A new scientific breakthrough has raised hope for completely curing type 1 diabetes after researchers successfully prevented and reversed the disease in mice. In the study, scientists treated mice by transplanting donor blood-forming stem cells together with insulin-producing islet cells. The approach created a mixed, or chimeric, immune system, meaning the immune system became partly donor and partly recipient.

A new scientific breakthrough has raised hope for completely curing type 1 diabetes after researchers successfully prevented and reversed the disease in mice.

In the study, scientists treated mice by transplanting donor blood-forming stem cells together with insulin-producing islet cells. The approach created a mixed, or chimeric, immune system, meaning the immune system became partly donor and partly recipient.

This helped the mice tolerate the new islet cells and stopped further autoimmune attacks on the pancreas.

Type 1 diabetes occurs when the immune system mistakenly destroys the body’s own insulin-producing beta cells in the pancreatic islets. The new method works by essentially resetting this faulty immune response.

Before the transplant, mice received low-dose radiation and targeted antibodies. This mildly suppressed their immune system without completely wiping it out.

They were then given donor hematopoietic stem cells to rebuild a more tolerant immune system and healthy donor pancreatic islets to restore insulin production. Researchers also used a short course of an existing immunosuppressive drug to support the process.

The results were striking. The transplanted cells were not rejected, the mice did not develop graft-versus-host disease, and diabetes was completely prevented or reversed.

In one group, all 19 treated mice remained diabetes-free. In another group, all 9 mice that already had diabetes were fully cured.

A key reason this breakthrough is raising hope is that nearly every part of the treatment protocol is already approved and routinely used in human medicine. This includes the antibodies, low-dose radiation and immunosuppressive drugs used in the study.

This could shorten the path toward clinical trials in people.

However, challenges remain as researchers still need to address the limited supply of human islet cells and the need for donor-recipient matching.

Scientists are also working on lab-grown islets and methods to produce larger amounts of compatible tissue.

If proven safe and effective in humans, this strategy could offer a potential cure for type 1 diabetes. It could also help transform treatment for other autoimmune conditions, including lupus and rheumatoid arthritis, and improve outcomes in organ transplantation.

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