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Articles by M. Furuse
Total Records ( 8 ) for M. Furuse
  K. Hamasu , K. Shigemi , Y. Tsuneyoshi , H. Sato , D.M. Denbow and M. Furuse
  The aim of the present study was to determine whether the sedative effects of L-proline are associated with the modulation of cholinergic neurotransmission. We investigated the effect of co-injection of L-proline with scopolamine, a Muscarinic Acetylcholine Receptor (M-AChR) antagonist, on behavior of neonatal chicks under isolation-induced stress. Intracerebroventricular (i.c.v.) injection of L-proline reduced spontaneous activity and the number of distress vocalizations, while co-injected scopolamine did not attenuate this effect implying that the M-AChR was not involved in the sedative effects induced by L-proline. In addition, the effect of L-proline on acetylcholineesterase activity in the telencephalon and diencephalon of chicks was investigated. No significant changes in acetylcholineesterase activity were observed in either the telencephalon or diencephalon. These results indicate that the sedative effects induced by L-proline are not mediated by the cholinergic system.
  Y. Akimoto , D. Oikawa , S. Tsuyama and M. Furuse
  Deafferentation can be achieved by neonatal capsaicin treatment in rats. We estimated that itchy sensation would be attenuated by neonatal capsaicin treatment, because itchy sensation is transmitted to the central nervous system via primary afferent C-fibers in the spinothalamic tract. To reveal neonatal deafferentation modify the scratching behavior induced by pruritogenic agents in rats, we treated neonatal rats with capsaicin to deafferent C-fibers and performed behavioral tests using pruritogenic agents. Deafferentation by capsaicin was successful, as evidenced by the decreased number of eye wipings induced by NaOH compared with the control rats. Histamine or compound 48/80, mast cell degranulationg agent, was injected subcutaneously as a pruritogenic agents and then scratching behavior was monitored over 30 min. No significant differences were detected between capsaicin-treated and control groups. These results suggest that neonatal deafferentation does not modify scratching behavior induced by pruritogenic agents in rats and itch-specific C-fibers are not destroyed by neonatal capsaicin treatment or deafferentation activates other itchy pathway.
  Y. Akimoto , D. Oikawa and M. Furuse
  There is little information about itch-associated responses in neonatal rodents. We performed behavioral tests to elucidate itch-associated scratching and wriggling behaviors induced by compound 48/80 (C48/80) in 7- and 14-day-old rats. C48/80 (2.5 g g 1 body weight per 5 L) was s.c injected into the rostral part of the back of neonatal rats. Immediately after injection, their behavior was recorded for 30 min using a digital video camera under unmanned conditions. A series of scratching behaviors were counted as one bout of scratching. Total wriggling time was also monitored. Scratching behavior was observed in both ages, whereas wriggling behavior was seen only in 7-day-old rats. These results suggest that wriggling behavior is limited early in life and neonatal rats are available to reveal mechanisms of itch sensation and scratching behavior provoked by diseases specific to neonates or infants.
  M. Sato , T. Tachibana , A. Tsukada and M. Furuse
  Plasma Prolactin (PRL) and Corticosterone (CORT) concentrations in broiler- and layer-type chickens were compared during embryonic development (14 and 18 days of incubation (E14 and E18)) and at hatch (P0). Plasma PRL concentrations were comparable and kept low in both types during embryonic development, but the value sharply increased at P0 with special reference to layers. Plasma CORT concentrations were similar and gradually increased toward P0 in both types and the values in layers were higher than in broilers at P0. The results obtained here suggest that plasma PRL and CORT concentrations were influenced by genetic selection just after hatching, but not during embryonic development.
  H. Yamane , S. Tomonaga , R. Suenaga , D.M. Denbow and M. Furuse
  It is well known that a single deficiency or excess of a Sulfur-containing Amino Acid (SAA), a major determinant of the glutathione concentration in some tissues, decreased food intake of chicks. To clarify the central function of glutathione on food intake, the effect of intracerebroventricular (i.c.v.) injection of reduced Glutathione (GSH) (0.5, 1.0, 2.0 µmol) was investigated in fasting neonatal chicks. Food intake was suppressed by GSH in a dose-dependent manner over 120 min. It was suggested that the reduction in food intake induced by SAA excess, but not SAA deficiency, may be associated with GSH in the brain.
  T. Haraguchi , S. Tomonaga , I. Kurauchi , K. Hamasu , H. Sato , D.M. Denbow and M. Furuse
  Although, the central function of amino acids on food intake has been investigated, little information is available on the role of the amino acid L-proline. To clarify the central effect, several doses (0, 0.25, 0.5 and 1.0 mg) of L-proline were intracerebroventricularly (i.c.v.) injected into chicks under fasting (3 h) or ad libitum feeding conditions. Food intake was determined through 60 min post injection. Under fasting conditions, the following regression equation was obtained: food intake (g) = 3.047 + 3.496x 5.332 x2 (x in mg of L-proline, R2 = 0.466, RMS = 1.056). Similarly, the regression equation was obtained under ad libitum conditions as follows: food intake (g) = 0.479 (SE 0.164) + 2.130 (SE 0.815)x 2.452 (0.747)x2 (R2 = 0.313, RMS = 0.487). These results indicated that food intake was mildly stimulated by low levels of L-proline, but was suppressed by high levels in chicks. It is suggested that L-proline may act in the central nervous system to differentially regulate food intake, depending upon dose.
  D. Oikawa , H. Ando , K. Mishiro , K. Miyake and M. Furuse
  The present study was done to clarify whether dietary hydroxyproline (Hyp) was effective for improvement of collagen contents of the fillet in tiger puffer (Takifugu rubripes). We investigated collagen contents in the cranial, middle and caudal parts of the fillet in Experiment 1. The caudal part of the fillet had a high level of collagen compared with other two parts. In Experiment 2, effects of dietary Hyp (1%) on the performance and collagen contents of the fillet were determined at 37 and 81 days of feeding. Growth and feed efficiency was comparable between the control and Hyp groups over the experimental period. Collagen contents were decreased with growth in the control group, but dietary Hyp prevented the reduction in collagen contents in the fillet.
  M. Sato , Y. Tsuneyoshi , K. Sato and M. Furuse
  The activity of 3-Hydroxyacyl CoA Dehydrogenase (3-HADH), rate limiting enzyme relating fatty acid oxidation, in broiler and layer embryos was compared, because their growth and lipid metabolism are largely different during embryogenesis. The 3-HADH activity in the liver was constant from the embryonic stage to the hatch, but the activity was significantly higher in broilers than in layers.
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