Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Lateral Habenula and the Rostromedial Tegmental Nucleus Innervate Neurochemically Distinct Subdivisions of the Dorsal Raphe Nucleus in the Rat

Texto completo
Autor(es):
Sego, Chemutai [1, 2] ; Goncalves, Luciano [1, 3] ; Lima, Leandro [1] ; Furigo, Isadora C. [1] ; Donato, Jr., Jose [1] ; Metzger, Martin [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Biomed Sci, Dept Physiol & Biophys, BR-05508900 Sao Paulo - Brazil
[2] Univ Sao Paulo, Inst Biomed Sci, Dept Anat, BR-05508900 Sao Paulo - Brazil
[3] Univ Fed Triangulo Mineiro, Dept Human Anat, BR-38025180 Uberaba - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF COMPARATIVE NEUROLOGY; v. 522, n. 7, p. 1454-1484, MAY 1 2014.
Citações Web of Science: 53
Resumo

The lateral habenula (LHb) is an epithalamic structure differentiated in a medial (LHbM) and a lateral division (LHbL). Together with the rostromedial tegmental nucleus (RMTg), the LHb has been implicated in the processing of aversive stimuli and inhibitory control of monoamine nuclei. The inhibitory LHb influence on midbrain dopamine neurons has been shown to be mainly mediated by the RMTg, a mostly GABAergic nucleus that receives a dominant input from the LHbL. Interestingly, the RMTg also projects to the dorsal raphe nucleus (DR), which also receives direct LHb projections. To compare the organization and transmitter phenotype of LHb projections to the DR, direct and indirect via the RMTg, we first placed injections of the anterograde tracer Phaseolus vulgaris leucoagglutinin into the LHb or the RMTg. We then confirmed our findings by retrograde tracing and investigated a possible GABAergic phenotype of DR-projecting RMTg neurons by combining retrograde tracing with in situ hybridization for GAD67. We found only moderate direct LHb projections to the DR, which mainly emerged from the LHbM and were predominantly directed to the serotonin-rich caudal DR. In contrast, RMTg projections to the DR were more robust, emerged from RMTg neurons enriched in GAD67 mRNA, and were focally directed to a distinctive DR subdivision immunohistochemically characterized as poor in serotonin and enriched in presumptive glutamatergic neurons. Thus, besides its well-acknowledged role as a GABAergic control center for the ventral tegmental area (VTA)-nigra complex, our findings indicate that the RMTg is also a major GABAergic relay between the LHb and the DR. J. Comp. Neurol. 522:1454-1484, 2014. (c) 2013 Wiley Periodicals, Inc. (AU)

Processo FAPESP: 11/03292-7 - Circuitaria e assinatura neuroquímica das projeções entre a habenula lateral, o núcleo rostromedial tegmental e o núcleo dorsal da rafe
Beneficiário:Chemutai Sego
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 10/18086-0 - Bases moleculares da resistência à leptina
Beneficiário:Jose Donato Junior
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 12/02388-3 - Topografia e assinatura neuroquímica das projeções entre a habenula lateral, o núcleo rostromedial tegmental e o núcleo dorsal da rafe no rato
Beneficiário:Martin Andreas Metzger
Linha de fomento: Auxílio à Pesquisa - Regular