Abstract:
:Glutamate is the major excitatory neurotransmitter of the nervous system. We previously found that glutamate activates normal human T-cells, inducing their adhesion and chemotaxis, via its glutamate receptors of the alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) subtype 3 (GluR3) expressed in these cells. Here, we discovered that human T-leukemia (Jurkat) and cutaneous sezary T-lymphoma (HuT-78) cells also express high levels of GluR3. Furthermore, glutamate (10 nM) elevates CD147/EMMPRIN, a cancer-associated matrix metalloproteinases (MMPs) inducer, promoting spread of many tumors. Glutamate-induced CD147 elevation in both cancerous and normal human T-cells was mimicked by AMPA (glutamate/AMPA-receptor agonist) and blocked by CNQX (glutamate/AMPA-receptor antagonist). Importantly, glutamate also increased gelatinase MMP-9 secretion by T-lymphoma. Finally, ex vivo pre-treatment of T-leukemia with glutamate enhanced their subsequent in vivo engraftment into chick embryo liver and chorioallantoic membrane. Together, these findings reveal that glutamate elevates cancer associated proteins and activity in T-cell cancers and by doing so may facilitate their growth and spread, especially to and within the nervous system. If so, glutamate receptors in T-cell malignancies should be blocked.
journal_name
Leuk Lymphomajournal_title
Leukemia & lymphomaauthors
Ganor Y,Grinberg I,Reis A,Cooper I,Goldstein RS,Levite Mdoi
10.1080/10428190902878448subject
Has Abstractpub_date
2009-06-01 00:00:00pages
985-97issue
6eissn
1042-8194issn
1029-2403pii
910663790journal_volume
50pub_type
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