Abstract
The study describes the immunoreactivity of calbindin (CB), calretinin (CR) and parvalbumin (PV), their distribution pattern and the co-distribution of CB and CR as well as CB and PV in the septum of the guinea pig during development. Immunohistochemistry was conducted on embryonic (E40, E50, E60), newborn (P0) and postnatal (P5, P10, P20, P40, P100) guinea pig brains. The presence of both CB and CR was detected at E40, while PV began to be observed at E60. Immunoreactivity for CB was constant throughout ontogeny. In contrast to CR immunoreactivity, PV immunoreactivity was higher in the postnatal stages than in the prenatal and newborn stages. Double immunostaining showed that CB co-localized with CR from E40 onwards, while with PV from P5 onwards, suggesting that CB co-operates with these proteins in the guinea pig septum during different periods of ontogeny. Our results also indicate that among the studied CaBPs, CB exhibited the highest immunoreactivity during both embryonic and postnatal development.
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