Open AccessExpression of TrkC Receptors in the Developing Brain of the Monodelphis opossum and Its Effect on the Development of Cortical Cells
Author(s) -
Katarzyna Bartkowska,
Monika Gajerska,
K Turlejski,
R Djavadian
Publication year - 2013
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0074346
Subject(s) - tropomyosin receptor kinase c , biology , microbiology and biotechnology , opossum , receptor , neurotrophin 3 , neuroscience , brain derived neurotrophic factor , anatomy , growth factor , neurotrophic factors , genetics , platelet derived growth factor receptor
In this study, we investigated the distribution, localization and several various functions of TrkC receptors during development of theMonodelphisopossumbrain. Western blotting analysis showed that two different forms of the TrkC receptor, the full-length receptor and one of its truncated forms, are abundantly expressed in the opossum brain. The expression of TrkC receptors was barely detected in the brain of newborn opossums. At postnatal day (P) 3, the expression of full-length TrkC remained at low levels, while moderate expression of the TrkC truncated form was detected. The expression levels of both forms of this protein gradually increased throughout development, peaking at P35. We found that in different neocortical areas located both at the rostral and caudal regions of the cortex, up to 98% of BrdU-labeled cells forming cortical layers (II-VI) had prominently expressed TrkC. To assess which developmental processes of cortical cells are regulated by TrkC receptors, three different shRNAs were constructed. The shRNAs were individually tested in transfected cortical progenitor cells grown on culture plates for 2 days. The effects of the shRNA-TrkC constructs were similar: blockade of TrkC receptors decreased the number of Ki67-positive and apoptotic cells, and it did not change the number of TUJ-positive neurons in vitro . Thus, the lack of TrkC receptors in cultured progenitor cells provided insight on the potential role of these receptors in the regulation of proliferation and cell survival but not in the differentiation of cortical cells.