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Veterinary college researcher studying brain tumors in people and animals
Date:3/31/2008

ontrol thought, sensations and motion. Glial cells outnumber neurons by a factor of about ten to one in the brain, and they play an essential role in creating the architecture and structure of the brain and supporting its functions.

There are several different specific types of glial cells, but two that interest Rossmeisl and colleagues most are called astrocytes and oligodendrocytes. Oncogenic abnormalities associated with each of these can lead to cancers called astrocytomas and oligodendrocytomas, according to Rossmeisl.

The most common approaches for managing these tumors involve surgical excision, radiation therapy and chemotherapy. But conventional radiation and chemotherapy affect normal cells in addition to the cancerous cells they target, so perfecting approaches that exclusively target the molecular abnormalities present in each individuals cancer cells and spare healthy cells is a major thrust in modern oncology.

To develop more precisely targeted systems for administering therapeutic agents to cancer cells, Rossmeisl and his colleagues are attempting to further establish the molecular similarity of human and canine gliomas.

Scientists know that when astrocytomas spontaneously arise in people, they over-express three proteins: interleukin 13 receptor alpha2 (IL-13R), which is a cancer testis tumor like agent; EphA2, a tyrosine kinase receptor; and fos-related antigen 1, an AP-1 transcription factor.

Rossmeisl and colleagues working in the colleges Center for Comparative Oncology have opened a clinical trial and are currently enrolling animals from around the region that have been positively diagnosed with a brain mass consistent with the appearance of a glioma on magnetic resonance imaging (MRI).

The researchers will be studying tissue samples from affected animals in search of these proteins that are not otherwise present in normal brain tissues. Identifying these proteins could further document th
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Contact: Jeff Douglas
jdouglas@vt.edu
540-231-7911
Virginia Tech
Source:Eurekalert

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