Type 1 Diabetes Vaccine Candidate Launches USA Study

City of Hope PIpepTolDC vaccine candidate limits a person’s immune response
hopeful woman praising the sky
California (Precision Vaccinations News)

A Phase 1 clinical trial featuring an investigational vaccine that uses a person’s own immune cells, a beta cell protein, and vitamin D3 to potentially treat type 1 diabetes is now recruiting patients.

The City of Hope trial is part of The Wanek Family Project for Type 1 Diabetes, which seeks to find cures for the disease.

Known as the PIpepTolDC vaccine, the “inverse” vaccine, which was previously evaluated for safety and feasibility in a clinical trial in the Netherlands. An inverse vaccine aims to stop certain specific immune responses rather than activate them.

For the trial, the investigational vaccine will be developed using a patient's own dendritic cells, a type of immune cell. 

In a City of Hope laboratory, those cells will be cultured and loaded with vitamin D3 and a fragment of pro-insulin to help train the immune system to reduce inflammation. Patients will then receive their modified immune cells via two injections, one month apart.

“There is currently no approved immunotherapy for type 1 diabetes patients, and the City of Hope aims to change that,” stated Bart O. Roep, Ph.D., City of Hope’s Chan Soon-Shiong Shapiro Distinguished Chair in Diabetes and director of The Wanek Family Project. 

“Our trial aims to engage a person’s immune system, rather than suppress it, and to try to stop it from attacking the insulin-producing cells. The vaccine could also have the positive effect of preventing diabetic complications like blindness and neuropathy.”

“It is a very exciting time for type 1 diabetes as we move from just treating the symptoms to actually trying to stop the disease,” Roep added in a press statement issued on December 10, 2020.

The trial is open to adults with type 1 diabetes between the ages of 18 and 45 who were diagnosed with type 1 diabetes in the last one to four years when there are many more beta cells to be preserved and protected.

The trial — part of the Diabetes & Metabolism Research Institute at City of Hope —  is led by clinical principal investigator  Ryotaro Nakamura, M.D., a City of Hope professor in the Department of Hematology & Hematopoietic Cell Transplantation, who has many years of experience working with cellular therapies such as bone marrow and stem cell transplants.

“This is a very exciting and novel immunotherapy approach to potentially treat type 1 diabetes, and one that we hope can also lead to future applications in other autoimmune diseases and graft-versus-host disease,” Nakamura commented.

In the Netherlands study, nine participants were monitored for six months after receiving the investigational vaccine. No signs of systemic immune suppression or major adverse reactions were seen. 

Furthermore, beta-cell function and overall diabetic control remained stable, and all patients maintained healthy blood sugar levels after treatment.

These patients had been diagnosed with type 1 diabetes for as long as 10 years. Even though these patients no longer produced insulin or much less than patients with a more recent diagnosis, the vaccine still showed some positive effect. 

“In the future, this strategy could be tweaked to treat other autoimmune or inflammatory diseases such as arthritis, multiple sclerosis, or psoriasis, as long as you know the driving trigger,” Roep said.

For the trial, City of Hope will also use a new type of conduit to deliver a treatment called microneedles, which are grouped together and applied like a transdermal patch, injecting the immune cells under the skin of patients rather than straight into the blood or muscle. This novel approach was used in the Netherlands study.

“This way, the modulated immune cells directly migrate to the relevant tissue, which is a great safety asset,” Roep said.

City of Hope is an independent biomedical research and treatment center for cancer, diabetes and other life-threatening diseases. Founded in 1913, City of Hope is a leader in bone marrow transplantation and immunotherapy such as CAR T cell therapy.

PrecisionVaccinations publishes research-based vaccine development news.


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