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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

TLR4 and CD14 receptors expressed in rat pineal gland trigger NFKB pathway

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Cruz-Machado, Sanseray da Silveira [1] ; Carvalho-Sousa, Claudia Emanuele [1] ; Tamura, Eduardo Koji [1] ; Pinato, Luciana [1, 2] ; Cecon, Erika [1] ; Magno Fernandes, Pedro Augusto Carlos [1] ; Werneck de Avellar, Maria Christina [3, 2] ; Ferreira, Zulma Silva [1] ; Markus, Regina Pekelmann [1]
Total Authors: 9
[1] Univ Sao Paulo, Lab Cronofarmacol, Inst Biociencias, BR-05508900 Sao Paulo - Brazil
[2] Univ Estadual Paulista, Dept Speech Language & Hearing Therapy, Marilia - Brazil
[3] Univ Fed Sao Paulo, Dept Pharmacol, Sect Expt Endocrinol, Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Pineal Research; v. 49, n. 2, p. 183-192, SEP 2010.
Web of Science Citations: 61

Nuclear factor-kappa B (NFKB), a pivotal player in inflammatory responses, is constitutively expressed in the pineal gland. Corticosterone inhibits pineal NFKB leading to an enhancement of melatonin production, while tumor necrosis factor (TNF) leads to inhibition of Aa-nat transcription and the production of N-acetylserotonin in cultured glands. The reduction in nocturnal melatonin surge favors the mounting of the inflammatory response. Despite these data, there is no clear evidence of the ability of the pineal gland to recognize molecules that signal infection. This study investigated whether the rat pineal gland expresses receptors for lipopolysaccharide (LPS), the endotoxin from the membranes of Gram-negative bacteria, and to establish the mechanism of action of LPS. Here, we show that pineal glands possess both CD14 and toll-like receptor 4 (TLR4), membrane proteins that bind LPS and trigger the NFKB pathway. LPS induced the nuclear translocation of p50/p50 and p50/RELA dimers and the synthesis of TNF. The maximal expression of TNF in cultured glands coincides with an increase in the expression of TNF receptor 1 (TNFR1) in isolated pinealocytes. In addition, LPS inhibited the synthesis of N-acetylserotonin and melatonin. Therefore, the pineal gland transduces Gram-negative endotoxin stimulation by producing TNF and inhibiting melatonin synthesis. Here, we provide evidence to reinforce the idea of an immune-pineal axis, showing that the pineal gland is a constitutive player in the innate immune response. (AU)

FAPESP's process: 07/07871-6 - Imune-pineal Axis: injury shifts melatonin production from endocrine to paracrine
Grantee:Regina Pekelmann Markus
Support type: Research Projects - Thematic Grants