This study explored the preservation effect of strigolactone analogs on Gastrodia elata tubers and screened out the suitable preservation measures of G. elata to provide a safer and more effective method for its storage and preservation. Fresh G. elata tubers were treated with 7FGR24, 2,4-D isooctyl ester, and maleic hydrazide, respectively. The growth of flower buds, the activities of CAT, and MDA, and the content of gastrodin and p-hydroxybenzyl alcohol were measured to compare the effects of different compounds on the storage and preservation of G. elata. The effects of different storage temperatures on the preservation of 7FGR24 were compared and analyzed. The gibberellin signal transduction receptor gene GeGID1 was cloned, and the effect of 7FGR24 on the expression level of GeGID1 was analyzed by quantitative polymerase chain reaction(qPCR). The toxicity of the G. elata preservative 7FGR24 was analyzed by intragastric administration in mice to evaluate its safety. The results showed that compared with 2,4-D isooctyl ester and maleic hydrazide, 7FGR24 treatment had a significant inhibitory effect on the growth of G. elata flower buds, and the CAT enzyme activity of G. elata was the highest, indicating that its preservation effect was stronger. Different storage temperatures had different effects on the preservation of G. elata, and the preservation effect was the strongest at 5 ℃. The open reading frame(ORF) of GeGID1 gene was 936 bp in length, and its expression level was significantly down-regulated after 7FGR24 treatment, indicating that 7FGR24 may inhibit the growth of flower buds by inhibiting the gibberellin signal of G. elata, thereby exerting a fresh-keeping effect. Feeding preservative 7FGR24 had no significant effect on the behavior and physiology of mice, indicating that it had no obvious toxicity. This study explored the application of the strigolactone analog 7FGR24 in the storage and preservation of G. elata and preliminarily established a method for the storage and preservation of G. elata, laying a foundation for the molecular mechanism of 7FGR24 in the storage and preservation of G. elata.
Animals ; Mice ; Gastrodia ; Gibberellins ; Maleic Hydrazide ; Esters

No abstract available.
Hydralazine*

Aged ; Chemical and Drug Induced Liver Injury ; Heart Failure ; Humans ; Hydrazones ; adverse effects ; Pyridazines ; adverse effects

Drug Compounding ; Ivermectin ; analogs & derivatives ; toxicity ; Neurotoxicity Syndromes ; etiology ; therapy ; Pyridazines ; toxicity

OBJECTIVETo investigate the effect of plant growth regulators on the growth and quality of Angelica dahurica var. formosana.

METHODFive plant growth regulators: chlormequat chloride (CCC), Mepiquat chloride (PIX), Gibberellic acid (GA3), Paclobutrazol (PP333) and Maleic Hydrazide (MH) were sprayed in rosette stage, the effects of these plant growth regulators (PGRs) on the growth, yield and quality of A. dahurica var. formosanaw were observed. The biological traits were first measured and then imperatorin and isoimperatorin contents in roots were determined by HPLC.

RESULTLow concentration GA3 increased the yield while not influenced the premature bolting rate and the coumarin content.

CONCLUSIONSpraying of GA3 (30 mg x L(-1)) could guarantee the growth and development of A. dahurica var. formosana to have a higher yield and maintain the active ingredients content in the root as well.

Angelica ; drug effects ; growth & development ; Chlormequat ; pharmacology ; Gibberellins ; pharmacology ; Maleic Hydrazide ; pharmacology ; Piperidines ; pharmacology ; Plant Growth Regulators ; pharmacology ; Triazoles ; pharmacology

OBJECTIVETo conduct a meta-analysis of the effect of levosimendan on B-type natriuretic peptide (BNP) levels and evaluate the therapeutic effect of levosimendan on advanced heart failure.

METHODSA meta-analysis was performed on the selected data to analyze the effect of levosimendan on BNP levels.

RESULTSLevosimendan decreased BNP by a mean of 337.66 [95%CI (-296.30, -379.02)] pg/ml 24 h after the administration, and by 259.92 [95%CI (-195.76, -324.08)] pg/ml at 48 h, and by 123.09 [95%CI(-53.32,-195.86)] pg/ml at 1 week. Levosimendan resulted in improvements of the cardiac function by about 29%, 22%, and 10% at 24 h, 48 h and 1 week after the administration.

CONCLUSIONLevosimendan produces favorable effects on the cardiac functions and BNP levels.

Cardiotonic Agents ; therapeutic use ; Heart Failure ; blood ; drug therapy ; Humans ; Hydrazones ; therapeutic use ; Natriuretic Peptide, Brain ; blood ; Pyridazines ; therapeutic use

OBJECTIVE: To analyze the clinical features of chronic myeloid leukemia (CML) with T315 I mutation (CML-T315I) and compare the effectiveness of different treatments. METHODS: We retrospectively analyzed the clinical data and outcomes of 19 patients with CML-T315I receiving different treatments. The T315 I mutations in these patients were detected by examination of BCR-ABL kinase domain (KD) mutation by RTQ-PCR and Sanger sequencing. The relapse following the treatments, defined as hematological, cytogenetic and molecular biological recurrences, were analyzed in these patients. RESULTS: Of the 19 patients with CML-T315I, 14 (73.7%) were in CML-CP stage at the initial diagnosis, and 13 (81.2%) were high-risk patients based on the Sokal scores. All the 19 patients were treated with TKI after the initial diagnosis, and during the treatment, 15 (78.9%) patients were found to have additional chromosomal aberrations, and 10 (52.6%) had multiple mutations; 13 (68.4%) of the patients experienced disease progression (accelerated phase/blast crisis) before the detection of T315I mutation, with a median time of 40 months (5-120 months) from the initial diagnosis to the mutation detection. After detection of the mutation, 12 patients were treated with ponatinib and 7 were managed with the conventional chemotherapy regimen, and their overall survival rates at 3 years were 83.3% and 14.2%, respectively ( < 0.001). CONCLUSIONS CML patients resistant to TKI are more likely to have T315I mutations, whose detection rate is significantly higher in the progressive phase than in the chronic phase. These patients often have additional chromosomal aberrations and multiple gene mutations with poor prognoses and a high recurrence rate even after hematopoietic stem cell transplantation. Long-term maintenance therapy with ponatinib may improve the prognosis and prolong the survival time of the patients.
Drug Resistance, Neoplasm ; Fusion Proteins, bcr-abl ; Humans ; Imidazoles ; Leukemia, Myelogenous, Chronic, BCR-ABL Positive ; Mutation ; Pyridazines ; Retrospective Studies

OBJECTIVETo study the drug sensitivity and analyze the replication kinetics of HIV-1 B and CRF07_BC subtypes with I132L or T139K/R mutations.

METHODSThe amino acids in position 132 and 139 of reverse transcriptase (RT) region of the infectious clone PNL4-3 (HIV-1 B subtype) were changed to L and T/R through site mutagenesis. Combined with the previously constructed infectious clone of HIV-1 CRF07_BC subtype with I132L and T139K/R mutations in RT region, mutated PNL4-3 infectious clones were transfected into 293T cells. The infection ability of mutated clones was detected. The drug sensitivity to NNRTIs (TMC-125, DLV, NVP, EFV) and the properties of replication kinetics were also evaluated.

RESULTSThe mutated infectious clones were constructed including PNL4-3-RT-I132L, PNL4-3-RT-T139K and PNL4-3-RT-T139R. The I132L and T139K/R mutations in HIV-1 B and CRF07_BC infectious clones reduced their drug sensitivity to NNRTIs, which accompanied with the increase of EC50 (concentration for 50% of maximal effect). In subtype CRF07_BC, I132L mutation increased EC50 by 2.55, 19.35, 28.05, 6.13 fold, T139K mutation increased EC50 by 4.67, 3.66, 7.35, 3.30 fold, and T139R mutation increased EC50 by 1.82, 4.69, 25.12, 1.89 fold, respectively. In subtype B, I132L increased EC50 by 3.91, 4.61, 6.38, 3.56 fold, T139K increased EC50 by 3.13, 1.78, 2.26, 2.10 fold, T139R increased EC50 by 5.79, 3.99, 5.78, 2.75 fold, respectively. Similar as wild type PNL4-3, the replication ability of 132L/139K/139R mutated infectious clones reached the peak in day 11. However, compared to wild type BC-WT, I132L/T139R mutations delayed the peak time to day 14 and 21.

CONCLUSIONThe novel drug resistance associated mutations I132L and T139K/R can reduce the drug sensitivity to NNRTIs in subtype B and CRF07_BC, and the replication ability of CRF_07BC declined by I132L mutation.

Anti-HIV Agents ; Drug Resistance ; Genotype ; HIV-1 ; Kinetics ; Mutation ; Polymorphism, Single Nucleotide ; Protein Folding ; Pyridazines ; Reverse Transcriptase Inhibitors ; Virus Replication

OBJECTIVETo investigate the preliminary efficacy and safety of ambrisentan, a selective endothelin receptor antagonist, in patients with pulmonary arterial hypertension (PAH).

METHODSA total of 15 patients with PAH, including 10 patients with idiopathic PAH and 5 patients with associated connective-tissue disease, received 2.5 mg or 5 mg of ambrisentan once daily for 12 weeks. Before and after 12 weeks treatment, 6-minute walk test (6-MWD), WHO functional classification (WHO FC) and N-terminal pro-brain natriuretic peptide (NT-proBNP) were measured.

RESULTSAfter 12 weeks treatment, the 6-MWD was significantly increased [(376.5 ± 108.2) m vs.(460.3 ± 95.7) m, P = 0.021] and the systolic pulmonary artery was significantly decreased [(85.0 ± 33.3) mm Hg (1 mm Hg = 0.133 kPa)vs. (70.5 ± 30.5) mm Hg,P = 0.015] and NT-proBNP was significantly reduced [892.0 (99.0-2245.0) ng/L vs. 205.0 (56.0-534.0) ng/L, P = 0.026] than before treatment. WHO FC was improved in 4 patients after 12 weeks treatment. No patient was withdrawn from this study for safety reasons.

CONCLUSIONSAmbrisentan treatment can effectively improve the exercise capacity, and reduce systolic pulmonary artery pressure and NT-proBNP in PAH patients. Ambrisentan use is safe and could be well tolerated in Chinese PAH patients.

Adult ; Antihypertensive Agents ; therapeutic use ; Familial Primary Pulmonary Hypertension ; Female ; Humans ; Hypertension, Pulmonary ; drug therapy ; Male ; Middle Aged ; Phenylpropionates ; therapeutic use ; Prospective Studies ; Pyridazines ; therapeutic use ; Treatment Outcome

This paper is aimed to develop rapid, sensitive and convenient HPLC-MS/MS methods for the quantification of levosimendan and its metabolites OR-1855 and OR-1896 in human plasma. According to the different natures of the compounds, two sets of liquid chromatography and ionization modes were used for determination the concentration of levosimendan and its metabolites OR-1855 and OR-1896 in human plasma, separately. Following protein precipitation with methanol, the levosimendan and internal standard (rosuvastatin) were separated on a Capcell MG III C18 column (35 mm x 2.0 mm ID, 3 microm) with the mobile phase consisted of methanol-15 mmol x L(-1) ammonium acetate-formic acid (55: 45: 0.02, v/v/v). A tandem mass spectrometer equipped with electrospray ionization source was used as the detector and operated in the negative ion mode. Its metabolites OR-1855, OR-1896 and internal standard doxofylline were extracted from plasma by liquid-liquid extraction with ethyl acetate. Chromatographic separation was performed on a Zorbax Extend C18 column (150 mm x 4.6 mm ID, 5 microm) with the mobile phase consisted of methanol-15 mmol x L(-1) ammonium acetate-formic acid (65 :35 :0.1, v/v/v). A tandem mass spectrometer equipped with electrospray ionization source was used as the detector and operated at the positive ion mode. The linear concentration ranges of the calibration curves for levosimendan and OR-1855 and OR-1896 were 0.10-50.0 ng x mL(-1), 0.20-100 ng x mL(-1), 0.20-100 ng x mL(-1), respectively. The lower limits of quantification of levosimendan and OR-1855 and OR-1896 were 0.10 ng x mL(-1), 0.20 ng x mL(-1), 0.20 ng x mL(-1), respectively. The methods proved to be sensitive, simple and rapid, and suitable for the pharmacokinetic study of levosimendan injection.
Acetamides ; blood ; Cardiotonic Agents ; blood ; metabolism ; Chromatography, High Pressure Liquid ; methods ; Humans ; Hydrazones ; blood ; metabolism ; Male ; Pyridazines ; blood ; metabolism ; Spectrometry, Mass, Electrospray Ionization ; methods ; Tandem Mass Spectrometry ; methods