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Imai S.,Osaka Prefecture University | Matsuda M.,Kajiyama Clinic | Hasegawa G.,Kyoto Prefectural University of Medicine | Fukui M.,Kyoto Prefectural University of Medicine | And 4 more authors.
Asia Pacific Journal of Clinical Nutrition | Year: 2011

This study aimed to determine whether educating diabetic patients to 'eat vegetables before carbohydrate' was as effective on long-term glycemic control as a traditional exchange-based meal plan. To test this hypothesis, we carried out a randomized, controlled trial in patients with type 2 diabetes that compared changes in HbA1c as the primary outcome. A total of 101 patients were stratified according to sex, age, BMI, duration of diabetes, and HbA1c, and then randomized to receive instructions to eat either vegetables before carbohydrate (VBC, n=69) or an exchange-based meal plan (EXB, n=32). The impact of the two plans on glycemic control was compared over 24 months of follow-up. Significant improvements in HbA1c over 24 months were observed in both groups (VBC, 8.3 to 6.8% vs EXB, 8.2 to 7.3%). HbA1c levels were significantly lower in the VBC group than in the EXB group after 6, 9, 12 and 24 months of the study. Both groups exhibited similar improvements in dietary practices with respect to intake of carbohydrate, fats and sweets, while the VBC group had a significant increase in consumption of green vegetables and a significant decrease in fruit consumption. A simple meal plan of 'eating vegetables before carbohydrate' achieved better glycemic control than an exchange-based meal plan in Japanese patients with type 2 diabetes over a 24-month period.

Fukui M.,Kyoto Prefectural University of Medicine | Senmaru T.,Kyoto Prefectural University of Medicine | Hasegawa G.,Kyoto Prefectural University of Medicine | Yamazaki M.,Kyoto Prefectural University of Medicine | And 11 more authors.
Biochemical and Biophysical Research Communications | Year: 2011

Senescence marker protein-30 (SMP30) plays an important role in intracellular Ca 2+ homeostasis. The aim of the present study was to investigate the effects of estrogens on liver apoptotic damage and changes in SMP30 expression induced by a high saturated fatty acid diet (HSFD). Ovariectomized mice (OVX) and sham-operated mice (SHAM) were randomly divided into five groups: SHAM fed a normal diet (SHAM/ND), SHAM fed HSFD (SHAM/HSFD), OVX fed ND (OVX/ND), OVX fed HSFD (OVX/HSFD) and OVX fed HSFD with 17β-estradiol (E2) supplementation using an implanted slow-release pellet (OVX/HSFD+E2). After 8weeks, markers of endoplasmic reticulum (ER) stress and apoptosis, and levels of tumor necrosis factor-α (TNFα and SMP30 expression were investigated. Compared with SHAM/ND, OVX/HSFD mice showed significantly increased spliced X-box protein-1 (s-XBP1), phosphorylated eukaryotic initiation factor-2α (p-eIF2α), glucose-regulated protein 78 (GPR78), C/EBP homologous protein (CHOP), cytosolic cytochrome c, caspase-3 activity, and TNFα, and significantly decreased SMP30. These differences in OVX/HSFD mice were restored to the levels of SHAM/ND mice by E2 supplementation. These results suggest that E2 supplementation attenuates HSFD-induced liver apoptotic death in ovariectomized mice by up-regulating SMP30. © 2011 Elsevier Inc..

Kadoya M.,Kyoto Prefectural University of Medicine | Yamamoto A.,Kyoto Prefectural University of Medicine | Hamaguchi M.,Kyoto Prefectural University of Medicine | Obayashi H.,Institute of Bio Response Informatics | And 7 more authors.
Biochemical and Biophysical Research Communications | Year: 2014

Allograft inflammatory factor-1 (AIF-1) is expressed by macrophages, fibroblasts, endothelial cells and smooth muscle cells in immune-inflammatory disorders such as systemic sclerosis, rheumatoid arthritis and several vasculopathies. However, its molecular function is not fully understood. In this study, we examined gene expression profiles and induction of chemokines in monocytes treated with recombinant human AIF (rhAIF-1). Using the high-density oligonucleotide microarray technique, we compared mRNA expression profiles of rhAIF-1-stimulated CD14+ peripheral blood mononuclear cells (CD14+ PBMCs) derived from healthy volunteers. We demonstrated upregulation of genes for several CC chemokines such as CCL1, CCL2, CCL3, CCL7, and CCL20. Next, using ELISAs, we confirmed that rhAIF-1 promoted the secretion of CCL3/MIP-1α and IL-6 by CD14+ PBMCs, whereas only small amounts of CCL1, CCL2/MCP-1, CCL7/MCP-3 and CCL20/MIP-3α were secreted. Conditioned media from rhAIF-1stimulated CD14+ PBMCs resulted in migration of PBMCs. These findings suggest that AIF-1, which induced chemokines and enhanced chemotaxis of monocytes, may represent a molecular target for the therapy of immune-inflammatory disorders. © 2014 Elsevier Inc. All rights reserved.

Okada H.,Kyoto Prefectural University of Medicine | Senmaru T.,Kyoto Prefectural University of Medicine | Fukui M.,Kyoto Prefectural University of Medicine | Kondo Y.,Tokyo Metropolitan University | And 6 more authors.
Journal of Diabetes Investigation | Year: 2015

Aims/Introduction: Senescence marker protein-30 (SMP30) is abundantly expressed in renal proximal tubule cells, but its expression decreases with age. Previous studies have shown that reduced SMP30 expression could contribute to aging-associated deterioration of cellular function and tissue injury. In the present study, we investigated the effects of SMP30 deficiency on the pathogenesis of diabetic nephropathy. Materials and Methods: Diabetes was induced using streptozotocin in male SMP30 knockout mice (KO) and wild-type mice at 7 weeks-of-age. Vitamin C was added to the drinking water to prevent vitamin C deficiency in KO mice. The mice were killed 12 weeks after the induction of diabetes. Results: Urinary biomarkers for proximal tubule damage were significantly increased in non-diabetic KO mice compared with wild-type mice. Furthermore, diabetes-induced tubular damage was significantly exacerbated by SMP30 deletion. Morphological analysis showed a link between cortical tubulointerstitial fibrosis area and the degree of tubular damage. However, SMP30 deletion did not affect mesangial expansion. Tubular injury was associated with accumulation of hypoxia-inducible factor-1α and increased hypoxia-inducible factor-1α targeted gene expression. SMP30 deletion initiated oxidative stress; however, it did not exacerbate the oxidative stress seen in diabetic mice. In contrast, tubular inflammation was associated with SMP30 deletion only in diabetic mice. Conclusions: Based on this evidence, we concluded that SMP30 deficiency exacerbates proximal tubule injury in diabetic mice. Decreased SMP30 could contribute to the increased incidence of various chronic kidney diseases, including diabetic nephropathy, with age. Decreased SMP30 may contribute to the increased incidence of various chronic kidney diseases, including diabetic nephropathy, with age. © 2014 The Authors. Journal of Diabetes Investigation published by Asian Association of the Study of Diabetes (AASD) and Wiley Publishing Asia Pty Ltd.

Hasegawa G.,Kyoto Prefectural University of Medicine | Yamasaki M.,Kyoto Prefectural University of Medicine | Kadono M.,Kyoto Prefectural University of Medicine | Tanaka M.,Kyoto Prefectural University of Medicine | And 8 more authors.
Endocrinology | Year: 2010

Senescence marker protein-30 (SMP30) is an androgen-independent factor that decreases with age. We recently identified SMP30 as the lactone-hydrolyzing enzyme gluconolactonase (GNL), which is involved in vitamin C biosynthesis in animal species. To examine whether the age-related decrease in SMP30/GNL has effects on glucose homeostasis, we used SMP30/GNL knockout (KO) mice treated with L-ascorbic acid. In an ip glucose tolerance test at 15 wk of age, blood glucose levels in SMP30/GNL KO mice were significantly increased by 25% at 30 min after glucose administration compared with wildtype( WT)mice.Insulin levels inSMP30/GNLKOmiceweresignificantlydecreasedby37%at30minafter glucose compared with WT mice. Interestingly, an insulin tolerance test showed a greater glucoselowering effect in SMP30/GNL KO mice. High-fat diet feeding severely worsened glucose tolerance in both WT and SMP30/GNL KO mice. Morphometric analysis revealed no differences in the degree of high-fat diet-induced compensatory increase in β-cell mass and proliferation. In the static incubation study of islets, insulin secretion in response to 20 mM glucose or KCl was significantly decreased in SMP30/GNLKOmice.Onthe other hand, islet ATP content at 20mMin SMP30/GNLKOmice was similar to that in WT mice. Collectively, these data indicate that impairment of the early phase of insulin secretion due to dysfunction of the distal portion of the secretion pathway underlies glucose intolerance in SMP30/GNL KO mice. Decreased SMP30/GNL may contribute to the worsening of glucose tolerance that occurs in normal aging. Copyright © 2010 by The Endocrine Society.

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