Fukuoka-shi, Japan

Nakamura Gakuen University

Fukuoka-shi, Japan

Nakamura Gakuen University is a private university in Fukuoka, Fukuoka, Japan. The predecessor of the school was founded in 1954. It was chartered as a junior college in 1957 and became a four-year college in 1965. Wikipedia.

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Uchiyama F.,Nakamura Gakuen University | Jikyo T.,Nakamura Gakuen University | Takeda R.,Nakamura Gakuen University | Ogata M.,Nakamura Gakuen University
Journal of Ethnopharmacology | Year: 2014

Ethnopharmacological relevance Lepidium meyenii (Maca) is traditionally employed in the Andean region for its supposed fertility benefits. This study investigated the effect of Maca on the serum pituitary hormone levels during the pro-oestrus phase. Materials and methods Maca powder was made from the tubers of Lepidium meyenii Walp collected, dried, and reduced to powder at the plantation in Junín Plateau and was purchased from Yamano del Perú SAC. The Maca powder was identified by chemical profiling and taxonomic methods. Two groups of female Sprague-Dawley rats were provided feed with normal feed containing 5%, 25%, or 50% Maca powder ad libitum for 7 weeks. At 1800 h of the proestrus stage, the rats were euthanised, and blood samples were collected for serum isolation. The serum pituitary hormone levels were measured using enzyme-linked immunosorbent assays (ELISAs). Results No significant differences in feed intake or growth rate were observed among the rats. During the pro-oestrus stage, a 4.5-fold increase (P<0.01) in luteinising hormone (LH) and a 19-fold increase (P<0.01) in follicle-stimulating hormone (FSH) were observed in the sera of rats fed with 50% Maca powder compared with the control rats. No significant differences were observed in the levels of the other pituitary hormones, including growth hormone (GH), prolactin (PRL), adrenocorticotropic hormone (ACTH), and thyroid-stimulating hormone (TSH). A dose-dependent increase of LH serum levels was observed within the range of 3-30 g Maca/kg. Furthermore, the enhancement of the LH serum levels was specific to the pro-oestrus LH surge. Conclusions The present study demonstrates that Maca uniquely enhances the LH serum levels of pituitary hormones in female rats during the pro-oestrus LH surge and acts in a pharmacological, dose-dependent manner. These findings support the traditional use of Maca to enhance fertility and suggest a potential molecular mechanism responsible for its effects. © 2013 Elsevier Ireland Ltd.

Kudo H.,Hokkaido University | Doi Y.,University of Occupational and Environmental Health Japan | Fujimoto S.,Nakamura Gakuen University
Neuroscience Letters | Year: 2010

The xenobiotic metabolizing system is considered to play important roles in the olfaction by the chemical homeostasis. Several phase I and phase II xenobiotic metabolizing enzymes are expressed in the olfactory epithelium in vertebrates. Multidrug resistance-related proteins (MRPs) are the phase III xenobiotic metabolizing pumps that eliminate some conjugated ligands from cells. However, the MRP-expressions in the olfactory epithelium have not been confirmed in the mammals. We investigated gene and protein expressions of MRP type 1 (MRP1) and type 2 (MRP2) isoforms in the adult rat olfactory epithelium in order to clarify the existence of phase III xenobiotic metabolizing pumps in the olfactory organs. Expressions of MRP1 mRNA were detected in the nasal cavity by reverse transcriptase polymerase chain reaction (RT-PCR). The nucleoside sequence of the RT-PCR products were completely identical to that found in other organs of rat. On the contrary, the analysis did not detect expressions of MRP2 mRNA in the nasal cavity. By in situ hybridization using a digoxigenin-labeled MRP1 cRNA probe, signals for MRP1 mRNA were observed preferentially in the perinuclear regions of supporting cells. However, the respiratory epithelial cells did not show the signals for MRP1 mRNA. By immunohistochemistry using a specific antibody to MRP1, MRP1-immunoreactivities were seen mainly on the supporting cells. These findings suggest that MRP1 is involved in olfaction as a part of the "olfactory signal termination" by the chemical homeostasis in the "perireceptor events" of the olfactory epithelium. © 2009 Elsevier Ireland Ltd. All rights reserved.

Ozawa M.,Kyushu University | Ninomiya T.,Kyushu University | Ohara T.,Kyushu University | Doi Y.,Kyushu University | And 5 more authors.
American Journal of Clinical Nutrition | Year: 2013

Background: To our knowledge, there are no previous reports that assessed the association between dietary patterns and risk of dementia in Asian populations. Objective: We investigated dietary patterns and their potential association with risk of incident dementia in a general Japanese population. Design: A total of 1006 community-dwelling Japanese subjects without dementia, aged 60-79 y, were followed up for a median of 15 y. The reduced rank regression procedure was used to efficiently determine their dietary patterns. Estimated risk conferred by a particular dietary pattern on the development of dementia was computed by using a Cox proportional hazards model. Results: Seven dietary patterns were extracted; of these, dietary pattern 1 was correlated with high intakes of soybeans and soybean products, vegetables, algae, and milk and dairy products and a low intake of rice. During the follow-up, 271 subjects developed allcause dementia. Of these individuals, 144 subjects had Alzheimer disease (AD), and 88 subjects had vascular dementia (VaD). After adjustment for potential confounders, risks of development of allcause dementia, AD, and VaD were reduced by 0.66 (95% CI: 0.46, 0.95), 0.65 (95% CI: 0.40, 1.06), and 0.45 (95% CI: 0.22, 0.91), respectively, in subjects in the highest quartile of score for dietary pattern 1 compared with subjects in the lowest quartile. Conclusion: Our findings suggest that a higher adherence to a dietary pattern characterized by a high intake of soybeans and soybean products, vegetables, algae, and milk and dairy products and a low intake of rice is associated with reduced risk of dementia in the general Japanese population. © 2013 American Society for Nutrition.

Suwa M.,Tohoku Institute of Technology | Nakano H.,Nakamura Gakuen University | Radak Z.,Semmelweis University | Kumagai S.,Kyushu University
Metabolism: Clinical and Experimental | Year: 2011

Adenosine monophosphate-activated protein kinase (AMPK) has been proposed to stimulate mitochondrial biogenesis and fat and glucose metabolism in skeletal muscle. Nicotinamide adenine dinucleotide-dependent histone deacetylase sirtuin 1 (SIRT1) is also thought to play a pivotal role for such metabolic adaptations. The purpose of the present study was to examine the effect of AMPK activation with the administration of AMPK activator 5-aminoimidazole-4- carboxamide-1-β-d-ribofuranoside (AICAR) to rats on skeletal muscle SIRT1 protein expression as well as peroxisome proliferator activated receptor γ coactivator-1α (PGC-1α) and glucose transporter 4 (GLUT4) protein expression and hexokinase activity. The AICAR promoted the phosphorylation of AMPK α-subunit (Thr172) and acetyl-coenzyme A carboxylase (Ser79) without any change of total AMPK α-subunit or acetyl-coenzyme A carboxylase protein levels in both the slow-twitch soleus and fast-twitch extensor digitorum longus (EDL) muscles. The SIRT1 protein expression increased at 24 hours after administration of AICAR in the EDL muscle but not in the soleus muscle. The PGC-1α protein expression increased in both the soleus and EDL muscles and GLUT4 did in the EDL muscle at 24 hours after an administration of AICAR. The hexokinase activity increased at 18 and 24 hours in the soleus and at 12, 18, and 24 hours in the EDL after an AICAR treatment. These results suggest that short-term AICAR treatment to rats promotes skeletal muscle AMPK phosphorylation and then coincidently increases the SIRT1 protein expression. In addition, such treatment also enhances the PGC-1α and GLUT4 protein contents and hexokinase activity in skeletal muscle. Crown Copyright © 2011 Published by Elsevier Inc. All rights reserved.

Tokifuji A.,Nakamura Gakuen University | Matsushima Y.,University of Occupational and Environmental Health Japan | Hachisuka K.,University of Occupational and Environmental Health Japan | Yoshioka K.,Nakamura Gakuen University
Meat Science | Year: 2013

To develop a soft meat product for a dysphagia diet, high-pressure technology was applied. Pressure-heat-treated ground pork meat (PH) was prepared from ground pork mixed with water (ground meat: water, 1:0.5 or 1:1) and salt (1.5%). PH-gels were made from these meat homogenates by treatment at 400. MPa for 20. min, followed by heat treatment. Heat-treated pork meat homogenates (H) were also prepared. The hardness and adhesiveness of the 1:1PH-gel was lower than those of the 1:1H-gel. The PH-gel scored higher in sensory evaluations of elasticity, smoothness and ease of swallowing. Scanning electron micrographs indicated that the superior textural property of the 1:1PH-gel was caused by a network of myosin filaments. Videofluoroscopic examination of swallowing revealed that the 1:1PH-gel was easy to swallow and left little residue in the oropharynx. These results proved the utility of pressurization in creating a dysphagia meat diet. © 2012 Elsevier Ltd.

Takeshima M.,Nakamura Gakuen University | Ono M.,Nakamura Gakuen University | Higuchi T.,Nakamura Gakuen University | Chen C.,Nakamura Gakuen University | And 2 more authors.
Cancer Science | Year: 2014

Although lycopene, a major carotenoid component of tomatoes, has been suggested to attenuate the risk of breast cancer, the underlying preventive mechanism remains to be determined. Moreover, it is not known whether there are any differences in lycopene activity among different subtypes of human breast cancer cells. Using ER/PR positive MCF-7, HER2-positive SK-BR-3 and triple-negative MDA-MB-468 cell lines, we investigated the cellular and molecular mechanism of the anticancer activity of lycopene. Lycopene treatment for 168 consecutive hours exhibited a time-dependent and dose-dependent anti-proliferative activity against these cell lines by arresting the cell cycle at the G0/G1 phase at physiologically achievable concentrations found in human plasma. The greatest growth inhibition was observed in MDA-MB-468 where the sub-G0/G1 apoptotic population was significantly increased, with demonstrable cleavage of PARP. Lycopene induced strong and sustained activation of the ERK1/2, with concomitant cyclin D1 suppression and p21 upregulation in these three cell lines. In triple negative cells, lycopene inhibited the phosphorylation of Akt and its downstream molecule mTOR, followed by subsequent upregulation of proapoptotic Bax without affecting anti-apoptotic Bcl-xL. Taken together, these data indicate that the predominant anticancer activity of lycopene in MDA-MB-468 cells suggests a potential role of lycopene for the prevention of triple negative breast cancer. © 2014 The Authors. Cancer Science published by Wiley Publishing Asia Pty Ltd on behalf of Japanese Cancer Association.

Chen C.,Nakamura Gakuen University | Ono M.,Nakamura Gakuen University | Takeshima M.,Nakamura Gakuen University | Nakano S.,Nakamura Gakuen University
Anticancer Research | Year: 2014

Although nobiletin has a potent antitumor activity against several types of human cancers, its inhibitory effects and possible mechanisms of action on breast cancer cells with different hormone receptor and HER2 status remains unknown. Materials and Methods: Using hormone receptorpositive MCF-7, HER2-positive SK-BR-3, and triple-negative MDA-MB-468 cell lines, we investigated the antitumor mechanisms of nobiletin. Results: Nobiletin exhibited doseand time-dependent antitumor activity against these different subtypes of cell lines, with the greatest inhibition observed against the MDA-MB-468 cell line. Nobiletin induced cellcycle arrest at the G0/G1 phase by suppressing ERK1/2 activity, with concomitant cyclin-D1 suppression and p21 upregulation. Nobiletin induced apoptotic cell death by reducing Bcl-xL expression, without affecting Bax levels, and inhibited the activity of AKT and downstream mTOR in MDA-MB-468 cells, but not in other cell lines. Conclusion: The predominant anticancer activity of nobiletin in MDA-MB-468 cells suggests a potential role of nobiletin for the prevention of triple-negative breast cancer.

Ohta C.,Nakamura Gakuen University
Fukuoka igaku zasshi = Hukuoka acta medica | Year: 2013

The in vitro metabolism of 2, 2', 3, 4', 5, 5'-hexachlorobiphenyl (hexaCB) (CB146) was examined using liver microsomes of rats, guinea pigs, hamsters and human. Untreated animal livers produced one metabolite (M-2) in rats, three metabolites (M-l, M-2 and M-3) in guinea pigs and no metabolite in hamsters. Pretreatment of phenobarbital (PB) resulted in a marked increase of M-1 in three animals and of M-2 in guinea pigs. In contrast, pretreatment of 3-methylcholanthrene showed a significant increase of M-3 in guinea pigs and a decrease of M-2 in rats. Human liver microsomes prepared from nine Caucasians mainly formed M-2 and M-3 at a ratio of 2 : 1 and two individuals also formed one more metabolite M-1. The formation of M-1 was significantly correlated with CYP2B6 activity. By comparison of the GC-MS data of three metabolites with synthesized authentic samples, M-1 and M-2 were determined to be 3'-hydroxy (OH)-CB146 and 4-OH-CB146, respectively. However, M-3 is unclear at present except the fact that it is OH-hexaCB. These results suggest that 3'-OH-CB146 is formed by PB-inducible cytochrome P450 (CYP2B enzymes) in animal and human livers and 4-OH-CB146 is a major metabolite in rat and human liver.

Ono M.,Nakamura Gakuen University | Higuchi T.,Nakamura Gakuen University | Takeshima M.,Nakamura Gakuen University | Chen C.,Nakamura Gakuen University | Nakano S.,Nakamura Gakuen University
Biochemical and Biophysical Research Communications | Year: 2013

Although curcumin has been studied as a potential anticancer drug targeting multiple signaling molecules, the role of oncogenic Src and Ras in curcumin sensitivity remains unknown. Using HAG-1 human adenocarcinoma cells transfected with either activated Src or Ras, we investigated here the functional role of these oncogenes in curcumin sensitivity. Activation of either Src or Ras did not confer resistance to curcumin, compared to vehicle-transfected cells. Curcumin enhanced Erk1/2 predominantly in Ras-activated cells, but inhibited Akt and its downstream molecules (mTOR and S6K1) regardless of these oncogene activations. The sub-G0/G1 apoptotic populations were substantially increased with demonstrable cleavage of PARP, but this increase was most prominent in Src-activated cells. Suppression of Bcl-xL level and enhanced expression of Bax were demonstrated in Src-activated, but not Ras-activated cells. By contrast, drastic increases of G2/M cell populations were seen in Ras-activated cells rather than Src-activated cells, suggesting a potential role of Ras/Erk1/2 activation in curcumin-induced G2/M arrest. These data indicate that curcumin-induced growth inhibition would be mediated mainly by G2/M arrest in Ras-driven cells but by apoptosis induction in Src-driven cells, providing a mechanistic rationale for the potential use of curcumin in the treatment of human cancers with activated Src or Ras. © 2013 Elsevier Inc.

Ono M.,Nakamura Gakuen University | Higuchi T.,Nakamura Gakuen University | Takeshima M.,Nakamura Gakuen University | Chen C.,Nakamura Gakuen University | Nakano S.,Nakamura Gakuen University
Anticancer Research | Year: 2013

Aim: Curcumin has potent antitumor activity against many types of human cancers. However, the inhibitory effects and possible mechanisms of curcumin on gallbladder cancer remains to be determined. Materials and Methods: Using HAG-1 human gallbladder adenocarcinoma cells, we investigated the effects of curcumin on cell proliferation, apoptosis, cell-cycle perturbation, and signal proteins for survival, proliferation, and apoptosis. Results: Curcumin exhibited dose-dependent antitumor activity against HAG-1 cells, arresting the cells in G2/M phase, with progressive expansion of the apoptotic cell population. Upon curcumin treatment, AKT activation was substantially suppressed, with subsequent reduction of activities of mammalian target of rapamycin (mTOR) and its downstream molecules S6 kinase-1 (S6K1) and elF4E-binding protein-1 (4E-BP1), but constitutive activity of extracellular signal-regulated kinase (ERK1/2) was clearly enhanced. Curcumin reduced the expression and phosphorylation of anti-apoptotic Bcl-2, but did not affect the expressions of pro-apoptotic Bax and anti-apoptotic nuclear factor (NF-κB). Conclusion: These results suggest that curcumin induces G 2/M arrest and apoptosis through multiple mechanisms involving enhanced mitogen-activated protein (MAP) kinase activity, reduced AKT-mTOR activity, and reduced Bcl-2 function. These data provide a mechanistic rationale for the potential use of curcumin in the treatment of gallbladder cancer.

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