首页> 美国卫生研究院文献>Springer Open Choice >Mesopontine rostromedial tegmental nucleus neurons projecting to the dorsal raphe and pedunculopontine tegmental nucleus: psychostimulant-elicited Fos expression and collateralization
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Mesopontine rostromedial tegmental nucleus neurons projecting to the dorsal raphe and pedunculopontine tegmental nucleus: psychostimulant-elicited Fos expression and collateralization

机译:投射到背缝和足桥骨被指核的中脑桥间质被膜被指核神经元:精神刺激诱发的Fos表达和侧支化

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摘要

The mesopontine rostromedial tegmental nucleus (RMTg) is a GABAergic structure in the ventral midbrain and rostral pons that, when activated, inhibits dopaminergic neurons in the ventral tegmental area and substantia nigra compacta. Additional strong outputs from the RMTg to the pedunculopontine tegmental nucleus pars dissipata, dorsal raphe nucleus, and the pontomedullary gigantocellular reticular formation were identified by anterograde tracing. RMTg neurons projecting to the ventral tegmental area express the immediate early gene Fos upon psychostimulant administration. The present study was undertaken to determine if neurons in the RMTg that project to the additional structures listed above also express Fos upon psychostimulant administration and, if so, whether single neurons in the RMTg project to more than one of these structures. We found that about 50% of RMTg neurons exhibiting retrograde labeling after injections of retrograde tracer in the dorsal raphe or pars dissipata of the pedunculopontine tegmental nucleus express Fos after acute methamphetamine exposure. Also, we observed that a significant number of RMTg neurons project both to the ventral tegmental area and one of these structures. In contrast, methamphetamine-elicited Fos expression was not observed in RMTg neurons labeled with retrograde tracer following injections into the pontomedullary reticular formation. The findings suggest that the RMTg is an integrative modulator of multiple rostrally projecting structures.
机译:中桥脑基底膜前列被盖核(RMTg)是腹中脑和延髓桥的GABA能结构,激活后可抑制腹盖区和黑质致密部的多巴胺能神经元。通过顺行示踪确定了从RMTg到pedunculopontine盖状被膜核,背ra核和桥状巨细胞网状结构的其他强大输出。投射到腹侧被盖区域的RMTg神经元在施用精神刺激药后会立即表达早期基因Fos。进行本研究是为了确定投射到上述其他结构的RMTg中的神经元在精神刺激剂给药后是否也表达Fos,如果是,则确定RMTg中的单个神经元是否投射至这些结构中的一个以上。我们发现,在急性甲基苯丙胺暴露后,在向背脊膜或人足桥被盖核的无核皮中注入逆行示踪剂后,约50%的RMTg神经元表现出逆行标记。此外,我们观察到大量RMTg神经元既投射到腹侧被盖区域又是这些结构之一。相比之下,在注射入髓质网状结构后,在用逆行示踪剂标记的RMTg神经元中未观察到甲基苯丙胺引起的Fos表达。这些发现表明,RMTg是多个沿结构突出的结构的整合调节剂。

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