A BOLD-fMRI study of cerebral activation induced by injection of algesic chemical substances into the anesthetized rat forepaw
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概要
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This study was performed to examine whether the brain activities induced by noxious algesic chemical substances in anesthetized animals could be detected by blood oxygen-leveldependent functional magnetic resonance imaging (BOLD-fMRI). Multislice gradient echo images of the primary somatosensory cortex were obtained using a 7.05 T superconducting system and a one-turned surface coil centered over the primary somatosensory cortex of the 1.0%- isoflurane-anesthetized rat. The Z-score t-map of BOLD signals and its time-course analysis revealed that subcutaneous injection of formalin into the left forepaw immediately induced an early response in the contralateral primary sensory cortex lasting for a few minutes, followed by a late response until 20 min after stimulation. In contrast, injection of capsaicin into the left forepaw evoked only the early response. Furthermore, pretreatment with morphine completely abolished these responses induced by the chemical algesic substances. Thus BOLD-fMRI is a useful method to analyze the brain activities of painful stimulation in anesthetized animals.
著者
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浅沼 武敏
北海道大学大学院獣医学研究科環境獣医科学講座放射線学教室
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Kuwabara Mikinori
弘前大学 保健学研究科放射線生命科学
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Kuwabara Mikinori
Laboratory Of Radiation Biology Graduate School Of Veterinary Medicine
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Asanuma Taketoshi
Laboratory Of Radiation Biology Department Of Environmental Veterinary Sciences Graduate School Of V
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Asanuma Taketoshi
Laboratory Of Radiation Biology Department Of Environmental Veterinary Medicine Graduate School Of V
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Asanuma Taketoshi
Depertment Of Radiation Biology Faculty Of Veterinary Medicine Hokkaido University
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Inanami Osamu
弘前大学 保健学研究科放射線生命科学
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Inanami Osamu
Laboratory Of Radiation Biology Graduate School Of Veterinary Medicine Hokkaido University
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KUWABARA Mikinori
Labs. Radiat. Biol.
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Kuwabara M
Hokkaido Univ. Sapporo Jpn
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Yasui Hironobu
Laboratory Of Radiation Biology Department Of Environmental Veterinary Sciences Graduate School Of V
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Inanami Osamu
Lab. Radiat. Biol. Grad. Sch. Vet. Med. Hokkaido Univ.
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Kuwabara Mikinori
Lab. Radiat. Biol. Grad. Sch. Vet. Med. Hokkaido Univ.
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