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Prostaglandin E2 levels in
human brain tumor tissues and arachidonic acid levels in the plasma membrane of
human brain tumors
Kokoglu E, Tuter Y, Sandikci KS, Yazici Z, Ulakoglu EZ,
Sonmez H, Ozyurt E
Department of Biochemistry, Cerrahpasa
Medical Faculty, University of Istanbul, Turkey
Arachidonic acid is stored in the cell membrane and released
when the cell is activated by appropriate stimuli.
It is the substrate for prostaglandins.
Both experimental and human tumors often synthesize high levels of
prostaglandins, most notably prostaglandin E2 (PGE2).
Some experiments suggest that these compounds increase tumor growth through
their actions on host immunocytes.
In this study, 22 patients with various brain tumors and 12 control brain
tissues were studied.
PGE2 levels in tissue samples were measured by ELISA.
Arachidonic acid levels in the plasma membrane of tissue samples were analyzed
by capillary gas chromatography.
The levels of PGE2 were significantly higher in gliomas (n = 10) and meningiomas
(n = 7) compared with control tissues (P = 0.000 and P = 0.000, respectively).
Also, PGE2 levels in meningiomas were significantly higher than in gliomas (P =
0.000).
Arachidonic acid levels in the plasma membrane of gliomas (n = 9) and
meningiomas (n = 6) were significantly higher than in the control tissues (P =
0.000 and P = 0.000, respectively).
These results suggest that the increased production of PGE2 may suppress the
immune system and play an important role in tumor growth.
PMID: 10397448 [PubMed - indexed for MEDLINE]
Source: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10397448&dopt=Abstract
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