2007 Fiscal Year Final Research Report Summary
Mechanism for sex difference in pain responses (1) Mapping of and time course of the exression of phosphorylated CREB induced by formalin
| Project/Area Number |
17590208
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental physiology (including Physical medicine and Nutritional physiology)
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| Research Institution | Yokohama City University |
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Principal Investigator |
TANAKA Fukuko (貴邑 冨久子) Yokohama City University, Graduate School of Medicine Department of Physiology, Visiting Professor (40046066)
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| Co-Investigator(Kenkyū-buntansha) |
FUNABASHI Toshiya Yokohama City University, Graduate School of Medicine Department of Physiology, Associate Professor (70229102)
MITSUSHIMA Dai Yokohama City University, Graduate School of Medicine Department of Physiology, Associate Professor (70264603)
TAKASE Kenkichi Yokohama City University, Graduate School of Medicine Department of Physiology, Assistant Professor (80381474)
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| Project Period (FY) |
2005 – 2006
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| Keywords | sex difference / CREB / Formalin test / nociceptive stimuli / sexual differentiatin / bed nucleus of the stria terminalis / DARPP32 / rat |
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| Research Abstract |
Formalin injection induces two phases of nociceptive responses separated by interphase, a brief quiescent period. This pattern was similar in both sexes, but there was a prominent increase in nociceptive response during interphase in female rats. Next, the expression of phosphorylated CREB (pCREB) was immunohistochemically examined during various times after formalin injection. We found that the number of pCREB-immunoreactive cells (pCREB cells) in the bilateral dorsolateral divisions of the bed nucleus of the stria terminalis (BSTLD) was significantly increased by formalin injection in females, but not in males. These changes were observed selectively 5-10 min after formalin injection, a period corresponding to behavioral interphase, and were specific to formalin injection. These data indicate that the CREB in the BSTLD is phosphorylated in a female-specific manner in association with the sex difference in the formalin test. We next examined the effects of castration and testosterone or 17β-estradiol replacement Behavioral data indicated the involvement of estrogen in interphase. In parallel with the behavioral data, there were no changes in the number of pCREB cells in the BSTLD of orchidectomized rats 5-10 min (interphase) after formalin injection irrespective of steroid replacement. In ovariectomized rats, however, the number of pCREB cells in the testosterone or estrogen replaced groups injected with formalin was significantly greater than in the saline injected rats. Furthermore, formalin injection failed to increase the pCREB expression in ovariectomized rats without steroid replacement. These results indicate that the changes in both behavioral and pCREB responses observed during interphase are gonadal steroid-dependent in female rats.
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Research Products
(11 results)
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[Journal Article] Gonadal steroid, hormones maintain the stress-induced acetylcholine release in the hippocampus: simultaneous measurements of the extracellular acethylcholine and serum corticosterone levels in the same subjects2008
Author(s)
Mitsushima, D, Yamada, K, Takase, K, Funabashi, T, Kimura, F
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Journal Title
Endocrinology 149
Pages: 802-811
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Sex differences in the basolateral amygdala: the extracellular levels of serotonin and dopamine, and their responses to restraint stress in rats2006
Author(s)
Mitsushima, D, Yamada, K, Takase, K, Funabashi, T, Kimura, F
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Journal Title
Eur J Neurosci 24
Pages: 3245-3254
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] 「研究成果報告書概要(欧文)」より2006
Author(s)
Furuta, M, Funabashi, T, Kawaguchi, M, Nakamura, TJ, Mitsushima, D, Kimura, F
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Journal Title
Neuroendocrinology 84
Pages: 14-20
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