Stem cell Transplantation in the context of a cancer treatment, although the HI-virus will disappear, but German researchers sound a note of caution: As in HIV therapy, stem cell Transplantation is not suitable.
No one wants to speak of “healing”, but nevertheless, the message was that for the second Time in a HIV-Patient after a stem cell transplant is virus-free, worldwide headlines.
Scientists had reported on Tuesday that a formerly HIV-positive patients 18 months after a special stem cell transplantation no viruses were detected. The lymph glands, cancer, Hodgin’s lymphoma, diseased man stem cells had been a bone marrow donor to be transplanted, which is due to a rare genetic mutation resistant to HIV infection. After this stem cell treatment of the “London Patient will show” no symptoms of HIV infection.
Genetic peculiarity of the stem cell donor
Crucial to the stem cell donor, in which the HI Virus can no immune cell to infect, because a gene mutation of the most of the HI-virus used Receptor on the surface of immune cells, the CCR5 Receptor, was defective and therefore is not functional. The HI-Virus uses this Receptor as a type of portal of Entry for infection of immune cells. Without the functioning of the Co-Receptor, this path remains denied.
A similar case had taken place 12 years ago. The “Berlin Patient” Timothy Ray Brown has applied since 2008 as the first and, to date, only one HIV infection for the healed man. The London Doctors treated the patients described according to the same principle as in the time of the Berlin colleagues at the Charité.
That there is now a second case has been included in the specialist world: “repeatability is a crucial criterion of the scientific evidence,” said the Director of the Department of Virology at the University hospital of Heidelberg, Hans-Georg Kräusslich. The second case show according to the President of the German society for infectiology (DGI), Gerd Fätkenheuer, that the cure of the Berlin patient was not a singular event, but, in principle, repeatable. It’ll give scientists a boost searched for for a cure of HIV-Infected and the number of treatment could also narrow down strategies.
German scientists sound a note of caution
“This is an encouraging sign, but not proof of cure”, as the Heidelberg virologist Hans-Georg Kräusslich. So a Baby in the United States have had a total of 27 months after treatment, no detectable amount of virus, then the Virus had occurred.
Gero guardian, had treated in 2008, the “Berlin patient”, Brown at the Charité hospital in Berlin, pointed out that some patients who had received the same treatment, had died of complications or relapse of their cancer.
The anti-retro viral therapy (ART) with drugs remains the only HIV treatment option
Also, in the future, the Transplantation of stem cells will be no Option for the cure of a HIV-infection. In the case of a stem cell therapy, it was a massive intervention that “would not be in the face of a generally well-tolerated and effective long-term antiviral therapy is acceptable, if he were not contraindicated for other medical reasons,” says Kräusslich. So patients had received in both cases, these stem cells therapy due to their cancer and not because of their HIV disease.
Worldwide, millions of HIV patients will be treated once more with an anti-retro viral therapy (ART), which frees you from the Aids Virus. The life-long intake of drugs that keep the Virus in check, is currently the only way to treat HIV.
Lengthy and tricky search for new HIV therapy
What are the methods for the treatment of HIV are successful in the end, it is still largely unclear. The focus of the science of non-functional CCR5 Receptor on the surface of immune cells. To the development of HIV therapies, the genetic material of cells in HIV could be changed-the patient to the variant, the resistance trigger. Is trying to destroy the Gene for the CCR5 Receptor, for example, with the Genschere CRISPR/Casc9 in the own stem cells of patients, so infectable immune cells from the stem cells of the Person to produce.
The focus of the non-functional CCR5 Receptor on the surface of immune cells
This ethically controversial – approach of the Chinese researchers He Jiankui followed by changes in the genetic material of embryos using Genome editing. He was with this Experiment, at the end of last year for a storm of indignation, and the Chinese leadership has tightened the rules for the whole of the genetic research in China dramatically.
Worldwide, nearly 37 million people are infected with the HIV Virus, but only 59 percent of them received antiretroviral therapy. Every year, about one Million HIV patients die of diseases which are associated with the Virus. And now, a new, against drug-resistant HIV is of concern to the experts more and more.