Cyclin D1 and cyclin E are co-localized with cyclo-oxygenase 2 (COX-2) in pyramidal neurons in Alzheimer disease temporal cortex.
Regular use of non-steroidal anti-inflammatory drugs (NSAIDs) seems to reduce the progression of several diseases, including colon cancer, lung cancer, breast cancer and Alzheimer disease (AD). Several studies have shown that NSAIDs can modulate cell cycle progression, especially in the G0/G1 phase. The main target of most NSAIDs is the enzyme cyclo-oxygenase (COX), which occurs in 2 isoforms, COX-1 and COX-2. In AD and non-demented control brain, COX-2 is expressed in neuronal cells. In this study the expression of COX-2, cyclin D1, and cyclin E was investigated at the immunohistochemical level in AD and non-demented control temporal cortex. COX-2, cyclin D1, and cyclin E expression was detected in pyramidal neurons in both AD and control patients. The number of COX-2-immunoreactive neurons positively correlated with the number of cyclin E- and cyclin D1-immunoreactive neurons. Moreover, immunostaining of sequential tissue sections and double immunofluorescence labeling revealed co-expression of COX-2 and cyclin D1 and E in neuronal cells. In addition, an inverse correlation was observed between the neuronal expression of COX-2 and cyclin E and the Braak score for amyloid beta deposits. Our findings suggest a relationship between the neuronal expression of COX-2 and cell cycle markers, which may be involved early in AD pathology.
Hoozemans
Jeroen J M
JJ
Graduate School Neurosciences Amsterdam, Research Institute Neurosciences, Vrije Universiteit, Department of Pathology, VU University Medical Center, The Netherlands.
Brückner
Martina K
MK
Rozemuller
Annemieke J M
AJ
Veerhuis
Robert
R
Eikelenboom
Piet
P
Arendt
Thomas
T
D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000378:metabolism*; D019938:Cyclin D1 / Q000378:metabolism*; D019927:Cyclin E / Q000378:metabolism*; D051546:Cyclooxygenase 2; D005260:Female; D006801:Humans; D007527:Isoenzymes / Q000378:metabolism*; D008297:Male; D008565:Membrane Proteins; D008875:Middle Aged; D009474:Neurons / Q000378:metabolism; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism*; D017966:Pyramidal Cells / Q000378:metabolism*; D012016:Reference Values; D013702:Temporal Lobe / Q000378:metabolism*; D014018:Tissue Distribution
D019927:Cyclin E; D007527:Isoenzymes; D008565:Membrane Proteins; D019938:Cyclin D1; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases