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Methods of Inducing Immune Tolerance Using Immunotoxins

Posted Apr 04 2013 8:00pm

Description of Invention:
The invention concerns immunotoxins and methods of using the immunotoxins for the treatment of rejection response in a patient, including graft-versus-host disease and transplantation of organs, tissues and cells into a host. In a specific embodiment of the invention, the transplant involves pancreatic islet cells. The immunotoxins are targeted via an antibody that is specific to T cells. This allows the specific ablation of resting T cells, resulting in an accentuation of immune tolerizing responses and an increased tolerance to transplants and grafts. The toxin portion of the immunotoxin is genetically engineered to maintain bioactivity when recombinantly produced in Pichia pastoris. Data are available in transgenic animals expressing human CD3epsilon which supports the effects of the immunotoxin against T cells.

  • Use of immunotoxins decreases T cell population, allowing greater host immune tolerance of transplants and grafts.
  • Specific method for increasing immune tolerance to pancreatic islet transplants.

  • Specificity of the immunotoxin avoids the killing of other cells, reducing side-effects associated with other mechanisms of treatment (X-ray and cyclophosphamide) such as infection and induced malignancy.
  • A GMP production process for the immunotoxin has already been successfully implemented.

David M Neville Jr (NIMH)

Patent Status:
HHS, Reference No. E-012-1991/7
US, , Patent No. 6,103,235, Issued 15 Aug 2000
US, , Patent No. 7,125,553, Issued 24 Oct 2006
US, , Patent No. 7,288,254, Issued 30 Oct 2007
US, , Patent No. 6,632,928, Issued 14 Oct 2003
US, , Patent No. 7,696,338, Issued 13 Apr 2010
US, Application No. 12/718,673 filed 05 Mar 2010
US, Application No. 13/443,779 filed 10 Apr 2012

Foreign rights are also available.

For Licensing Information Please Contact:
Samuel Bish Ph.D.
NIH Office of Technology Transfer
6011 Executive Blvd. Suite 325,
Rockville, MD 20852
United States
Phone: 301-435-5282
Fax: 301-402-0220

Ref No: 1571

Updated: 04/2013

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