Saturday, November 29, 2014

Is There a Potential Cure for HIV?

It all started with the “Berlin Patient” in 2007. Timothy Brown was cured of HIV when given the stem cells of another patient who was naturally immune to the disease. When this happened two companies, Sangoma and Calimmune, took the opportunity to attempt to recreate the natural immunity to HIV in a lab. This natural immunity occurs because of a gene mutation on the CCR5 gene which is located on CD4 T-cells. When this gene is disable HIV cannot attack the T-cells.



Sangamo was the first to attempt the recreation in 2009. Lead by Carl June from the University of Pennsylvania, a team of researchers and doctors removed CD4 T-cells from patients with HIV. The study then focused on disabling the CCR5 gene alleles and then returning the modified cells to the patient. It was stated that this did no harm to the patients and the altered genes had a half-life of 48 day, which is expected because “…T-cells are not permanent residents of the body”. In fact, several of the patients in this study even exhibited a decline in their HIV levels.

The next company to attempt to recreate the natural immunity to HIV is Calimmune. In 2013 a team led by David Baltimore and Irvin Chen decided to take a different approach to solve the task at hand. Instead of focusing their work on T-cells, they decided to take advantage of blood stem cells. This approach is different because blood stem cells, unlike T-cells, are permanent residents in the body. During this study patients were “given back both their own T cells, and longer-lived HSCs [blood stem cells], both with the CCR5 gene disabled using hairpin RNAs delivered by a lentivirus.” By doing this they hope that these blood stem cells can continue to produce T-cells with disabled CCR5 gene alleles throughout a patient’s lifetime.

Despite the fact that neither of these studies have conclusive clinical trials yet, Harvard University has decided to be next in the search for a cure for HIV. Their approach will include new CRISPR/Cas technology which has already proven effective in mice. It was stated that Harvard may even apply for clinical trial approval in five years.




9 comments:

  1. Considering the large number of individuals who suffer from HIV and the lack of availability of a cure for the condition, the indication of the possible development of a true cure is certainly fascinating. Finding individuals who are immune to the disease sounds like a great start, as researchers can try to induce that same immunity in individuals who are not naturally immune. It really is amazing that gene mutations for immunity such as that to the CCR5 gene can be discovered. Hopefully the research at Harvard University will prove fruitful in taking advantage of gene mutations allowing for immunity in producing more effective treatments or even a cure. Very interesting topic!

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  2. That is absolutely incredible! If they can find ways to pass on immunities, they could save lives of numerous people. They could save, not only people of HIV, but other diseases as well. This will be a huge leap forward in the field of medicine.

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