Transient increase of TUNEL-positive cells on postnatal day 20 in the developing rat olfactory bulb

Neuroscience Research
Kyoko SaitoSeiji Matsuda

Abstract

In the developing central nervous system, apoptosis plays an important role in the normal organization of the neuronal circuit. The timing of neurogenesis, proliferation, and migration of the neurons in the developing olfactory bulb (OB) is well studied; however, the involvement of apoptosis in this process is not fully understood. In this study, we examined the changes in the distribution and the number of apoptotic cells in the rat OB during embryonic and postnatal periods, by using terminal deoxynucleotidyl transferase-mediated dUTP-digoxigenin nick end-labeling (TUNEL) staining. Although the number of TUNEL-positive cells was relatively small during the embryonic period, it gradually increased after birth, and peaked on postnatal day 20 with statistical significance, especially in the granule cell layer of the main OB. This transient increase of TUNEL-positive cells on postnatal day 20 may be involved in a critical event during maturation of the OB.

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Citations

Feb 23, 2011·Development, Growth & Differentiation·Woon Ryoung Kim, Woong Sun
Jan 9, 2013·The Journal of Comparative Neurology·Todd H AhernNancy G Forger
Jun 23, 2006·Developmental Biology·Eric S TuckerAnthony-Samuel LaMantia
Jul 14, 2005·Neuroreport·Manfred BieblJürgen Winkler

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