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The utility of Ki-67 and BrdU as proliferative markers of adult neurogenesis.
- Source :
-
Journal of neuroscience methods [J Neurosci Methods] 2002 Mar 30; Vol. 115 (1), pp. 97-105. - Publication Year :
- 2002
-
Abstract
- Adult animals continue to produce new neurons in the dentate gyrus of hippocampus. Until now, the principal method of studying neurogenesis has been to inject either tritiated thymidine or 5'-Bromo-2-deoxyuridine (BrdU) intraperitoneally followed by autoradiographic or immunohistochemical detection methods respectively. However, such exogenous markers may produce toxic effects. Our objective was to determine whether Ki-67, a nuclear protein expressed in all phases of the cell cycle except the resting phase, can be used as an alternative, endogenous marker. Using immunohistochemistry, we examined Ki-67 and BrdU expression pattern in rats. Ki-67 was expressed within the proliferative zone of the dentate gyrus and its expression pattern mimicked that of BrdU when examined soon after exogenous BrdU administration. Quantitative comparison of BrdU and Ki-67-positive cells showed 50% higher numbers of the latter when examined 24 h after the BrdU injection. This was expected, since BrdU can be incorporated into DNA only during the S-phase of the mitotic process, whereas Ki-67 is expressed for its whole duration. Experimental increases (by ischemia) or reductions (by radiation) in the number of mitotic cells produced parallel changes in BrdU and Ki-67 signals. Thus, Ki-67 is an effective mitotic marker and has most of the benefits of BrdU and none of the costs. This study provides evidence for Ki-67 to be used as a marker of proliferation in the initial phase of adult neurogenesis.
- Subjects :
- Animals
Biomarkers analysis
Brain Ischemia metabolism
Brain Ischemia pathology
Brain Ischemia physiopathology
Cell Count
Dentate Gyrus cytology
Dentate Gyrus metabolism
Gamma Rays adverse effects
Immunohistochemistry methods
Injections, Intraperitoneal
Male
Nerve Tissue Proteins metabolism
Neurons cytology
Rats
Rats, Wistar
Stem Cells cytology
Bromodeoxyuridine pharmacology
Cell Differentiation physiology
Cell Division physiology
Dentate Gyrus growth & development
Ki-67 Antigen
Neurons metabolism
Stem Cells metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0165-0270
- Volume :
- 115
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Journal of neuroscience methods
- Publication Type :
- Academic Journal
- Accession number :
- 11897369
- Full Text :
- https://doi.org/10.1016/s0165-0270(02)00007-9