[Contributions of impaired adult hippocampal neurogenesis to occurrence and development of diabetic encephalopathy].

Diabetic encephalopathy (DE) is one of the most common complications of diabetes mellitus (DM). Persistent hyperglycemia in DM patients may induce numerous pathophysiological changes, such as chronic inflammation, increased permeability of blood-brain barrier, impaired neurogenesis, and brain atrophy, which eventually impair cognitive function. The dentate gyrus (DG) of hippocampus is a crucial region for learning and memory, as well as adult neurogenesis in mammals. Recent studies have shown that adult hippocampal neurogenesis (AHN) exists throughout life and is decreased with age, whereas AHN is significantly impaired in DE. Therefore, numerous efforts are currently focused on exploring the mechanisms underlying cognitive impairment induced by AHN dysfunction in DE. Here, we summarize studies on the contributions of AHN disorders to the occurrence and development of DE and related mechanisms, in order to shed light on the prevention and treatment of DE.

Prevalence and risks of mild cognitive impairment of Chinese community-dwelling women aged above 60 years: A cross-sectional study.

Evidence has shown that risks of cognitive impairment differ between genders. This cross-sectional study sought to determine the prevalence of mild cognitive impairment (MCI) in Chinese community-dwelling women aged above 60 years and identify risks of MCI by multivariate logistic regression analysis. Totally, 1760 Chinese community-dwelling women entered the study. Cognitive function was assessed with Mini-Mental State Examination (MMSE) and the Montreal Cognitive Assessment (MoCA). MCI was diagnosed by Petersen's criteria. Sociodemographic information, past medical conditions, and age at menopause were screened. The primary study outcome was prevalence of MCI. MCI was diagnosed in 378 (21.5%) women. Older age was a significant risk of MCI (OR 1.621, 95%CI 1.386-1.894; P < 0.001). Low education was associated a 4-fold increase in the risk of MCI (OR 4.036, 95%CI 3.168-5.142). Furthermore, current depression was associated with 2.6-fold increase in the risk of MCI (OR 2.618, 95%CI 1.499-4.587, P = 0.001). Moreover, frequent physical exercise and more leisure and social time activities were associated with significantly reduced risks of MCI, while poor financial status was associated with a significantly increased risk of MCI. Slightly more than 20% of Chinese women aged above 60 years had MCI, and independent risks included older age, low education status, and current depression, highlighting the importance of screening for and removing or minimizing risks of MCI in this specific population.

[Research progress on the epigenetic mechanisms of inverse relationship between Alzheimer's disease and cancer onset].

Alzheimer's disease (AD) is currently the most prevalent neurodegenerative disease in the aging population. It is characterized by massive deposition of extracellular ß-amyloid peptide and formation of intracellular neurofibrillary tangles. Cancer is also an age-related disease. Some epidemiological studies have shown an inverse relationship between AD and the onset of various types of cancers, that is, the risk of cancer in patients with AD is reduced, and vice versa. Epigenetic mechanisms play important roles in the development of AD and cancer. In this article, we will review the recent research advances on the epigenetic mechanisms of AD and cancer onset, and provide new ideas for rethinking the relevance of AD and cancer with a "holistic concept".

Prevalence of insomnia and its risk factors in older individuals: a community-based study in four cities of Hebei Province, China.

OBJECTIVE: To examine the epidemiology of sleep problems and insomnia among the community older individuals in Hebei Province, China, and to investigate the potential sociodemographic and clinical correlates and medication use. METHODS: This cross-sectional study was conducted with community adults, aged 60 years or older, who resided in four major cities in Hebei province. Basic sociodemographic and clinical data were collected and analyzed. A total of 3176 older adults (1292 men, 70.2 ± 6.8 years; 1884 women, 68.8 ± 6.7 years) were interviewed. All of the participants were interviewed with a standardized questionnaire and underwent insomnia screening. RESULTS: The prevalence of insomnia was 37.75%. The most common type of sleep disturbance was difficulty maintaining sleep, followed by difficulty initiating sleep and early morning awakening. Never smoking, experiencing the loss of a parent, a history of coronary heart disease, and depression symptoms were independent risk factors for insomnia in men. Occasional drinking was an independent protective factor against insomnia in men. Older age, depression symptoms, a history of cerebral hemorrhage, hyperlipidemia, living without a spouse, and having mild cognitive impairment were independent risk factors for insomnia in women. Only 11.1% of the sample with insomnia were taking sleeping medications regularly. CONCLUSION: Insomnia is highly prevalent among the community older population in Hebei Province. The percentage of individuals regularly taking sleeping medication is low among those with insomnia. Individuals with complaints of insomnia frequently have poor physical and mental health and may need more medical attention. Comprehensive measures that involve psychosocial and personal behaviors should be implemented to alleviate insomnia in older individuals.

[Clinical effect of the concentrated suture fixation method on skin transplantation in the jaw and neck region].

OBJECTIVE: To observe the clinical effect of the concentrated suture fixation method on skin transplantation on deep burn wound or wound of cicatricial deformity after burn in the jaw and neck region. METHODS: One hundred and fourteen patients, hospitalized from April 2002 to December 2011, with deep burn or cicatricial deformity after burn in the jaw and neck region, were divided into packaging group and concentrated suture group according to the random number table. Each group had 57 patients including 48 cases with deep burn and 9 cases with cicatricial deformity. Traditional suture-package fixation method and concentrated suture fixation method were respectively used in packaging group and concentrated suture group to fix the autologous medium split-thickness skin in transplantation on wounds or scars. On post operation day (POD) 14, the skin microcirculatory perfusion flow of skin graft was measured, and the occurrence of ecchymoma, infection, and necrosis of skin in operative region were observed. The elasticity and contracture of grafted skin and scar hyperplasia on wound edge were observed 6 months after operation. Measurement data were processed with u test, while enumeration data with Fisher's exact test or Chi-square test. RESULTS: (1) On POD 14, the skin microcirculatory perfusion flow in concentrated suture group [(2.86 +/- 0.8) V] was significantly higher than that in packaging group [(2.33 +/- 0.15) V, u = 17.776, P < 0.05]. (2) Ecchymoma occurred in 4 patients of packaging group and 3 patients of concentrated suture group, but the difference between two groups was not statistically significant (chi 2 = 0.152, P > 0.05). (3) Infection in operative region was observed in 1 patient of packaging group, while no patient in concentrated suture group showed this symptom. The difference between two groups was not statistically significant (P > 0.05). (4) Grafted skin in 6 patients of packaging group showed foliated necrosis, which was not observed on those of patients in concentrated suture group. The difference between two groups was statistically significant (P < 0.05). (5) Centipede leg-like scar hyperplasia on wound edge occurred in 21 patients in packaging group and 6 patients in concentrated suture group, and the difference between two groups was statistically significant (chi 2 = 10.920, P < 0.05). (6) Poor elasticity of grafted skin was detected in 17 patients of packaging group and 4 patients of concentrated suture group, and the difference between two groups was statistically significant (chi 2 = 9.865, P < 0.05). (7) Obvious contracture of grafted skin was observed in 15 patients of packaging group and 4 patients of concentrated suture group, and the difference between two groups was statistically significant (chi 2 = 11.684, P < 0.05). CONCLUSIONS: Concentrated suture fixation method is suitable for application in transplantation of big sheet skin on wound in the jaw and neck region. It has high survival rate and is convenient for postoperative observation.

[Influence of high-voltage electrical burn on the rheological property of platelet and leukocyte in rats and the interventional effect of pentoxifylline].

OBJECTIVE: To investigate the influence of high-voltage electrical burn (HEB) on the aggregation and adhesion of platelet and leukocyte in rats and the interventional effect of pentoxifylline (PTX). METHODS: One hundred and eighty SD rats were divided into control, electrical burn (EB), and pentoxifylline treatment (PT) groups according to the random number table, with 60 rats in each group. (1) Ten rats were taken from each group at 15 minutes before injury for the observation of the microcirculatory perfusion of chest skin with Laser Doppler Perfusion Imager (LDPI), and the number of leukocyte adherent to mesenteric venule with Bradford Variable Projection Microscope (BVPM). Serum was collected from heart blood to determine the contents of platelet activating factor (PAF), thromboxane B2 (TXB2), prostacyclin (PGI2), P-selectin, E-selectin and L-selectin by double-antibody sandwich enzyme-linked immunosorbent assay. The ratio of TXB2 to PGI2 was calculated therefrom. (2) Model of HEB was reproduced in the remaining 50 rats of EB group and that of PT group with voltage regulator and experimental transformer (the electrical current applied to the left forelimb and exited from the right hind limb). The remaining 50 rats of control group were sham injured with the same devices without electric current. Within 2 minutes post injury (PIM), rats in control group and EB group were intraperitoneally injected with 2 mL isotonic saline, while rats in PT group were intraperitoneally injected with 2 mL pentoxifylline (50 mg/mL). At PIM 5 and 1, 2, 4, 8 hour(s) post injury (PIH), 10 rats of every group were randomly chosen at each time point for the observation of the microcirculatory perfusion of chest skin and the number of leukocytes adherent to mesenteric venule through the same method as used above, and the levels of the related factors of aggregation and adhesion of platelets and leukocytes were determined, and then the relative ratio was calculated. Data were processed with the analysis of variance of factorial design and LSD test. RESULTS: The contents of PAF, TXB2, PGI2, P-selectin, E-selectin, L-selectin, and the ratio of TXB2 to PGI2, as well as the number of adhered leukocyte in EB group were higher, while the microcirculatory perfusion value was lower than those of control group, with F values from 854.20 to 8156.52, P values all below 0.01. The microcirculatory perfusion value and PGI2 content of PT group were higher, while the contents or number of other indexes were lower than those of EB group, with F values from 33.18 to 1033.99, P values all below 0.01. Only the data within EB group and PT group were comparable. The contents of PAF, TXB2, PGI2, P-selectin, E-selectin, L-selectin, and the ratio of TXB2 to PGI2, as well as the number of adhered leukocyte in EB group and PT group at each time point were significantly higher than those at 15 minutes before injury, while the microcirculation perfusion value was significantly lower than that at 15 minutes before injury (P values all below 0.001), with the exception of the ratio of TXB2 to PGI2 in PT group and E-selectin in EB group and PT group at PIM 5. The contents of PAF, TXB2, and E-selectin and the ratio of TXB2 to PGI2 in EB group peaked at PIH 4, and they were respectively (9.3 ± 0.9) ng/mL, (14.31 ± 0.65) nmol/mL, (271.2 ± 18.4) ng/mL and 4.62 ± 0.26. The contents of PGI2 and P-selectin, and the number of adhered leukocyte in EB group peaked at PIH 8, and they were respectively (3.98 ± 0.24) nmol/mL, (514 ± 24) ng/mL, and (25.50 ± 4.14) per 100 µm venule. The content of L-selectin peaked at PIH 2 [(876 ± 54) ng/mL]. The microcirculatory perfusion value was lowest at PIM 5 [(1.17 ± 0.10) V]. CONCLUSIONS: HEB can increase the contents of PAF, TXB2, PGI2, P-selectin, E-selectin, L-selectin, the ratio of TXB2 to PGI2, and the number of adhered leukocyte, as well as decrease the skin microcirculatory perfusion value. PTX can inhibit the aggregation and adhesion of platelets and leukocytes through increasing the content of PGI2 and decreasing contents of other factors mentioned above, thus alleviating the microcirculatory dysfunction after HEB.

Effect of cholecystokinin octapeptide on diacylglycerol-PKC signaling pathway in rat pulmonary interstitial macrophages stimulated by lipopolysaccharide.

AIM: To investigate the effect of cholecystokinin octapeptide (CCK-8) on the diacylglycerol-protein kinase C (DAG-PKC) signaling pathway in rat pulmonary interstitial macrophages (PIM) stimulated by lipopolysaccaride (LPS). METHODS: The PIM from rat lung tissues were isolated using the collagenase digestion method combined with alveolar lavage and pulmonary vessel perfusion. DAG content and PKC activity were measured by radioenzymatic assay. The translocation of PKCzeta was determined by semi-quantitative immunoblot analysis. RESULTS: CCK-8, at high concentrations (1 x 10(-6) - 1 x 10(-5) mol/L), decreased DAG content and inhibited PKC activity and PKCzeta translocation compared with that in rat resting PIM of a control group (P< 0.01). LPS increased DAG content, and promoted PKC activity and PKCzeta translocation (P< 0.01). CCK-8 decreased LPS-induced DAG content and inhibited LPS-induced PKC activity and PKCzeta translocation significantly at 1 x 10(-8) - 1 x 10(-5) mol/L (P< 0.01). This inhibitory effect of CCK-8 could be abrogated partly by proglumide (non-selective CCK receptor antagonist), CR-1409 (selective CCK-A receptor antagonist), and CR-2945 (selective CCK-B receptor antagonist) in a concentration-dependent manner (P< 0.01). CONCLUSION: CCK-8 was a negative modulator of the DAG-PKC signaling pathway in rat resting PIM, which is very important for maintaining body homeostasis. It significantly inhibited LPS-induced DAG content, PKC activity and PKCzeta translocation in a concentration-dependent manner. The CCK receptor, especially the CCK-A receptor, might play a major role in this process.

[Activation mechanisms of protein kinase Czeta and its cellular function].

The zeta isotype of protein kinase C (PKCzeta) is a member of the atypical PKC subfamily and has been widely implicated in the regulation of cellular functions. PKCzeta, as an important message molecular, is involved in many intracellular signaling pathways, such as the mitogen-avtivated protein kinase (MAPK) cascade, transcriptional factor NF-kappaB activation, ribosomal S6-protein kinase signaling and so on. Increasing evidence from studies support the concept that the activation mechanisms of PKCzeta are tissue/cell specific. The understanding of the mechanisms underlying PKCzeta-mediated control of intracellular signaling is beginning to provide important insightsinto the roles of PKCzeta in various cells.

Effect of lipopolysaccharide on expression and characterization of cholecystokinin receptors in rat pulmonary interstitial macrophages.

AIM: To investigate the effect of lipopolysaccharide (LPS) on the expression and the binding characteristics of cholecystokinin receptors (CCK-R) in rat pulmonary interstitial macrophages (PIMs). METHODS: The PIMs isolated from rat lung tissues were purified by the collagenase digestion method combined with alveolar lavage and pulmonary vessel perfusion. The expression of CCK-R mRNA was detected by RT-PCR and Southern blot analysis and the binding experiments were performed by radioligand binding assay (RBA). RESULTS: CCK-A receptor (CCK-AR) and CCK-B receptor (CCK-BR) mRNA were detected in rat PIMs and their RT-PCR amplified products had a size of approximately 1.37 kb and 480 bp, respectively. The relative expression of CCK-BR mRNA was higher than that of CCK-AR mRNA after incubation with LPS for 0.5, 2, and 6 h. The expression of CCK-R mRNA could be upregulated obviously by LPS. Southern blot analysis of RT-PCR amplified CCK-AR and CCK-BR mRNA products using [gamma-32P]ATP 5'-end-labelled probe showed specific hybridization bands. The specific binding of [3H]CCK-8S to rat PIM membranes was detected in the rats administered with LPS for 48 h, but not in normal rats. Scatchard analysis of the saturation curves suggested the presence of CCK-R with a high affinity (Kd = 0.68 +/- 0.28 nmol/L) and a low binding capacity (Bmax = 32.5 +/- 2.7 fmol/g protein) in rat PIMs. The specific binding of [3H]CCK-8S to rat PIM membranes was inhibited by unlabelled CCK-8S (IC50 = 2.3 +/- 0.8 nmol/L), CCK-AR specific antagonist CR1409 (IC50 = 0.19 +/- 0.06 micromol/L) and CCK-BR specific antagonist CR2945 (IC50 = 3.2 +/- 0.1 nmol/L). CONCLUSION: Two types of functional CCK-AR and CCK-BR existed in rat PIMs and their expression could be upregulated by LPS.

[Specific anti-tumor effect of immune competent cell induced by HSP-70 of HeLa cells in vitro].

BACKGROUND & OBJECTIVE: Recent studies indicated that heat shock proteins (HSPs) are associated with antigenic peptides and participate in the antitumor T cell response in animals. This study was designed to investigate the mechanism of anti-tumor effect of immune competent cells (ICC) induced by HSP-70 of HeLa (cervical carcinoma) cells in vitro. METHODS: The normal peripheral blood mononuclear cells(PBMCs) stimulated with HSP-70 of HeLa cells in vitro. T cell phenotypes were analyzed before and after stimulated by PBMCs. HSP-70 primed the immune competent cells (ICCs) from PBMCs were tested for cytotoxic activity against HeLa cell. RESULTS: CD3+ cell was 85.73 +/- 1.44%, up from 57.68 +/- 1.46% before the amplification(P < 0.002). CD8+ cell was 48.06 +/- 1.66%, up from 23.56 +/- 1.86% before the amplification(P < 0.002). The ICCs induced by HSP-70 were shown significant cytotoxic activity (82.69 +/- 1.97%, 62.11 +/- 1.61%) against HeLa cells and cervical carcinoma cells, and the cytotoxic activity (31.05 +/- 2.09%) of the ICC against HeLa cells could be blocked by anti-HSP-70 antibody. CONCLUSION: The ICC can be induced selectively by PBMCs with HSP-70 of HeLa cells, and has specific cytotoxic activity against HeLa cell.