, HLA-DQ, and HLA-DR.

10. The isolated T cell of claim 1 , wherein the isolated T cell does not express CIITA.

11. The isolated T cell of claim 1 , wherein the isolated T cell further comprises an additional tolerogenic factor selected from the group consisting of HLA-G and PD-L1.

12. The T isolated cell of claim 1 , wherein the isolated T cell is a primary T cell.

13. An isolated T cell that does not express HLA-A, HLA-B, HLA-C, HLA-DP, HLA-DQ, and HLA-DR and expresses CD47.

14. The isolated T cell of claim 13 , wherein the isolated T cell is a CIITA indel/indel , HLA-A−, HLA-B −/− , and HLA-C −/− isolated T cell.

15. The isolated T cell of claim 1 , wherein the reduced expression of the MHC-I human leukocyte antigens results from one or more indels being introduced into β-2 microglobulin (B2M).

16. The isolated T cell of claim 1 , further comprising reduced expression of B2M.

17. The isolated T cell of claim 1 , wherein the isolated T cell does not express B2M.

18. The isolated T cell of claim 13 , wherein the isolated T cell is a B2M −/− , CIITA −/− isolated T cell.

19. The isolated T cell of claim 13 , wherein the isolated T cell is a primary T cell.

Assignees

• Harvard College

Inventors

• Meissner Torsten B
• Ferreira Leonardo M R
• Strominger Jack L
• Cowan Chad A

Classifications

• C12N5/0606 Primary

  Pluripotent embryonic cells, e.g. embryonic stem cells [ES] (embryonic germ cells C12N5/0611, induced pluripotent stem cells C12N5/0696) · CPC title

• C12N2501/50

  Cell markers; Cell surface determinants · CPC title

• A61K39/001 Primary

  Preparations to induce tolerance to non-self, e.g. prior to transplantation · CPC title

• C12N2501/998

  Proteins not provided for elsewhere · CPC title

• C12N2510/00

  Genetically modified cells · CPC title