[A novel mouse allergy tested model and its application for traditional Chinese medicine injections's allergy evaluation].

When the drug induces the organism to produce a type Ⅰ allergic reaction, the combination of IgE and mast cells results in the degranulation of the mast cells. Release of vasoactive substances, increase in vascular permeability, and exudation of intravascular substances outside the blood vessels. Based on this pathophysiological mechanism, a mouse model that can objectively and quantitatively assess the allergic response to the injection has been established. ICR mice were sensitised by intraperitoneal injection of different doses of OVA once every two days for three times. 14 days after the last sensitization, a combination OVA solution of 4 times the sensitizing dose and Evans blue were injected intravenously into mice for the challenge. Compared with the normal group, OVA 0.625/2.5, 1.25/5, 2.5/10, 5/20 mg·kg~(-1) sensitized and challenged can induce allergic reactions mainly manifested by blue staining of the auricle in mice. Direct injection of OVA intravenously did not cause an auricular blue colouration reaction in mice. The passive cutaneous anaphylaxis reaction in mice was conducted with the aforementioned OVA-sensitized mouse serum, and there were obvious blue spots on the mouse's back. In addition, the content of anti-OVA-IgE in 5 mg·kg~(-1) OVA-sensitized mice was significantly increased. Ears and lungs of mice sensitized to OVA showed evident exudation inflammation. Significantly elevated inflammatory factors(VEGF and IL-10) were also detected in the serum of OVA-sensitized mice. The equivalent dose of OVA caused obvious allergic reactions in both guinea pigs and mice. Compared with nude mice, ICR and BALB/c mice are more sensitive to OVA sensitization. Injections of selected TCMI did not induce type Ⅰ allergic reactions in mice and guinea pigs, but there was a risk of inducing pseu-doallergic reactions in mice. The model is problematic and may well reflect the sensitization effect of allergens. It obtains the benefits of simple operation, accuracy, low cost, easy extension, and high repeatability. It is suitable for predicting and researching for IgE-dependent type Ⅰ allergic reactions.

[Risk assessment, safe medication and scientific supervision of traditional Chinese medicine containing aristolochic acids--toxicity is different among aristolochic acids, and detection and control of aristolochic acid â /â ¡ is critical].

The safety problem of traditional Chinese medicine containing aristolochic acid is of great concern in China and abraod, which poses a challenge in clinical application and supervision. There are many types of aristolochic acid analogues(AAAs) and 178 have been reported. According to the structure, they are classified into aristolochic acids(AAs) and aristololactams(ALs). The toxi-city is remarkably different among AAAs of different types. For example, AA-Ⅰ has strong nephrotoxicity and carcinogenicity, and the toxicity of AA-Ⅱ is lower than that of AA-Ⅰ. Besides, AA-Ⅳa and AA-Ⅰa are considered to have no obvious nephrotoxicity and carcinogenicity. The types and content of AAAs are significantly different among traditional Chinese medicines derived from different Aristolochiaceae species. For example, Asari Radix et Rhizoma and Aristolochiae Herba mainly consist of AAAs without obvious toxicity(such as AA-Ⅳa). The content of AAAs in compound preparations is related to the proportions of the medicinals and the processing method. The content of AA-Ⅰ in some compound preparations is very low or below the detection limit. Therefore, the author concludes that AAAs of different types have different toxicity, but not all AAAs has nephrotoxicity and carcinogenicity. Moreover, the toxicity of traditional Chinese medicines containing AAAs should not be generalized and AA-Ⅰ and AA-Ⅱ should be emphasized. In this paper, it is suggested that traditional Chinese medicine containing AAAs should be used rationally and research, analysis, and toxicological study of AAAs species and content should be strengthened. In addition, limit standards of AA-Ⅰ and AA-Ⅱ should be formulated and science-based supervision should be performed.

The Involvement of the RhoA/ROCK Signaling Pathway in Hypersensitivity Reactions Induced by Paclitaxel Injection.

A high incidence of hypersensitivity reactions (HSRs) largely limits the use of paclitaxel injection. Currently, these reactions are considered to be mediated by histamine release and complement activation. However, the evidence is insufficient and the molecular mechanism involved in paclitaxel injection-induced HSRs is still incompletely understood. In this study, a mice model mimicking vascular hyperpermeability was applied. The vascular leakage induced merely by excipients (polyoxyl 35 castor oil) was equivalent to the reactions evoked by paclitaxel injection under the same conditions. Treatment with paclitaxel injection could cause rapid histamine release. The vascular exudation was dramatically inhibited by pretreatment with a histamine antagonist. No significant change in paclitaxel injection-induced HSRs was observed in complement-deficient and complement-depleted mice. The RhoA/ROCK signaling pathway was activated by paclitaxel injection. Moreover, the ROCK inhibitor showed a protective effect on vascular leakage in the ears and on inflammation in the lungs. In conclusion, this study provided a suitable mice model for investigating the HSRs characterized by vascular hyperpermeability and confirmed the main sensitization of excipients in paclitaxel injection. Histamine release and RhoA/ROCK pathway activation, rather than complement activation, played an important role in paclitaxel injection-induced HSRs. Furthermore, the ROCK inhibitor may provide a potential preventive approach for paclitaxel injection side effects.

[Preclinical study on adverse reactions of Xingnaojing injection].

In this study, different batches of Xingnaojing injection products were first selected for pseudoallergic mice test, and the results showed that after injection of 6.6-fold clinical dose Xingnaojing injection, the mice showed a slight pseudoallergic reaction, while other mice injected with other batches of injections showed no obvious pseudoallergic reaction. Therefore, it is preliminarily believed that this mice model can effectively indicate the risk of pseudoallergic reactions in the clinical application of Xingnaojing injections. In addition, by changing some of the processes, a high concentration of Xingnaojing injection was prepared for mice pseudoallergic test and guinea pig systemic allergy test. The results showed no significant type Ⅰ allergic reaction in guinea pigs. Mild pseudoallergic reactions occurred in mice after a 6.6-fold clinical dose injection. Therefore, it is considered that for sensitive or idiosyncratic people, the concentration of certain chemical components in Xingnaojing injection will increase after entering the body, which may increase the risk of pseudoallergic reaction. However, due to the limitations of test models, the risk of Xingnaojing injection to induce allergic reactions cannot be ruled out. Finally, by increasing the content of borneol and Tween and (or) sodium chloride in Xingnnaojing Injection and testing its pseudoallergic reactions, the results showed that the combination of these three ingredients may produce new trace sensitization substance and induce pseudoallergic reactions.

[Mechanism of nephrotoxicity of rhubarb in rats].

The aim of this study was to investigate the renal toxicity of rhubarb and its mechanism. The SD rats were randomly divided into three groups: normal group and two rhubarb extract groups (16, 2 g·kg⁻¹). According to the dose conversion method between human and animal, rhubarb 16 g·kg⁻¹ and 2 g·kg⁻¹ were equivalent to 10 times and 1.25 times of human clinical dose respectively. Rhubarb extract was administered by a gastric gavage to rats once daily for 30 days. Serum urea nitrogen （BUN）, creatinine （CRE） and urine KIM-1, NGAL and renal morphology were analyzed. The expressions of OAT1, OAT3 and clusterin mRNA in kidney were measured. The results showed that the low dose of rhubarb had no obvious renal toxicity. The high dose group showed mild and moderate renal injury and a down-regulation of clusterin mRNA expression in the kidney tissue. The renal toxicity in male animals was heavier than that in female animals. There was no significant change in blood BUN and CRE in the high dose group. But urine NGAL level of the high dose group increased by 51.53% compared with normal group, of which male animals increased more significantly (P<0.05, compared with the normal group). The expressions of renal OAT1 and OAT3 mRNA in the low dose group were obviously higher than that in the normal group. The results indicated that the high dose of rhubarb could cause the renal toxicity. The dosage should be controlled reasonably in the clinical use. OAT1 and OAT3 mRNA related to anionic transport in kidney tissue played a compensatory protective role in rhubarb-induced renal injury. But the compensatory effect is relatively weak at the high dose level. In addition, routine renal function indicators BUN and CRE had limitation for monitoring the kidney toxicity of rhubarb. It is suggested that urine NGAL detection might be helpful for monitoring the renal toxicity of rhubarb.

[Pseudoallergic reaction characteristics of Qingkailing injection and preliminary screening of allergic substances].

This study aimed to explore the characteristics and the influencing factors of Qingkailing injection (QKLI) pseudoallergic reaction, and screen out the possible pseudoallergenic substances. The results showed that ICR and Kunming mice had stronger pseudoallergic reactions than BALB/c and C57 mice after being injected with the same dose of QKLI. The pseudoallergic reaction induced by QKLI that was prepared with 0.9% saline was stronger than that prepared with 5% glucose. When the dose was twice of the clinical dose, some batches of QKLI could cause significant or suspected pseudoallergic reactions; when the dose dropped to clinically equal times, all of the batches did not induce pseudoallergic reactions in mice. Different batches of QKLI induced different pseudoallergic reactions in mice. Therefore, QKLI's pseudoallergic reactions might have a certain relationship with different body constitutions. Different solvents might affect the safety of QKLI. QKIL-induced pseudoallergic reactions had the different characteristics between batches, and the dosage should be strictly controlled in clinical use. After the comparison of pseudoallergic reactions induced by different components and different intermediates of QKLI in mice, it was preliminary believed that pseudoallergenic substances might exist in intermediate Isatidis Radix extracts and Gardenia extracts, but specific pseudoallergens shall be furthered studied in subsequent experiences.

[Pharmacokinetic characteristics of fourteen main components of Gegen Qinlian Decoction in rats].

Animal traditional Chinese medicine has a long history of application in China, and its clinical application is very extensive. Due to the complex chemical composition in animal traditional Chinese medicine, the basis of chemical research is relatively weak, which leads to the unclear composition and toxic components of many animal Chinese medicines. The relationship between the medicinal and toxic components of animal Chinese medicine has not yet been elucidated. The non-clinical safety evaluation of animal traditional Chinese medicine mainly includes acute toxicity, long-term toxicity, safety pharmacology, reproductive toxicity, genotoxicity experiments, and experimental studies such as carcinogenicity are needed when necessary. The current preclinical safety research on animal traditional Chinese medicine is mainly based on the study for toxic animal traditional Chinese medicines. Most animal Chinese medicines have not carried out systematic preclinical and clinical safety studies. The research method is mainly focused on acute toxicity test. It is necessary to carry out systematic preclinical safety studies on animal traditional Chinese medicines, to clarify the possible side effects and its characteristics, its toxic target organs, toxic doses and poisoning mechanisms induced by different animal traditional Chinese medicines. Finally, this paper suggests that in the preclinical safety study of animal traditional Chinese medicine, in-depth research and comparison should be carried out in combination with chemical substance foundation, origin, and collection season, and the safety of "non-toxic" animal traditional Chinese medicine should be carried out when necessary. In addition, it is necessary to rationally use the cutting-edge technologies and methods of toxicology research to fully clarify the preclinical safety information of animal Chinese medicines.

[Adverse reaction and screening of sensitizing substance of Shuxuening injection].

In this study, by the means of the active systemic allergy test in guinea pigs, passive skin allergy test in rats and pseudoallergic test in mice, it was determined that the "allergic reaction" of Shuxuening injection(SXNI) may not be a true IgE-mediated allergic reactions, but mainly of pseudoallergic reaction. Further pseudoallergic test proved that the pseudoallergic reactions of SXNI had difference between batches and showed dose dependence, so it was recommended to establish SXNI pseudoallergic reaction detection method for timely detecting and controlling the product risk of each batch products. In addition, as the pseudoallergic reactions of SXNI were dose-dependent, the dose and concentration of SXNI should be strictly controlled in clinical use. Then the main pseudoallergenic reaction test was conducted for the main monomer components in SXNI and the different fractions of Ginkgo biloba extract in mice, and the results showed that the sensitizing substances may mainly exist in YXY-3 fractions containing flavonol glycosides. By further chemically separating YXY-3, we got four chemical components. Among these four components, YXY-3-1 and YXY-3-2 were testified as the main allergenic components in SXNI through pseudoallergic test in mice. To make sure the specific chemical constituent that is responsible for the pseudoallergic reaction, in-depth study in follow-up experiments should be needed.

Effect of a Health Belief Model-based nursing intervention on Chinese patients with moderate to severe chronic obstructive pulmonary disease: a randomised controlled trial.

AIMS AND OBJECTIVES: To test the effect of a Health Belief Model-based nursing intervention on healthcare outcomes in Chinese patients with moderate to severe COPD. BACKGROUND: The Health Belief Model (HBM) has been internationally validated in a variety of chronic conditions. However, nursing intervention based on the HBM is less explored in Chinese patients with COPD. DESIGN: A randomised controlled trial. METHODS: Enrolled patients were randomly assigned to the intervention and control groups. Patients in the intervention group received a 20- to 30-minute HBM-based nursing intervention every 2 days during the hospitalisation period after disease conditions were stable, with additional follow-ups after discharge. Patients in the control group received routine nursing care. RESULTS: Patients had significantly increased scores of health belief and self-efficacy after receiving the HBM-based nursing intervention. After receiving the 3-month follow-up, patients in the intervention group had significantly higher mean total scores in the Health Belief Scale and the COPD Self-Efficacy Scale, as well as in all the subscales, than those in the control group except the perceived disease seriousness. Results showed that the value of FEV1 /FVC ratio had a significant difference between study groups before and after the intervention. Results also indicated that mean scores of the Dyspnea Scale, 6-minute walking distance and ADL were significantly different between the groups and between the study time-points. CONCLUSIONS: Among patients with moderate to severe COPD, nursing intervention based on the HBM can enhance their health belief and self-efficacy towards the disease management, decrease dyspnoea and improve exercise tolerance and ADL. RELEVANCE TO CLINICAL PRACTICE: Nurses can use the HBM-based intervention to enhance patients' health belief and self-efficacy towards the management of COPD, and subsequently benefit healthcare outcomes.

Study on factors influencing recrudescent time of postdischarge patients with chronic obstructive pulmonary disease.

AIM: (1) To explore the prognostic factors of patients with chronic obstructive pulmonary disease. (2) To calculate the recrudescence time (the time from discharge to acute exacerbation again) of postdischarge patients with chronic obstructive pulmonary disease. BACKGROUND: Chronic obstructive pulmonary disease is an airflow limitation illness that is preventable and treatable. To find out the prognostic factors will make effective postdischarge care, which can help patients reduce readmission times and prolong recrudescent time. DESIGN: Cohort study. METHOD: From November 2007-October 2008, 136 patients with acute exacerbation of chronic obstructive pulmonary disease were analysed by gender, age, career, education level, body mass index, smoking, oxygen therapy, drug-taken compliance, respiratory function exercise, blood gas, lung function, six-minute walking test and degree of dyspnoea. Factors related to prognosis were analysed by univariate and multivariate Cox regression. Kaplan-Meier method was used for survival analysis and log-rank test for comparison of survival curve. RESULTS: A total of 121 patients recrudesced up to October 2009. Recrudescence rate was 7·35% in a month, 25·00% in three months, 55·62% in six months and 88·23% in 12 months. Higher drug-taken compliance and respiratory function exercise were the factors influencing patients' acute exacerbation (p < 0·05). The median recrudescence time of drug taken or not was six and four months, and doing respiratory function exercise or not was eight and six months. CONCLUSION: Respiratory function exercise and higher drug-taken compliance can prolong recrudescence time and reduce recrudescence rate. RELEVANCE TO CLINICAL PRACTICE: Clinical nurses who know more risk factors about acute exacerbation of patients with chronic obstructive pulmonary disease can provide effective discharge planning, which will increase patients' quality of life and decrease mortality.

Parathyroid hormone(1-34)-induced apoptosis in neuronal rat PC12 cells: implications for neurotoxicity.

Based on accumulated evidence, we speculate that a high concentration of parathyroid hormone (PTH) may cause neurotoxicity in patients with uremia through apoptosis-induced neuropathy. In this study, we demonstrated that in vitro stimulation with PTH(1-34) induced a significant decrease in PC12 cell numbers in both dosage- and time-dependent fashions when these cells were treated with PTH(1-34) at concentrations of 0.01, 0.1 or 1.0 µM for 24, 48, 72, and 96 h, respectively, as assessed by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method. Decreased numbers of PC12 cells were caused by PTH(1-34)-induced apoptotic and cytotoxic processes, as determined by DNA fragmentation, flow cytometry, and lactate dehydrogenase (LDH)-leakage assays. Upregulation of the extracellular signal-regulated kinase (ERK) and p38 signaling pathway was the underlying mechanism responsible for 1.0 µM PTH(1-34)-induced apoptosis in PC12 cells, as elucidated by Western blotting analysis and confirmed with ERK and p38 inhibitors. Furthermore, 1.0 µM PTH(1-34)-induced apoptosis was accompanied by a release of cytochrome c and subsequent caspase-3 activation. These data suggest that a high concentration of PTH(1-34)-induced cytotoxicity and apoptosis in PC12 cells was associated with upregulation of ERK and p38 through a mitochondria-mediated apoptotic pathway.

[Parathyroid hormone 1-34 induce cardiac myocytes hypertrophy via extracellular regulated protein kinase 1/2 pathway].

OBJECTIVE: To investigate the role of mitogen activated protein kinase kinase 1 (MAPKK, MEK1) and regulated kinase1/2 (ERK1/2) on cardiac hypertrophy induced by rat parathyroid hormone1-34 (rPTH1-34). METHOD: Neonatal rat cardiomyocytes was treated with or without 10(-7) mol/L rPTH1-34 in the absence or presence 2 x 10(-5) mol/L PD98059, a MEK1 inhibitor. Cellular diameter was measured by Motic Images Advanced 3.0 software and the synthetic rate of protein in cardiac myocytes was detected by 3H-leucine incorporation, mRNA expression of atrial natriuretic peptide (ANP) was measured by RT-PCR and protein expression of ERK1/2 and p-ERK1/2 was measured by Western blot. RESULTS: rPTH1-34 (10(-7) mol/L) significantly increase cellular diameter (+13.6 microm), 3H-leucine incorporation (+898 cpm/well), ANP mRNA expression (+73.9%), and p-ERK1/2 protein expression (+15%) compared to control cells (all P < 0.05) and these effects could be significantly attenuated by PD98059: cellular diameter (-7.1 microm), 3H-leucin e incorporation (-644 cpm/well), ANP mRNA expression (-52.2%), and protein expression of p-ERK1/2 (-18%) (all P < 0.05 vs. PTH group). PD98059 did not affect control cells without PTH treatment (all P > 0.05). CONCLUSIONS: PD98059 attenuates PTH induced cardiac hypertrophy in vitro via inhibiting the expression of ERK1/2 and p-ERK1/2.