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  • Title: Serotonin-containing projections to the thalamus in the rat revealed by a horseradish peroxidase and peroxidase antiperoxidase double-staining technique.
    Author: Consolazione A, Priestley JV, Cuello AC.
    Journal: Brain Res; 1984 Nov 26; 322(2):233-43. PubMed ID: 6210128.
    Abstract:
    The retrograde transport of horseradish peroxidase (HRP) has been used in combination with peroxidase antiperoxidase (PAP) immunocytochemistry in order to investigate serotonin-containing projections to the thalamus of the rat. Sections were histochemically stained to reveal retrogradely transported HRP and then PAP immunostained using a monoclonal anti-serotonin (5-HT) antibody. Following HRP injections into the ventral thalamus, retrogradely labelled cells were observed in a number of sites in the brainstem and including areas known to be rich in 5-HT-containing neurons. At rostral levels of the dorsal raphe nucleus, retrogradely labelled cells were observed both on the midline and in a distinct lateral group extending diffusely into the periaqueductal gray (PAG). In both of these areas many 5-HT-immunoreactive HRP retrogradely labelled neurons were observed. However, except for the most rostral levels of the dorsal raphe nucleus, such double-labelled cells represented only a small proportion of the total population of 5-HT-immunoreactive neurons. In the lateral group, the retrograde labelling was mainly unilateral to the injection site but some contralateral labelling was also seen. At caudal levels of the dorsal raphe nucleus, retrogradely labelled cells were observed predominantly in the lateral group. At the level of the dorsolateral tegmental nucleus, few 5-HT or 5-HT/HRP labelled cells were observed in the lateral group, although HRP retrogradely labelled neurons were present. Double-stained cells were detected also in the medial raphe nucleus (corresponding to the B8 cell group according to the nomenclature of Dahlström and Fuxe), among the fibres of the medial lemniscus (B9), and in nucleus raphe pontis (B5).
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