BACKGROUND Akt plays diverse roles in humans.It is involved in the pathogenesis of type 2 diabetes mellitus(T2DM),which is caused by insulin resistance.Akt also plays a vital role in human platelet activation.Furtherm...BACKGROUND Akt plays diverse roles in humans.It is involved in the pathogenesis of type 2 diabetes mellitus(T2DM),which is caused by insulin resistance.Akt also plays a vital role in human platelet activation.Furthermore,the hippocampus is closely associated with memory and learning,and a decrease in hippocampal volume is reportedly associated with an insulin-resistant phenotype in T2DM patients without dementia.AIM To investigate the relationship between Akt phosphorylation in unstimulated platelets and the hippocampal volume in T2DM patients.METHODS Platelet-rich plasma(PRP)was prepared from the venous blood of patients with T2DM or age-matched controls.The pellet lysate of the centrifuged PRP was subjected to western blotting to analyse the phosphorylation of Akt,p38 mitogen-activated protein(MAP)kinase and glyceraldehyde 3-phosphate dehydrogenase(GAPDH).Phosphorylation levels were quantified by densitometric analysis.Hippocampal volume was analysed using a voxel-based specific regional analysis system for Alzheimer’s disease on magnetic resonance imaging,which proposes the Z-score as a parameter that reflects hippocampal volume.RESULTS The levels of phosphorylated Akt corrected with phosphorylated p38 MAP kinase were inversely correlated with the Z-scores in the T2DM subjects,whereas the levels of phosphorylated Akt corrected with GAPDH were not.However,this relationship was not observed in the control patients.CONCLUSION These results suggest that an inverse relationship may exist between platelet Akt activation and hippocampal atrophy in T2DM patients.Our findings provide insight into the molecular mechanisms underlying T2DM hippocampal atrophy.展开更多
Background: Older diabetic patients are more likely to be frail than those who do not have diabetes. Frailty is an important risk factor for both mortality and disability in older patients with type 2 diabetes. Howeve...Background: Older diabetic patients are more likely to be frail than those who do not have diabetes. Frailty is an important risk factor for both mortality and disability in older patients with type 2 diabetes. However, the mechanism of frailty in diabetes mellitus is not fully understood. Aims: The aim of this study was to identify the prevalence of frailty and associated factors in older patients with type 2 diabetes in Japan. Methods: A cross-sectional study was conducted with a total of 178 outpatients who were over 65 years old with type 2 diabetes. We used the Obu Study Health Promotion for the Elderly definition of frailty to divided subjects into a non-frail and a frail group. We investigated the association between frailty and various patient characteristics. Results: In the study, 21.4% of the older patients with type 2 diabetes were considered frail. There were no significant differences in the duration of diabetes, BMI, proportion of microvascular complications, or HbA1c values between the frail and non-frail group. However, serum albumin and IGF-1 levels were lower in the frail group than the non-frail group as were the Mini-Mental State Examination scores. The frail group had a higher number of medications than the non-frail group. In a multivariable analysis, frailty was positively associated with the number of medications and, lower levels of both serum albumin and IGF-1. Conclusion: Our study suggests that diabetes accelerates the aging process and frailty is associated with low albumin, polypharmacy and low levels of IGF-1.展开更多
基金Research Funding for Longevity Science from The National Center for Geriatrics and Gerontology,Japan,No.19-21and No.22-19.
文摘BACKGROUND Akt plays diverse roles in humans.It is involved in the pathogenesis of type 2 diabetes mellitus(T2DM),which is caused by insulin resistance.Akt also plays a vital role in human platelet activation.Furthermore,the hippocampus is closely associated with memory and learning,and a decrease in hippocampal volume is reportedly associated with an insulin-resistant phenotype in T2DM patients without dementia.AIM To investigate the relationship between Akt phosphorylation in unstimulated platelets and the hippocampal volume in T2DM patients.METHODS Platelet-rich plasma(PRP)was prepared from the venous blood of patients with T2DM or age-matched controls.The pellet lysate of the centrifuged PRP was subjected to western blotting to analyse the phosphorylation of Akt,p38 mitogen-activated protein(MAP)kinase and glyceraldehyde 3-phosphate dehydrogenase(GAPDH).Phosphorylation levels were quantified by densitometric analysis.Hippocampal volume was analysed using a voxel-based specific regional analysis system for Alzheimer’s disease on magnetic resonance imaging,which proposes the Z-score as a parameter that reflects hippocampal volume.RESULTS The levels of phosphorylated Akt corrected with phosphorylated p38 MAP kinase were inversely correlated with the Z-scores in the T2DM subjects,whereas the levels of phosphorylated Akt corrected with GAPDH were not.However,this relationship was not observed in the control patients.CONCLUSION These results suggest that an inverse relationship may exist between platelet Akt activation and hippocampal atrophy in T2DM patients.Our findings provide insight into the molecular mechanisms underlying T2DM hippocampal atrophy.
文摘Background: Older diabetic patients are more likely to be frail than those who do not have diabetes. Frailty is an important risk factor for both mortality and disability in older patients with type 2 diabetes. However, the mechanism of frailty in diabetes mellitus is not fully understood. Aims: The aim of this study was to identify the prevalence of frailty and associated factors in older patients with type 2 diabetes in Japan. Methods: A cross-sectional study was conducted with a total of 178 outpatients who were over 65 years old with type 2 diabetes. We used the Obu Study Health Promotion for the Elderly definition of frailty to divided subjects into a non-frail and a frail group. We investigated the association between frailty and various patient characteristics. Results: In the study, 21.4% of the older patients with type 2 diabetes were considered frail. There were no significant differences in the duration of diabetes, BMI, proportion of microvascular complications, or HbA1c values between the frail and non-frail group. However, serum albumin and IGF-1 levels were lower in the frail group than the non-frail group as were the Mini-Mental State Examination scores. The frail group had a higher number of medications than the non-frail group. In a multivariable analysis, frailty was positively associated with the number of medications and, lower levels of both serum albumin and IGF-1. Conclusion: Our study suggests that diabetes accelerates the aging process and frailty is associated with low albumin, polypharmacy and low levels of IGF-1.
