[Effect of High-Concentration Uric Acid on Nitric Oxide].

Uric acid (UA) is the final product of purine metabolism in human body,and its metabolic disorder will induce hyperuricemia (HUA).The occurrence and development of HUA are associated with a variety of pathological mechanisms such as oxidative stress injury,activation of inflammatory cytokines,and activation of renin-angiotensin-aldosterone system.These mechanisms directly or indirectly affect the bioavailability of endogenous nitric oxide (NO).The decrease in NO bioavailability is common in the diseases with high concentration of UA as an independent risk factor.In this review,we summarize the mechanisms by which high concentrations of UA affect the endogenous NO bioavailability,with a focus on the mechanisms of high-concentration UA in decreasing the synthesis and/or increasing the consumption of NO.This review aims to provide references for alleviating the multisystem symptoms and improving the prognosis of HUA,and lay a theoretical foundation for in-depth study of the correlations between HUA and other metabolic diseases.

[Expressions of HO-2 and CO in the corpus cavernosum of castrated rats].

OBJECTIVE: To explore the expressions of HO-2 and CO in the corpus cavernosum of castrated rats in order to further study the pathogenesis of erectile dysfunction (ED). METHODS: We randomly divided 72 male SD rats into four groups: normal control, sham operation, castration, and castration + ZnPP. We detected intracavernous pressure (ICP) and penile erection in the basic condition and after apomorphine (APO) induction, determined the expression of the HO-2 protein in the corpus cavernosum by laser scanning confocal microscopy, and measured the level of CO by spectrophotometry during different periods of penile erection. RESULTS: The ICP in the basic condition and that after APO induction and the rate of penile erection were decreased significantly in the castration group ([11.68 ± 0.69] mmHg, [54.81 ± 3.86] mmHg, and 33.3%) and the castration + ZnPP group ([11.20 ± 0.71] mmHg, [41.17 ± 5.41] mmHg, and 22.2%) as compared with the normal control ([22.83 ± 2.66] mmHg, [66.92 ± 7.77] mm-Hg, and 100%) and the sham operation group ([23.35 ±2.22] mmHg, [70.43 ?7. 22] mmHg, and 100%) (all P <0. 01). After APO induction, ICP in the castration + ZnPP group was remarkably reduced in comparison with that in the castration group (P < 0.01), and so was the expression of the HO-2 protein before and during penile erection in the castration (445.4 ± 23.7 and 847.4 ± 35.0) and the castration + ZnPP group (390.1 ± 29.7 and 526.0 ± 52.5) compared with the normal control (512.7 ±57.4 and 1145.2 ± 89.8) and the sham operation group (583.7 ± 8.0 and 1016.3 ± 79.8), the expression of the HO-2 protein significantly decreased in the castration group (445.4 ± 23.7 and 847.4 ± 35.0) (P < 0.05 or 0.01), markedly lower in the castration + ZnPP than in the castration group during penile erection (P < 0.01) but with no significant differences among the four groups after it. Before, during and after penile erection, the levels of CO were remarkably decreased in the castration ([20.59 ± 1.01], [32.53 ± 1.26], and [18.71 ± 1.22] x 10(-7) nmol/L) and the castration +ZnPP group ([12.52 ± 1.05], [21.90 ± 1.02], and [16.56 ± 0.55] x 10(-7) nmol/L) as compared with the normal control ([26.76 ± 1.41], [48.25 ± 1.01], and [27.10 ± 1.58 ] x 10(-7) nmol/L) and the sham operation group ([25.41 ± 2.09], [ 47.90 ± 1.22], and [25.67 ± 1.20] x 10(-7) nmol/L) (P < 0.05 or 0.01), significantly lower in the castration + ZnPP than in the castration group during penile erection (P < 0.01). CONCLUSION: Decreased expressions of HO-2 and CO may correlate with erectile dysfunction in castrated rats.

Low-level expression of purine bases in BALB/3T3 cells monitored by ultrasensitive graphene-based glass carbon electrode.

Using an ultrasensitive chemically reduced graphene oxide and ionic liquid modified glass carbon electrode (RGI-GCE), separated electrochemical signals of adenine and hypoxanthine in both human breast cancer (MCF-7) and mouse embryonic fibroblast (BALB/3T3) cells were observed. For the first time, low-level expression of purine bases in noncancerous BALB/3T3 cells can be electrochemically monitored. The metabolism of purine bases in carcinogen agent-contaminated BALB/3T3 cells was also investigated through the change of electrochemical signals ascribed to different purine bases, which opens a new electrochemical approach to the exploration of a low-level purine mechanism in noncancerous cells.

Association Between Vitamin D and Hyperuricemia Among Adults in the United States.

Background: Serum uric acid can act as a risk factor for cardiovascular disease (CVD) and as antioxidant defense. Vitamin D deficiency can activate the parathyroid to induce the release of parathyroid hormone, which was thought to increase serum uric acid level, and low vitamin D status may also be associated with risk of CVD. No known studies have explored the association between serum 25(OH) D, vitamin D intake, and HU for the American population. Methods: We extracted 15,723 US adults aged 20-85 years from the National Health and Nutrition Examination Survey (NHANES) in 2007-2014. All dietary intakes were evaluated through 24-h dietary recalls. Multivariable logistic regression analysis was performed to examine the associations after adjustment for confounders. Results: Compared to the lowest quintile (Q1), for males, adjusted odds ratios (ORs) of HU in Q2 to Q4 of serum 25(OH) D levels were 0.78 (95% CI, 0.65-0.93), 0.97 (0.81-1.16), and 0.72 (0.60-0.88); ORs in Q2-Q5 of total vitamin D intake were 0.83 (0.69-0.98), 0.69 (0.58-0.83), 0.66 (0.55-0.79), and 0.59 (0.48-0.71), respectively. In females, OR was 0.80 (0.66-0.97) of serum 25(OH) D for Q3, and ORs in Q5 of total vitamin D intake were 0.80 (0.65-0.98). Conclusions: Our findings indicated that the serum 25(OH) D intakes of dietary vitamin D, supplemental vitamin D, and total vitamin D were inversely associated with HU in males. In females, a lower risk of HU with higher serum 25(OH) D, dietary vitamin D, and total vitamin D intake was found, but with no association between supplemental vitamin D intake and the risk of HU.

Luteolin Protects Pheochromocytoma (PC-12) Cells against Aß 25-35-Induced Cell Apoptosis through the ER/ERK/MAPK Signalling Pathway.

The regulatory effect of luteolin on the progression of Alzheimer's disease (AD) remains unclear from the perspective of apoptosis. The present study aimed to investigate the protective effects of luteolin against Aß 25-35-induced cell apoptosis in pheochromocytoma (PC-12) cells. Aß 25-35 was used to induce an in vitro model of AD. Estradiol was used as a positive control. The PC-12 cells were incubated with luteolin alone or in combination with fulvestrant or U0126. The results showed that luteolin treatment significantly prevents Aß 25-35-induced decrease in cell viability and inhibits Aß 25-35-induced cell apoptosis. After the addition of fulvestrant and U0126, the apoptosis rate of PC-12 cells increased significantly. In addition, luteolin treatment significantly upregulated the expression of Bcl-2 and downregulated the expression of Bax and caspase-3, whereas fulvestrant and U0126 partially reversed the effects of luteolin. Moreover, luteolin treatment upregulated the expression of ERß and p-ERK1/2, whereas fulvestrant blocked the expression of p-ERK1/2. The study showed that luteolin could activate the ER/ERK/MAPK signalling pathway to protect PC-12 cells against Aß 25-35-induced cell apoptosis via selectively acting on ERß. Thus, luteolin may be considered as a potential novel therapeutic strategy for AD.

Anti-epileptic effect of Ganoderma lucidum polysaccharides by inhibition of intracellular calcium accumulation and stimulation of expression of CaMKII α in epileptic hippocampal neurons.

PURPOSE: To investigate the mechanism of the anti-epileptic effect of Ganoderma lucidum polysaccharides (GLP), the changes of intracellular calcium and CaMK II α expression in a model of epileptic neurons were investigated. METHOD: Primary hippocampal neurons were divided into: 1) Control group, neurons were cultured with Neurobasal medium, for 3 hours; 2) Model group I: neurons were incubated with Mg(2+) free medium for 3 hours; 3) Model group II: neurons were incubated with Mg(2+) free medium for 3 hours then cultured with the normal medium for a further 3 hours; 4) GLP group I: neurons were incubated with Mg(2+) free medium containing GLP (0.375 mg/ml) for 3 hours; 5) GLP group II: neurons were incubated with Mg(2+) free medium for 3 hours then cultured with a normal culture medium containing GLP for a further 3 hours. The CaMK II α protein expression was assessed by Western-blot. Ca(2+) turnover in neurons was assessed using Fluo-3/AM which was added into the replacement medium and Ca(2+) turnover was observed under a laser scanning confocal microscope. RESULTS: The CaMK II α expression in the model groups was less than in the control groups, however, in the GLP groups, it was higher than that observed in the model group. Ca(2+) fluorescence intensity in GLP group I was significantly lower than that in model group I after 30 seconds, while in GLP group II, it was reduced significantly compared to model group II after 5 minutes. CONCLUSION: GLP may inhibit calcium overload and promote CaMK II α expression to protect epileptic neurons.

[Risk factors related to infantile spastic cerebral palsy among 145 cases].

OBJECTIVE: To study the risk factors related to spastic type of cerebral palsy through a screening program. METHODS: With a 1:2 matched case-control study design, 145 cases were selected from the Cerebral Palsy Treatment and Management Center in Heilongjiang Province from Dec., 2007 through May 2009. Another 290 cases of children as control group were chosen from the First Affiliated Hospital of Jiamusi University, in the same period. Controls were excluded the central nervous system diseases, matching with cases at the age differences no more than 3 months, with same sex and ethnicity. Questionnaire survey was used to access relevant information, while logistic regression analysis was used to screen the risk factors. RESULTS: Data from Single factor logistic regression analysis notified 39 items as statistically significant factors. Through multivariate logistic regression analysis, 11 factors in all the cerebral palsy cases, and incidence of cerebral palsy risk factors related to low or high birth weight were discovered as follows: mother with college degree, newborns with high muscle tone, skin color as purple, taking antipyretic analgesics drugs during pregnancy, experience significant events during pregnancy, situation of environment pollution around the house, having intracranial hemorrhage and birth asphyxia, fetal distress during pregnancy or neonatal stage etc. CONCLUSION: Pre/Neonatal factors were closely related to cerebral palsy, suggesting that health care knowledge be popularized and related management be strengthened, to reduce the cerebral palsy incidence in the newborns.