Attractin is elevated in the cerebrospinal fluid of patients with malignant astrocytoma and mediates glioma cell migration.
OBJECTIVE
There are a limited number of noninvasive methods available for the monitoring of neoplastic disease in the central nervous system. The goal of our study was to find reliable markers that could be used for disease monitoring as well as to identify new targets for the therapeutic intervention for malignant astrocytoma (WHO grades 3 and 4).


METHODS
We employed proteomic techniques to identify secreted proteins in the cerebrospinal fluid that were specific to patients with malignant astrocytoma.


RESULTS
Among 60 cerebrospinal fluid samples of patients with various central nervous system diseases, attractin was consistently found to be elevated in the samples of patients with malignant astrocytoma. To independently validate these results, we examined attractin expression in a new set of 108 normal and tumoral brain tissue specimens and found elevated expression in 97% of malignant astrocytomas, with the highest levels in grade 4 tumors. Using immunohistochemistry, we further showed that attractin is produced and secreted by the tumor cells. Finally, we showed that cerebrospinal fluid from brain tumor patients induces glioma cell migration and that attractin is largely responsible for this promigratory activity.


CONCLUSIONS
Our results find attractin to be a reliable secreted marker for high-grade gliomas. Additionally, our migration studies suggest that it may be an important mediator of tumor invasiveness, and thus, a potential target in future therapies.
Khwaja
Fatima W
FW
Laboratory of Molecular Neuro-Oncology, Department of Neurosurgery, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
Duke-Cohan
Jonathan S
JS
Brat
Daniel J
DJ
Van Meir
Erwin G
EG
D001254:Astrocytoma / Q000134:cerebrospinal fluid* / Q000378:metabolism; D015153:Blotting, Western; D001932:Brain Neoplasms / Q000134:cerebrospinal fluid* / Q000378:metabolism; D002465:Cell Movement / Q000502:physiology*; D015180:Electrophoresis, Gel, Two-Dimensional; D005910:Glioma / Q000134:cerebrospinal fluid* / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D008565:Membrane Proteins / Q000134:cerebrospinal fluid* / Q000235:genetics / Q000378:metabolism; D009361:Neoplasm Invasiveness
C492192:ATRN protein, human; D008565:Membrane Proteins