Histone modifications in drug-resistant cancers: From a cancer stem cell and immune evasion perspective.

The development and immune evasion of cancer stem cells (CSCs) limit the efficacy of currently available anticancer therapies. Recent studies have shown that epigenetic reprogramming regulates the expression of characteristic marker proteins and tumor plasticity associated with cancer cell survival and metastasis in CSCs. CSCs also possess unique mechanisms to evade external attacks by immune cells. Hence, the development of new strategies to restore dysregulated histone modifications to overcome cancer resistance to chemotherapy and immunotherapy has recently attracted attention. Restoring abnormal histone modifications can be an effective anticancer strategy to increase the therapeutic effect of conventional chemotherapeutic and immunotherapeutic drugs by weakening CSCs or by rendering them in a naïve state with increased sensitivity to immune responses. In this review, we summarize recent findings regarding the role of histone modifiers in the development of drug-resistant cancer cells from the perspectives of CSCs and immune evasion. In addition, we discuss attempts to combine currently available histone modification inhibitors with conventional chemotherapy or immunotherapy.

SETD1A-SOX2 axis is involved in tamoxifen resistance in estrogen receptor α-positive breast cancer cells.

Rationale: Approximately 30-40% of estrogen receptor (ER)-positive breast cancer (BC) cases recur after tamoxifen therapy. Thus, additional studies on the mechanisms underlying tamoxifen resistance and more specific prognostic biomarkers are required. In this study, we investigated the role of the SET domain containing 1A (SETD1A), a histone H3-lysine 4 (H3K4) methyltransferase, in the development of tamoxifen resistance in BC. Methods: The relationship between tamoxifen resistance and SETD1A protein level was investigated using resistant cell lines derived from the parent BC cells. Biochemical and molecular assays, such as RNA-sequencing, reverse transcription-quantitative polymerase chain reaction, chromatin-immunoprecipitation, and protein-binding assays, were used to identify the SETD1A target gene in tamoxifen-resistant BC cells. Additionally, the role of SETD1A in cancer stem cells (CSCs) was investigated using CSCs isolated from tamoxifen-resistant BC cells. Comprehensive transcriptome analysis and immunofluorescence staining using clinical datasets and tissue microarray were performed to determine the correlation between the expression of the SETD1A-SRY-box transcription factor 2 (SOX2) pair and recurrence in tamoxifen-treated patients with BC. Results: SETD1A was expressed at higher levels in tamoxifen-resistant BC cells than in primary BC cells. Notably, SETD1A-depleted tamoxifen-resistant MCF-7 cells showed restored sensitivity to tamoxifen, whereas SETD1A overexpression in MCF-7 cells resulted in decreased sensitivity. SETD1A is recruited to the SOX2 gene via its interaction with SOX2, thereby enhancing the expression of SOX2 genes in tamoxifen-resistant BC cells. The growth of tamoxifen-resistant cells and CSCs was effectively suppressed by SETD1A knockdown. In addition, high levels of SETD1A and SOX2 were significantly correlated with a low survival rate in patients with ER-positive tamoxifen-resistant BC. Conclusion: Our findings provide the first evidence of the critical role of the SETD1A-SOX2 axis in tamoxifen-resistant BC cells, implying that SETD1A may serve as a molecular target and prognostic indicator of a therapeutic response in patients with tamoxifen-resistant BC.

Development of a Recombinase-aided Amplification Combined With Lateral Flow Dipstick Assay for the Rapid Detection of the African Swine Fever Virus / 生物医学与环境科学（英文）

OBJECTIVE@#To establish a sensitive, simple and rapid detection method for African swine fever virus (ASFV) B646L gene.@*METHODS@#A recombinase-aided amplification-lateral flow dipstick (RAA-LFD) assay was developed in this study. Recombinase-aided amplification (RAA) is used to amplify template DNA, and lateral flow dipstick (LFD) is used to interpret the results after the amplification is completed. The lower limits of detection and specificity of the RAA assay were verified using recombinant plasmid and pathogenic nucleic acid. In addition, 30 clinical samples were tested to evaluate the performance of the RAA assay.@*RESULTS@#The RAA-LFD assay was completed within 15 min at 37 °C, including 10 min for nucleic acid amplification and 5 minutes for LFD reading results. The detection limit of this assay was found to be 200 copies per reaction. And there was no cross-reactivity with other swine viruses.@*CONCLUSION@#A highly sensitive, specific, and simple RAA-LFD method was developed for the rapid detection of the ASFV.

Isolation of MLL1 Inhibitory RNA Aptamers.

Mixed lineage leukemia proteins (MLL) are the key histone lysine methyltransferases that regulate expression of diverse genes. Aberrant activation of MLL promotes leukemia as well as solid tumors in humans, highlighting the urgent need for the development of an MLL inhibitor. We screened and isolated MLL1-binding ssRNAs using SELEX (Systemic Evolution of Ligands by Exponential enrichment) technology. When sequences in sub-libraries were obtained using next-generation sequencing (NGS), the most enriched aptamers-APT1 and APT2-represented about 30% and 26% of sub-library populations, respectively. Motif analysis of the top 50 sequences provided a highly conserved sequence: 5΄-A[A/C][C/G][G/U][U/A]ACAGAGGG[U/A]GG[A/C] GAGUGGGU-3΄. APT1, APT2, and APT5 embracing this motif generated secondary structures with similar topological characteristics. We found that APT1 and APT2 have a good binding activity and the analysis using mutated aptamer variants showed that the site information in the central region was critical for binding. In vitro enzyme activity assay showed that APT1 and APT2 had MLL1 inhibitory activity. Three-dimensional structure prediction of APT1-MLL1 complex indicates multiple weak interactions formed between MLL1 SET domain and APT1. Our study confirmed that NGS-assisted SELEX is an efficient tool for aptamer screening and that aptamers could be useful in diagnosis and treatment of MLL1-mediated diseases.

BAF53A regulates androgen receptor-mediated gene expression and proliferation in LNCaP cells.

The actin-like protein of the SWI/SNF complex, BAF53A, regulates gene expression by the gene-specific chromatin remodeling of target genes. However, the function of BAF53A in the androgen receptor pathway in prostate cancer cells remains unclear. Here, we demonstrated that BAF53A positively regulates the expression of endogenous AR target genes (e.g. PSA, TMPRSS2, FKBP5, and KLK2) in LNCaP cells. It functions as a coactivator in AR-mediated transcription by interacting with other nuclear receptor coactivators, such as p300 and FLII, and is associated with AR in the presence of dihydrotestosterone (DHT). The DHT-induced recruitment of BAF53A to the proximal and distal androgen response elements (AREs) of the PSA gene in the presence of BRG1 (but not BRM) was inhibited by an AR antagonist, suggesting the coactivator function of BAF53A in the SWI/SNF complex. Depletion of BAF53A in LNCaP cells resulted in a significant decrease in growth rate. Furthermore, the expression of BAF53A in prostate cancer tissue was significantly elevated, compared to that in normal prostate tissue, and correlated with the expression of AR, and BRG1, but not BRM. Therefore, our results suggested that BAF53A plays an important role in the expression of AR target genes in prostate cancer, and can be used clinically for the treatment of prostate cancer.

Aberrant expression of SETD1A promotes survival and migration of estrogen receptor α-positive breast cancer cells.

The histone H3 lysine 4-specific methyltransferase SETD1A is associated with transcription activation and is considered a key epigenetic regulator that modulates the cell cycle and metastasis in triple-negative breast cancer cells. However, the clinical role of SETD1A in estrogen receptor (ER)-positive breast cancer cells remains unclear. Here, we examined whether SETD1A is a potential target for ERα-positive breast cancer therapy. SETD1A expression was upregulated in breast tumor tissue compared to that in normal breast tissue. Moreover, ER-target genes regulated by SETD1A were particularly enriched in cell cycle and cancer pathways. SETD1A is involved in histone H3K4 methylation, subsequent recruitment of ERα, and the establishment of accessible chromatin structure at the enhancer region of ERα target genes. In addition to ERα target genes, other cell survival genes were also downregulated by SETD1A depletion in MCF-7 cells, leading to significant decrease in cell proliferation and migration, and spontaneous induction of apoptosis. We also found that miR-1915-3p functioned as a novel regulator of SETD1A expression in breast cells. Importantly, the growth of tamoxifen-resistant MCF-7 cells was effectively repressed by SETD1A knockdown. These results indicate that SETD1A may serve as a molecular target and prognostic indicator in ERα-positive breast cancer.

Differentiation grade for extrahepatic bile duct adenocarcinoma: Assessed by diffusion-weighted imaging at 3.0-T MR.

PURPOSE-: To assess the pathological differentiation grade in the patients with extrahepatic bile duct adenocarcinoma (EBDA) using diffusion-weighted imaging (DWI) at 3.0-T MR. METHODS-: Sixty-eight patients who were clinically and histologically diagnosed with EBDA underwent abdominal DWI within 2 weeks before surgery. The lesion signal intensity, signal intensity ratio of the lesion and hepar (SIR-LH) value, and apparent diffusion coefficient (ADC) value in patients with EBDA were retrospectively analysed. RESULTS: -In the 68 patients, 22 well-differentiated, 36 moderately-differentiated, and 10 poorly-differentiated EBDAs were histopathological confirmed. These EBDAs exhibited hyper-intensity on DWI in 95.59% of patients. Hyper-intensity lesions were found in 90.91% of patients with good-differentiation, in 97.22% with moderate-differentiation and in 100% with poor-differentiation. There showed no statistical difference for the lesion signal intensity (P=0.426) and SIR-LH value (P=0.766) on DWI among three groups. The median ADC value of the well-differentiated, moderately-differentiated and poorly-differentiated EBDAs were 1.506×10-3mm2/s, 1.275×10-3mm2/s and 1.154×10-3mm2/s, respectively. As the pathological differentiation grade decreased, the lesion ADC value of EBDA gradually declined (x2=51.220, P=0.000). The ADC value <1.184×10-3mm2/s can predict the poorly-differentiated EBDA with a sensitivity of 100% and a specificity of 94.83%. The ADC value >1.316×10-3mm2/s can forecast the well-differentiated EBDA with a sensitivity of 100% and a specificity of 84.78%. CONCLUSIONS-: The histopathological differentiation grade of EBDA can be detected non-invasively using DWI at 3.0-T MR.

Identification of human cytomegalovirus phosphoprotein 65 in C57BL/6 and BXSB mice as a potential trigger of systemic lupus erythematosus related serum markers

Objective: To investigate the potential role of human cytomegalovirus lower matrix phosphoprotein 65 (HCMV-pp65) in murine systemic lupus erythematosus (SLE). Methods: The prokaryotic plasmid pET-28b-pp65 was constructed to express the HCMVpp65 protein. BXSB mice and C57BL/6 mice were inoculated with pp65 eukaryotic plasmid pcDNA3.0-pp65 intramuscularly 5 times at 2-week intervals, and then the blood of the mice was subsequently collected via the retro-orbital vein. Indirect ELISAs were used to evaluate the concentration of anti-pp65 immunoglobulin G, anti-double-stranded DNA and antinuclear antibodies. Interleukin-1β and tumor necrosis factor-α were also determined by competitive ELISA. At the same time, 3 major SLE-related circulating microRNAs were examined by quantitative RT-PCR. Results: The early production of autoantibodies was observed in pp65-immunized male BXSB as well as C57BL/6 mice. Overexpression of interleukin-1β and tumor necrosis factor-α were detected in pp65-immunized male BXSB mice. Quantitative RT-PCR analyses showed that three SLE related microRNAs (microRNA-126, microRNA-125a, and microRNA-146a) were downregulated in peripheral blood mononuclear cells of pp65-immunized mice. Conclusions: Our findings indicate that HCMV-pp65 immunization strongly triggers the development and progression of SLE-like disease in both BXSB and C57BL/6 mice, which indicates that the immune responses induced by HCMV-pp65 may be involved in the development of SLE.

Changes of the spectrum on thyroid disease after the ten-year implementation of universal salt iodization in Guangxi Zhuang Autonomous Region / 中华流行病学杂志

<p><b>OBJECTIVE</b>To reveal the relationship between iodine nutrition and the change of spectrum on thyroid diseases through comparing the different iodine environments pre- and post- the universal salt iodization(USI)campaign.</p><p><b>METHODS</b>To compare the urinary iodine concentration between 1000 normal people and 5998 patients with thyroid disease who had undergone surgical operations, from 4 major cities, including iodine deficient and rich areas of Guangxi Zhuang Autonomous Region.</p><p><b>RESULTS</b>After USI was put into practice, the urinary iodine concentration of patients with thyroid appeared higher than those of normal people(324.3 µg/L vs. 238.5 µg/L, P < 0.05). The urinary iodine concentrations of nodular goiter,Graves disease, toxic nodular goiter, thyroid papillary carcinoma and Hashimoto's thyroiditis were higher than those before the USI was taken(263.8 µg/L vs. 69.75 µg/L, 289.7 µg/L vs. 228.3 µg/L, 346.8 µg/L vs. 268.4 µg/L, 350.3 µg/L vs. 316.2 µg/L and 378.5 µg/L vs. 305.8 µg/L). The proportions of toxic nodular goiter, thyroid papillary carcinoma and Hashimoto's thyroiditis appeared as 7.59% vs. 4.80%, 5.85% vs. 4.02% and 3.88% vs. 2.46%, all higher than those before the implementation of USI, except the nodular goiter which showed a reduction (63.56% vs. 69.75%).</p><p><b>CONCLUSION</b>The spectrum of thyroid diseases appeared an obvious change in Guangxi within the last 10-year implementation of USI. However, the excessive intake of iodine might serve as a risk factor for toxic nodular goiter, thyroid papillary carcinoma and Hashimoto's thyroiditis.</p>

Study on prescription screening and preparation process of compound danshen pulse capsule / 中国中药杂志

To develop gastric floating erodible plug pulse capsules with compound Danshen as the model drug, in order to realize the pulse release of traditional Chinese medicines. Through the study on impermeable capsules, optimized prescriptions, drug-containing rapid-release tablets and prescription screening, and erodible plug prescription and process, we successfully prepared compounded Danshen pulse capsule, so as to provide a new dosage form for controlling and treating heart disease to better cater to clinical demands.

Nosocomial spread of hospital-adapted CC17 vancomycin-resistant Enterococcus faecium in a tertiary-care hospital of Beijing, China / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>The incidence of vancomycin-resistant enterococci (VRE) appeared to be increasing in China, but very few nosocomial outbreaks have been reported. Our hospital had experienced an outbreak of VRE since March 2008 to March 2009. The objective of this study was to analyze the molecular features of the isolates and the control measures used to eradicate a VRE outbreak in a tertiary institution in China.</p><p><b>METHODS</b>We characterized VRE isolates from 21 infected and 11 colonized inpatients from a single hospital by pulsed field gel electrophoresis (PFGE), multilocus sequence typing (MLST), the analysis of Tn1546-like elements and virulence genes detection. Infection control measures, including more environmental disinfection, screening for VRE colonization, contact precautions, education and strict antibiotic restriction, were implemented to control the outbreak.</p><p><b>RESULTS</b>During the outbreak, a total of 32 VRE strains were obtained. There were 21 strains found in Emergency Intensive Care Unit (EICU), 9 isolates from Geriatric Ward, and two from other units. All the isolates harbored the vanA gene, however, four of them exhibited the VanB phenotype. Meanwhile, MLST analysis revealed that all isolates belonged to clonal complex (CC) 17. With the infection-control measures, the epidemic was constrained in two units (EICU and Geriatric Ward). After March 2009, no further case infected with VRE was detected in the following one-year period.</p><p><b>CONCLUSION</b>The outbreak was controlled by continuous implementation of the infection control programme, and more rigorous infection control policy is needed.</p>

Sequence analysis of the phosphoprotein gene of peste des petits ruminants virus of Chinese origin / 病毒学报

The nucleotide sequences of P gene from a field strain of peste des petits ruminants virus (PPRV) ("China/Tib/Gej/07-30") was firstly determined. The P gene is 1,655 nucleotides long with two overlapping open reading frames (ORFs). The first ORF is 1530 nucleotides long and would produce P protein of 509 amino acid residues. The second ORF is 534 nucleotides long and would produce C protein of 177 amino acid residues. The first ORF produces a second mRNA transcript of 897 nucleotides long with an extra G nucleotide at position 751. Translation from this mRNA would produce V protein of 298 amino acid residues. The nucleotide and deduced amino acid sequence were compared with the homologous region of other PPRV isolates. At the amino acid level, the "China/Tib/Gej/07-30" shares homology of 86.10%-97.3%, 84.3%-94.9%, and 82.9%-96.3% for P, C, and V proteins respectively. Several sequence motifs in the P genes were identified on the basis of conservation in the PPRVs and the morbilliviruses.

Detection of molecular markers of amantadine resistance in avian influenza viruses by pyrosequencing / 病毒学报

Mutation in any of five key amino acid residues (at positions 26, 27, 30, 31 and 34) within the M2 protein of influenza A viruses leads to resistance against the amantodine class of anti-influenza drugs. In this study, a pyrosequencing method was described to rapidly detect established five molecular markers of resistance to M2 blockers, amantadine. The residues L26, V27, A30, S31 and G34 in the M2 protein were targeted for pyrosequencing, and 94 avian influenza viruses were used to perform the amantadine resistance analysis. Our results showed that most of avian influenza viruses were amantadine resistant, Mutations V27I and S31N were founded in these isolates.

Sequence analysis of the matrix protein and fusion protein genes of a field peste des petits ruminants virus strain from Tibet, China / 病毒学报

The nucleotide sequences of M and F genes from a field strain of peste des petits ruminants virus (PPRV) ("China/Tib/Gej/07-30") was firstly determined. The M gene was 1 483 nucleotides in length with a single open reading frame (ORF), encoding a protein of 335 amino acids. The F gene was 2411 nucleotides in length, encoding a protein of 546 amino acids. The resulting nucleotide sequence and the deduced amino acid sequences were compared with the homologous regions of other PPRV isolates. The nucleotide sequences of M and F genes of the "China/Tib/Gej/07-30" was 92.4%-97.7% and 85.5%-96.1% identical to other PPRV isolates, respectively, while a homology of 97.0%-98.2% and 94.3%-98.2% could be observed at the amino acids level respectively. Several sequence motifs in the M and F genes had been identified on the basis of conservation in the PPRVs and the morbilliviruses. The 3' untranslated region of M gene was 443 nucleotides in length with 82.4%-93.5% identical to other PPRV isolates. The 5' untranslated region of F gene was 634 nucleotides in length with 76.2%-91.7% identical to other PPRV isolates.

External quality assessment on detection of hepatitis C virus RNA in clinical laboratories of China / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>As with many studies carried out in European countries, a quality assurance program has been established by the National Center for Clinical Laboratories in China (NCCL). The results showed that the external quality assessment significantly improves laboratory performance for quantitative evaluation of hepatitis C virus (HCV) RNA.</p><p><b>METHODS</b>Serum panels were delivered twice annually to the clinical laboratories which performed HCV RNA detection in China. Each panel made up of 5 coded samples. All laboratories were requested to carry out the detection within the required time period and report on testing results which contained qualitative and/or quantitative test findings, reagents used and relevant information about apparatus. All the positive samples were calibrated against the first International Standard for HCV RNA in a collaborative study and the range of comparison target value (TG) designated as +/- 0.5 log.</p><p><b>RESULTS</b>The numbers of laboratories reporting on qualitative testing results for the first and second time external quality assessment were 168 and 167 in the year of 2003 and increased to 209 and 233 in 2007; the numbers of laboratories reporting on quantitative testing results were 134 and 147 in 2003 and rose to 340 and 339 in 2007. Deviation between the mean value for quantitative results at home in 2003 and the target value was above 0.5 log, which was comparatively high. By 2007, the target value was close to the national average except for the low concentrated specimens (10(3) IU/ml). The percentage of results within the range of GM +/- 0.5 log(10) varied from 8.2% to 93.5%. Some laboratories had some difficulties in the exact quantification of the lowest (3.00 log IU/ml) as well as of the highest viral levels (6.37 log IU/ml) values, very near to the limits of the dynamic range of the assays.</p><p><b>CONCLUSIONS</b>The comparison of these results with the previous study confirms that a regular participation in external quality assessment (EQA) assures the achievement of a high proficiency level in the diagnosis of HCV infection. During the 5-year external quality assessment, sensitivity and accuracy of detection in most of the clinical laboratories have been evidently improved and the quality of kits has also been substantially improved.</p>

Sequence analysis of the nucleocapsid gene and genome promoter region of peste des petits ruminants virus of Chinese origin / 病毒学报

The N gene and genome promoter nucleotide sequence of a Chinese Peste des petits rumiants virus (PPRV) ("China/Tib/Gej/07-30") was firstly determined. The length of N gene was 1689 nucleotides with a single open reading frame (ORF). The nucleotide and deduced amino acid sequence was compared with the homologous region of other PPRV isolates. The nucleotide sequence of the "China/Tib/Gej/07-30" was 91.7%-97.6% identical to other PPRV isolates, while a homology of 94.9%-98.5% could be observed at the amino acids level. The N gene encoded a protein of 525 amino acids. Several sequence motifs were identified on the basis of conservation in the PPRVs and the morbilliviruses. The genome length of promoter region was 107 nucleotides with 91.8%-98.2% identity to other PPRV isolates. Phylogenetic analysis showed that the "China/Tib/Gej/07-30" belonged to the Asian lineage.

Establishment of the first national standards for nucleic acid amplification technology assay for HBV DNA / 中华肝脏病杂志

<p><b>OBJECTIVES</b>To establish a Chinese national standard for a nucleic acid test (NAT) for HBV DNA.</p><p><b>METHODS</b>The candidate sample of HBV DNA positive plasma was diluted with HBV-negative human plasma. The sample was lyophilised with a concentration of approximately 300,000 copies/ml. The measurement methods used included Roche Amplicor assay (version 2.0) and real-time PCR. The lyophilised preparation was calibrated by the international standard (NIBSC code: 97/746) from NIBSC.</p><p><b>RESULTS</b>The quantity of this lyophilised preparation was (1.29+/-0.24) x 10(5)IU/ml in comparison with the international standard for HBV DNA 97/746. The stability test indicated that the sample was stable at room temperature (20 to 25 degrees C) for 2 weeks and at 37 degrees C for at least 1 week. Long-term stability was observed at 2 to 8 degrees C for 6 months and at -20 degrees C for more than 2 years with no significant changes. The vial-to-vial imprecision rate was 3.53%.</p><p><b>CONCLUSION</b>Based on the results of this study, our lyophilized sample can be used as a standard in China for the nucleic acid test (NAT) for HBV DNA.</p>

Lyophilized standards for the calibration of real time PCR assay for hepatitis C virus RNA / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Since October 1997, an international standard for hepatitis C virus (HCV) nucleic acid amplification technology assay, 96/790, has been available. We compared a series of lyophilized standards with known HCV RNA concentrations against the international standard in fluorescence quantitative PCR detection.</p><p><b>METHODS</b>A series of lyophilized sera were calibrated by ROCHE COBAS AMPLICOR HCV Monitor test against the international standard and sent to various manufacturers to analyse the samples using their own kits. Then calibration curves from the series were compared with that obtained from the external standard calibration curve with the manufacture's series.</p><p><b>RESULTS</b>The standard calibration curve with the series of lyophilized serum showed an excellent correlation (R(2) > 0.98), slope and intercept that were similar to those from the manufacture's series. When the standard calibration curve from the series of lyophilized standards were used to define the values of the given sample, lower coefficients of variation between kits from different manufactures were obtained.</p><p><b>CONCLUSION</b>The results showed that the lyophilized standards could be used to setup the standard calibration curve for clinical HCV RNA quantitative PCR detection.</p>

The preparation of arabinogalactan and the mechanism of release / 中国中药杂志

<p><b>OBJECTIVE</b>The study is the research on the preparation of arabinogalactan (AG) dropping pills and the releasing mechanism.</p><p><b>METHOD</b>Use the orthogonal test to find out the best way to produce and advance the preparation of AG dropping pills, analysis according to the chart and DSC to find the releasing mechanism.</p><p><b>RESULT</b>The best preparation conditions are: the liquid of AG is at 75 degrees C, the temperature above the polydimethls iloxane is 30 degrees C, the distance to the frizzed liquid is 6 cm, the speed of the liquid is 30 drop x min(-1). The chart and DSC suggest: The solid disoperation of AG-PREG 4000 the complex is in a certain form which made the melting point decreased obviously, so as to increase the solution of the medicine in carrier to increase the releasing speed.</p><p><b>CONCLUSION</b>The best preparation is reasonable, AG and carrier become a form, the melting point is low, it can release fast.</p>

The study on the treatment of Oviducts Ranae protein with enzyme hydrolysis / 中国中药杂志

The paper introduced a process to enhance the yield of Oviducts Ranae protein using in vitro enzyme hydrolysis. The treatment process included two steps: (1) a 3 - 4 h of hydrolysis of a 0.025 g x g(-1) concentration of substance, at pH 7 and 60 degrees C, using 4% of papain; and (2) followed with a 6 - 8 h hydrolysis, at pH 2 - 2.5 and 60 degrees C, using 3% of pepsin. This treatment process significantly improved the lyophilized Oviducts Ranae in solubility and fluidity, which is convenient for the relative pharmaceutical preparations.