[EXPRESSION OF SEROTONIN TRANSPORTER IN THE DORSAL RAPHE NUCLEUS DURING THE EARLY POSTNATAL PERIOD IN NORMAL STATE AND UNDER PRENATAL DEFICIENCY OF THE SEROTONERGIC SYSTEM IN RATS].

The expression of the serotonin transport membrane protein (5-NTT) in the dorsal raphe nucleus (DNR) was investigated in laboratory Wistar rats during the early postnatal period. The results of the immunocytochemical study using primary antibodies--anti-Serotonin transporter antibody (AbCam, UK)--showed that during the first 3 postnatal weeks the intensity of 5-NTT expression in DNR of control animals changes. At the earliest postnatal times the main part of subnuclear neurons (dorsal, ventral and lateral ones) of the dorsal raphe nucleus (DNR-d, DNR-v, DNR-lat) was shown to intensely express 5-NTT. Sites of 5-NTT localization are found on the membrane surface of neuron bodies and processes in neuropile. The reduction in the number of neurons expressing 5-NTT and of its binding sites was observed on P10. At this time a redistribution of 5-NTT localization sites occurs: they are very few on neuron bodies and dendrites but are located rather densely on the plasma membrane of axons. The number of neurons expressing 5-NTT gradually increases with age and in neuropile the density of 5-NTT localization sites rises. It is shown that during the prenatal development the reduction of serotonin level in all parts of the DNR leads to a reduction in both the number of neurons expressing 5-NTT and sites of its localization in the early postnatal period, this trend continuing with age.