Double labeling with non-isotopic in situ hybridization and BrdU immunohistochemistry: calmodulin (CaM) mRNA expression in post-mitotic neurons of the olfactory systemS Biffo, L Verdun di Cantogno and A Fasolo Dipartimento Biologia Animale, Torino, Italy. We describe a novel histochemical procedure for simultaneous detection of mRNA expression by in situ hybridization (ISH) and DNA synthesis on cells that are pulse-labeled with bromodeoxyuridine (BrdU) by immunohistochemistry (ICC). Pregnant rats were injected with BrdU at embryonic Day 20 and the olfactory bulbs of their pups were collected daily. The expression of calmodulin (CaM) mRNA was analyzed by ISH with an anti-sense digoxigenin-labeled riboprobe and BrdU incorporation by indirect ICC. Starting 5 days after BrdU injection, a few tufted and granular neurons of the olfactory bulb were observed to be double labeled for CaM mRNA and BrdU. To study the olfactory neuroepithelium, adult animals were injected with BrdU, sacrificed after 30 days, and the nasal mucosa dissected and decalcified. The co-expression of CaM mRNA and BrdU incorporation was then analyzed in the olfactory neuroepithelium: BrdU-positive primary olfactory neurons were also CaM mRNA positive. The combination of ISH and ICC on the same section resulted in improved BrdU staining with respect to both increased intensity and reduced background levels. The procedure described here can be applied to a variety of problems in developmental biology and is of potential value for correlating the timing of specific mRNA expression with the birth date of a cell type of interest.
Volume 40,
Issue 4,
pp. 535-540,
04/01/1992
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S. T. Magness, A. Tugores, E. S. Diala, and D. A. Brenner Analysis of the Human Ferrochelatase Promoter in Transgenic Mice Blood, July 1, 1998; 92(1): 320 - 328. [Abstract] [Full Text] [PDF] |
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T Roztocil, L Matter-Sadzinski, C Alliod, M Ballivet, and J. Matter NeuroM, a neural helix-loop-helix transcription factor, defines a new transition stage in neurogenesis Development, January 9, 1997; 124(17): 3263 - 3272. [Abstract] [PDF] |
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S. Dunwoodie, D Henrique, S. Harrison, and R. Beddington Mouse Dll3: a novel divergent Delta gene which may complement the function of other Delta homologues during early pattern formation in the mouse embryo Development, January 8, 1997; 124(16): 3065 - 3076. [Abstract] [PDF] |
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