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HHV-6 DR7 found to promote glioma development and progression

A Chinese group found HHV-6 direct repeat 7 in 48% of glioma tumors. Furthermore, they determined that DR7 overexpression could promote glioma cell migration, invasion and angiogenesis. Expression profiles showed that DR7 created an inflammatory microenvironment that enhanced degradation of the extracellular matrix.

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Foscarnet approved for HHV-6 encephalitis in Japan

Although foscarnet is widely used for HHV-6 encephalitis, it has never been specifically approved for HHV-6. Japan’s Ministry of Health, Labor and Welfare was the first to approve foscarnet (Foscavir) for the treatment of HHV-6 encephalitis.

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HHV-6 increases risk of an “idiopathic” pneumonia syndrome after HCT as does murine roseolovirus in a BMT mouse model. Early HHV-6 was also found to increase non-relapse mortality

Investigators from University of Michigan have demonstrated that murine roseolovirus is a useful homolog for the study of HHV-6 reactivation in lung disease. In a large retrospective study of HCT patients, they also found early HHV-6 reactivation to increase the risk of both idiopathic pneumonia syndrome and non-relapse mortality.

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HHV-6 is a greater risk than CMV for rejection in pediatric kidney transplantation

Investigators from the Children’s Hospital of Mexico found that although CMV caused the biggest increase in risk for liver rejection, HHV-6 was the more important infection associated with rejection of kidney transplants. A single HHV-6 infection resulted in an increased risk of over 5 fold, while a coinfection of EBV, HHV-6 and HHV-7 increased the risk of kidney rejection by over 17 fold.

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HHV-6 in Cancer: Does it play a role?

Since its discovery, HHV-6 has been studied in the context of lymphoproliferative disorders and various types of cancer. Several obstacles, particularly the ubiquitous nature of the virus, have made it difficult to determine exactly how HHV-6 might, or might not, be involved in tumor development.