Predictive value of isoform -2 proprostate-specific antigen and its derived indexes for prostate cancer patients with PSA 4-20 ng/mL / 现代泌尿外科杂志

【Objective】 To evaluate the predictive value of isoform [-2] proprostate-specific antigen, p2 PSA (p2PSA) and its derived indexes for prostate cancer in a Chinese cohort with PSA 4-20 ng/mL. 【Methods】 A total of 139 males scheduled for biopsy were enrolled in the prospective study from Nov.2021 to Jun.2022. The total PSA (tPSA), free PSA (fPSA), fPSA/tPSA (f/t) and p2PSA were collected, and the percentage of p2PSA(%p2PSA) and prostate health index(PHI) were calculated. The predictive value of p2PSA and its derived indexes were compared with traditional indexes with receiver operating characteristic (ROC) curve and Logistic analysis. 【Results】 Prostate cancer was found in 54 cases (38.8%). There were significant statistical differences in tPSA(10.68 vs.8.14, P=0.021), f/t(0.13 vs.0.16, P=0.006), p2PSA(30.25 vs.19.81, P<0.001), %p2PSA(21.52 vs.13.15, P<0.001) and PHI(64.3vs.38.2, P<0.001) between prostate cancer patients and non-prostate cancer patients. The area under the ROC curve (AUC) of tPSA, fPSA, %fPSA, p2PSA, %p2PSA and PHI were 0.63, 0.51, 0.63, 0.71, 0.73, and 0.80, respectively. The inclusion of %p2PSA and PHI significantly increased the prediction efficiency of the basic prediction model (AUCbase+PHI=0.81, AUCbase+%p2PSA=0.78, AUCbase=0.67). With 35 as the recommended cut-off value of PHI, the incidence of meaningless puncture was reduced by 25.8%(36/139). 【Conclusion】 The application of p2PSA and its derived indexes have good predictive value for patients with PSA 4-20 ng/mL. The combined detection of %p2PSA and PHI can significantly increase the detection efficiency of prostate cancer and reduce the incidence of meaningless prostate puncture by 25.8%.

Principal component analysis of categorized parameters in periprocedural myocardial injury following percutaneous coronary intervention

Objective: The elevation of troponin-T (Trop-T) or creatinine kinase myocardial isoform (CKMB) is very common during the percutaneous coronary intervention (PCI). A study was attempted to determine the correlation between elevated Trop-T or CKMB and the parameters of PCI by using multivariate analysis, especially principal component analysis (PCA). Materials and Methods: A prospective observational study was carried out among 100 patients who underwent PCI for stable coronary artery disease in which 31 and 37 patients were found to have elevated Trop-T and CKMB (>3 times) following PCI. The correlation was studied between Trop-T or CKMB (dependent variable) and different parameters, viz., total stent length (mm), fluoroscopy time (min), lesion strength, left ventricular (LV) function, procedural complications, type of lesions, vessels treated with drug eluting stent (DES), and major adverse cardiac events (MACE) as independent variables. Results: For Trop-T, the principal component (PC)-1 and PC-2 obtained 63.49% and 30.88% of the original variation. For PC-1 and PC-2, maximum positive loading was recorded for stent length followed by fluoroscopy time and for LV but negative loading for the type of lesion and type of stent (DES vs bare metal stent [BMS]). For CKMB, the PC-1 and PC-2 obtained 61.22% and 32.08% of the original variation. For PC-1 and PC-2, maximum positive loading was recorded for stent length and fluoroscopy time followed by vessel treated but negative loading for the type of stent and MACE, and maximum positive loading recorded for LV function but negative loading for the type of lesion. Conclusion: This study indicates which factors are most important in preventing periprocedural myocardial injury during PCI and may be a suitable tool to prevent myocardial injury and for subsequent less MACE and better patient outcomes.

Role of M2 isoform of pyruvate kinase in diabetic retinopathy / 国际眼科杂志(Guoji Yanke Zazhi)

@#Diabetic retinopathy(DR), one of the most common diabetes-specific microvascular complications, is classically described by intraretinal microvascular abnormalities and neovascularization. It is the main reason why visual impairment and blindness in people aged 20-65 years worldwide. Glycolysis can provide energy by converting glucose into pyruvate. Endothelial cells mainly utilize glycolysis to produce ATP to maintain the function, including forming tight junctions and barrier functions. Pyruvate kinase(PK)M2(M2 isoform of pyruvate kinase)is a key enzyme of glycolysis and is widely expressed in most tissues. As major cellular components in the retina, endothelial cells and photoreceptor cells play a crucial role in the occurrence and development of DR. Studies have shown that PKM2 takes part in the development of DR by regulating the function of endothelial cells and photoreceptors in metabolic and non-metabolic ways. Therefore, this article overviews the role of PKM2 in DR from the direction of endothelial cells and photoreceptor cells and provides new insight into the diagnosis and treatment of DR.

Effects and significance of continuous hemoperfusion on patients with diquat poisoning / 中华危重病急救医学

Objective:To investigate the effect of continuous hemoperfusion (HP) on the levels of soluble CD14 isoform (sCD14-st) and neutrophil gelatinase-associated lipocalin (NGAL) on patients with diquat (DQ) poisoning and its significance.Methods:A total of 86 patients with acute DQ poisoning admitted to the department of emergency medicine, Harrison International Peace Hospital Affiliated to Hebei Medical University from May 2018 to August 2021 were enrolled and divided into the intermittent HP group (40 cases) and the continuous HP group (46 cases) according to the random number table method. All patients received basic treatment and continuous veno-venous hemofiltration (CVVH) within 24 hours after admission. On this basis, the intermittent HP group received HP treatment within 2 hours, lasting 2 hours each time for every 8 hours, 3 times in all; the continuous HP group received continued HP treatment until there was no DQ component in urine samples. Serum NGAL levels were detected in all patients before treatment and at 3 hours, 12 hours, 24 hours, 2 days, 3 days, 5 days, and 7 days after treatment. At the same time, serum sCD14-st, blood lactate (Lac), arterial partial pressure of oxygen (PaO 2), serum creatinine (SCr), MB isoenzyme of creatine kinase (CK-MB) and interleukin-18 (IL-18) levels were detected before treatment and at 24 hours, 3 days, and 7 days after treatment. Kaplan-Meier survival curve was drawn to analyze the 28-day survival of patients. Results:Before treatment, there was no significant difference in serum NGAL, sCD14-st, Lac, PaO 2, SCr, CK-MB and IL-18 levels between the two groups. With the prolongation of treatment, the serum levels of NGAL, sCD14-st, Lac, SCr, CK-MB and IL-18 in the intermittent HP group increased at first and then decreased. Serum levels of NGAL, sCD14-st, CK-MB and IL-18 reached their peaks at 24 hours after treatment, and the Lac and SCr levels reached their peaks at 3 days after treatment. In addition, the levels of the above indexes at each time point in the continuous HP group were all significantly lower than those in the intermittent HP group [after 24 hours of treatment: NGAL (μg/L) was 345.90±30.75 vs. 404.24±38.79, sCD14-st (ng/L) was 1 941.88±298.02 vs. 2 656.35±347.93, CK-MB (U/L) was 30.67±9.11 vs. 43.28±8.06, IL-18 (ng/L) was 139.49±16.29 vs. 177.98±27.85; 3 days of treatment: Lac (mmol/L) was 2.98±0.26 vs. 3.72±0.49, SCr (μmol/L) was 125.01±24.24 vs. 156.74±28.88; all P < 0.05]. However, there was no significant difference in PaO 2 levels between the two groups at each time point after treatment. The Kaplan-Meier survival curve showed that the 28-day mortality of patients in the continuous HP group was significantly lower than that in the intermittent HP group [26.09% (12/46) vs. 52.50% (21/40); Log-Rank test: χ2 = 7.288, P = 0.007]. Conclusion:Continuous HP could effectively reduce serum sCD14-st, NGAL levels and 28-day mortality in patients with DQ poisoning, with good curative effect.

Quantitative Characterization of the Chemical Space Governed by Human Carbonic Anhydrases and selenium-containing derivatives of solfonamides

Abstract Due to the fact that different isoforms of carbonic anhydrase play distinct physiological roles, their diseases/disorders involvement are different as well. Involvement in major disorders such as glaucoma, epilepsy, Alzheimer's disease, obesity and cancers, have turned carbonic anhydrase into a popular case study in the field of rational drug design. Since carbonic anhydrases are highly similar with regard to their structures, selective inhibition of different isoforms has been a significant challenge. By applying a proteochemometrics approach, herein the chemical interaction space governed by acyl selenoureido benzensulfonamides and human carbonic anhydrases is explored. To assess the validity, robustness and predictivity power of the proteochemometrics model, a diverse set of validation methods was used. The final model is shown to provide valuable structural information that can be considered for new selective inhibitors design. Using the supplied information and to show the applicability of the constructed model, new compounds were designed. Monitoring of selectivity ratios of new designs shows very promising results with regard to their selectivity for a specific isoform of carbonic anhydrase.

Effects of different subtypes of Numb protein subtypes on liver fibrosis-related signaling pathways / 临床肝胆病杂志

Liver fibrosis is the only way for various chronic liver diseases to develop into liver cirrhosis and is a reversible pathological state. However, how to prevent or reverse the development and progression of liver fibrosis is still an important scientific problem to be solved in clinical practice. As an important cell fate determinant, Numb has been shown to be closely associated with the development of many diseases. In the fibrotic environment, different subtypes of Numb protein are translated due to the selective shear action of the Numb gene, which have different regulatory effects on the activation of different signaling pathways and the differentiation of liver stem cells. At present, there are few reports on the role of Numb protein subtypes in liver fibrosis. This article reviews the regulatory effect of different Numb protein subtypes on the Notch, Hedgehog, and P53 signaling pathways and liver stem cells and elaborates on their potential application prospects in the treatment of liver fibrosis.

Analysis of WCID-cIEF Spectrogram of Recombinant Interleukin-15 Fusion Protein / 中国药学杂志

OBJECTIVE: To analyze the glycosylated chains of recombinant interleukin-15 fusion protein using capillary isoelectric focusing-whole column imaging detection (WCID-cIEF) spectrograms. METHODS: Using established corresponding mathematical models and the least square method, the WCID-cIEF spectrograms of whole protein, de-salicylic-acid protein and de-N-glycosylation-chain protein were analyzed. Among the mathematical models, the interval-1-peak model was selected. And according to the model, the relationship between isoform peak-areas and isoelectric points was listed. RESULTS: The rationality of the interval-1-peak model was confirmed and a series of basic data was obtained according to the model as follows:the apparent m value of the protein was 25.53 reference(R), the apparent n value of the protein was 28.83R, the apparent m value of sialic acid was 0.86 (0.855) R, the apparent n value was 0.12 (0.119) R, the apparent n value of N-acetylglucosamine (undifferentiated from N-acetylgalactosamine) was 0.06(0.061) R, and the apparent m value of formed carboxyl after N-chain removal was 0.19 (0.186) R. Some information of protein sugar composition was also obtained: the sialylation degree was about 1.83 mol•mol-1, the percentage of prototype protein was about 8.3%, the percentage of single N-glycosated modification protein was about 19.8%, the percentage of double N-glycosated modification protein was about 28.4%, the percentage of triple N-glycosated modification protein was about 23.7%, and the percentage of O-glycosated modification (with sialic acid) protein was about 19.8%. The main sugar types should be G0 (F), G1 (F), G2 (F), G1A1 (F), and G2A1 (F). CONCLUSION: The structure of sugar chain is complex, but it also has some repeatability and regularity. We hope that through this study, the glycoprotein sugar chain can be quickly outlined, the understanding of glycoprotein and the study of protein interaction can be improved.

Effect of Qingzao Jiufei Tang on Rate-limiting Enzymes HK2, PFK2 and PKM2 in Glycolytic Pathway in Lewis Lung Cancer-bearing Mice Cells / 中国实验方剂学杂志

Objective::To study the effect of Qingzao Jiufei Tang on the expression of key limiting enzymes hexokinase 2(HK2), phosphofructokinase 2(PFK2) and pyruvate kinase M2 (PKM2), and the glucose content in Lewis mice colon cancer cells. Method::A total of 50 male C57BL/6J mice were randomly divided into model group, chemotherapy group, and high, middle and low-dose Qingzao Jiufei Tang groups, with 10 mice in each group. The lung cancer cell model was established by injecting Lewis lung cancer cells into the right axilla. The high, middle and low dose groups were administered at the doses of 11, 5.5, 2.75 g·kg-1·d-1 for 2 weeks before modeling. The drug was administered through intraperitoneal injection at a dose of 50 mg·kg-1·(2 d)-1 in the chemotherapy group. The model group was intragastrically administered with an equal volume of normal saline. After the inoculation, the drug was administered for two weeks. Two weeks later, all of the mice were put to death, and tumor tissues were collected. The mRNA expression of HK2 was detected by Real-time PCR. the protein expression of PFK2 was detected by Western blot, the PKM2 activity was detected by enzyme-linked immunosorbent assay (ELISA). Result::Compared with the model group, mRNA expressions and activity of PKM2 in lung cancer cells of treatment groups were significantly declined, and glucose content increased significantly, with significant differences from those of model group (P<0.01). The PFK2 protein expressions in lung cancer cells of treatment groups (high, medium and low-dose groups) were significantly decreased (P<0.05, P<0.01). Conclusion::Qingzao Jiufei Tang could inhibit Lewis proliferation, and decrease the glucose intake in lung cancer cells. The effect targets may be the key rate-limiting enzymes HK2, PFK2, PKM2.

Roles of PTBP1 in alternative splicing, glycolysis, and oncogensis / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

Polypyrimidine tract-binding protein 1 (PTBP1) plays an essential role in splicing and is expressed in almost all cell types in humans, unlike the other proteins of the PTBP family. PTBP1 mediates several cellular processes in certain types of cells, including the growth and differentiation of neuronal cells and activation of immune cells. Its function is regulated by various molecules, including microRNAs (miRNAs), long non-coding RNAs (lncRNAs), and RNA-binding proteins. PTBP1 plays roles in various diseases, particularly in some cancers, including colorectal cancer, renal cell cancer, breast cancer, and glioma. In cancers, it acts mainly as a regulator of glycolysis, apoptosis, proliferation, tumorigenesis, invasion, and migration. The role of PTBP1 in cancer has become a popular research topic in recent years, and this research has contributed greatly to the formulation of a useful therapeutic strategy for cancer. In this review, we summarize recent findings related to PTBP1 and discuss how it regulates the development of cancer cells.

Roles of PTBP1 in alternative splicing, glycolysis, and oncogensis / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

Polypyrimidine tract-binding protein 1 (PTBP1) plays an essential role in splicing and is expressed in almost all cell types in humans, unlike the other proteins of the PTBP family. PTBP1 mediates several cellular processes in certain types of cells, including the growth and differentiation of neuronal cells and activation of immune cells. Its function is regulated by various molecules, including microRNAs (miRNAs), long non-coding RNAs (IncRNAs), and RNA-binding proteins. PTBP1 plays roles in various diseases, particularly in some cancers, including colorectal cancer, renal cell cancer, breast cancer, and glioma. In cancers, it acts mainly as a regulator of glycolysis, apoptosis, proliferation, tumorigenesis, invasion, and migration. The role of PTBP1 in cancer has become a popular research topic in recent years, and this research has contributed greatly to the formulation of a useful therapeutic strategy for cancer. In this review, we summarize recent findings related to PTBP1 and discuss how it regulates the development of cancer cells.

Clinical features of different isoforms of PML鄄RARα fusion gene in patients with acute promyelocytic leukemia / 白血病·淋巴瘤

Objective To explore the clinical features and prognosis of different PML_RARα fusion gene isoforms in acute promyelocytic leukemia (APL). Methods The clinical data of 78 patients initially diagnosed with APL in Fujian Medical University Union Hospital from February 2013 to July 2016 were collected. The clinical features and prognosis of different PML_RARα fusion gene isoforms were analyzed. Results There were 32 females (41%) and 46 males (59%) in 78 patients, with a median age of 40 years old (13-68 years old). The most common PML_RARα fusion gene was L type (48.7%, 38/78), followed by S type (46.2%, 36/78) and V type (5.1%, 4/78). The patients with white blood cell count more than 10×109/L (high_risk) occurred mostly in S type (61.1%, 22/36), compared with V type and L type, and there were statistically different (χ 2 ＝ 7.683, P < 0.05). A total of 78 patients included 8 cases (10.2%) of combined CD34 positive, 17 cases (21.8%) of combined FLT3_ITD mutation, 12 cases (15.4%) of combined DNMT3A mutation and 9 cases (11.5%) of additional chromosomal abnormalities. There were no significant differences in CD34 positive, FLT3_ITD, DNMT3A, and the incidence of additional chromosomal abnormalities among the three different isoforms (P＞0.05). The most common occurrence of retinoic acid syndrome (RAS) during treatment was S type (21/36), while rare for L type and V type (χ2＝ 7.633, P< 0.05). There were no statistical differences in the complete remission (CR) rate and disease_free survival rate among the patients with different PML_RARα isoforms (P＞0.05). Conclusions The clinical characteristics of different PML_RARα fusion gene isoforms are different, including most_common L type, more_common V type and S type in high risk groups; complicated RAS is commonly found in S type during the treatment. And different isoforms have no effect on the CR and DFS rate.

p53 and its isoforms in DNA double-stranded break repair / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

DNA double-stranded break (DSB) is one of the most catastrophic damages of genotoxic insult. Inappropriate repair of DNA DSBs results in the loss of genetic information, mutation, and the generation of harmful genomic rearrangements, which predisposes an organism to immunodeficiency, neurological damage, and cancer. The tumor repressor p53 plays a key role in DNA damage response, and has been found to be mutated in 50% of human cancer. p53, p63, and p73 are three members of the p53 gene family. Recent discoveries have shown that human p53 gene encodes at least 12 isoforms. Different p53 members and isoforms play various roles in orchestrating DNA damage response to maintain genomic integrity. This review briefly explores the functions of p53 and its isoforms in DNA DSB repair.

Expressions of CD97 isoforms in colon cancer tissues and their clinical significances / 肿瘤研究与临床

Objective@#To study the mRNA expressions of various CD97 isoforms in colorectal carcinoma tissues and their clinical significances.@*Methods@#A total of 50 colon cancer patients in the First Affiliated Hospital of Wenzhou Medical University from December 2013 to May 2014 and human colon cancer cell lines SW480 and SW620 were enrolled. The real-time fluorescence quantitative polymerase chain reaction (qRT-PCR) was used to detect the mRNA expressions of CD97 human epidermal growth factor (EGF) (1, 2, 5), CD97EGF (1, 2, 3, 5) and CD97EGF (1, 2, 3, 4, 5) in colon cancer tissues, adjacent tissues, normal colon tissues, SW480 cells and SW620 cells. The relationship between the mRNA expression of CD97EGF (1, 2, 5) and the clinicopathological factors was analyzed.@*Results@#Compared with those low expressions in adjacent tissues and normal tissues, the mRNA expressions of CD97 isoforms CD97EGF (1, 2, 5), CD97EGF (1, 2, 3, 5) and CD97EGF (1, 2, 3, 4, 5) in cancer tissues were highest, and the differences were statistically significant (0.71±0.20 vs. 0.40±0.09 vs. 0.35±0.07, F = 107.642, P < 0.01; 0.45±0.11 vs. 0.26±0.05 vs. 0.27±0.06, F = 94.231, P < 0.01; 0.41±0.10 vs. 0.21±0.05 vs. 0.19±0.03, F = 165.672, P < 0.01). In addition, the mRNA expression of CD97EGF (1, 2, 5) in colon cancer patients was associated with tumor infiltration depth (T1-T2 and T3-T4), clinical stages (Ⅰ-Ⅱ and Ⅲ-Ⅳ), and the differences were statistically significant (t = -2.582, P = 0.013; t = -5.062, P < 0.01). The mRNA expression of CD97EGF (1, 2, 5) in SW620 cells was higher than that in SW480 cells.@*Conclusions@#CD97 isoforms are highly expressed in colon cancer tissues, and CD97EGF (1, 2, 5) may play an important role in the development and invasion of colon cancer. The CD97 isoforms may be new markers in the treatment of colon cancer.

Expressions of CD97 isoforms in colon cancer tissues and their clinical significances / 肿瘤研究与临床

Objective To study the mRNA expressions of various CD97 isoforms in colorectal carcinoma tissues and their clinical significances. Methods A total of 50 colon cancer patients in the First Affiliated Hospital of Wenzhou Medical University from December 2013 to May 2014 and human colon cancer cell lines SW480 and SW620 were enrolled. The real-time fluorescence quantitative polymerase chain reaction (qRT-PCR) was used to detect the mRNA expressions of CD97 human epidermal growth factor (EGF) (1, 2, 5), CD97EGF (1, 2, 3, 5) and CD97EGF (1, 2, 3, 4, 5) in colon cancer tissues, adjacent tissues, normal colon tissues, SW480 cells and SW620 cells. The relationship between the mRNA expression of CD97EGF (1, 2, 5) and the clinicopathological factors was analyzed. Results Compared with those low expressions in adjacent tissues and normal tissues, the mRNA expressions of CD97 isoforms CD97EGF (1, 2, 5), CD97EGF (1, 2, 3, 5) and CD97EGF (1, 2, 3, 4, 5) in cancer tissues were highest, and the differences were statistically significant (0.71±0.20 vs. 0.40±0.09 vs. 0.35±0.07, F=107.642, P<0.01;0.45±0.11 vs. 0.26±0.05 vs. 0.27±0.06, F=94.231, P< 0.01; 0.41±0.10 vs. 0.21±0.05 vs. 0.19±0.03, F= 165.672, P< 0.01). In addition, the mRNA expression of CD97EGF (1, 2, 5) in colon cancer patients was associated with tumor infiltration depth (T1-T2 and T3-T4), clinical stages (Ⅰ-Ⅱ and Ⅲ-Ⅳ), and the differences were statistically significant (t= -2.582, P= 0.013; t= -5.062, P< 0.01). The mRNA expression of CD97EGF (1, 2, 5) in SW620 cells was higher than that in SW480 cells. Conclusions CD97 isoforms are highly expressed in colon cancer tissues, and CD97EGF (1, 2, 5) may play an important role in the development and invasion of colon cancer. The CD97 isoforms may be new markers in the treatment of colon cancer.

Dexamethasone Downregulates Expressions of 14-3-3β and γ-Isoforms in Mice with Eosinophilic Meningitis Caused by Angiostrongylus cantonensis Infection

Steroids are commonly used in patients with eosinophilic meningitis caused by A. cantonensis infections. The mechanism steroids act on eosinophilic meningitis remains unclear. In this mouse experiments, expressions of 14-3-3 isoform β and γ proteins significantly increased in the CSF 2–3 weeks after the infection, but not increasedin the dexamethasone-treated group. Expression of 14-3-3 β, γ, ɛ, and θ isoforms increased in brain meninges over the 3-week period after infection and decreased due to dexamethasone treatment. In conclusion, administration of dexamethasone in mice with eosinophilic meningitis decreased expressions of 14-3-3 isoform proteins in the CSF and in brain meninges.

p53 and its isoforms in DNA double-stranded break repair / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

DNA double-stranded break (DSB) is one of the most catastrophic damages of genotoxic insult. Inappropriate repair of DNA DSBs results in the loss of genetic information, mutation, and the generation of harmful genomic rearrangements, which predisposes an organism to immunodeficiency, neurological damage, and cancer. The tumor repressor p53 plays a key role in DNA damage response, and has been found to be mutated in 50% of human cancer. p53, p63, and p73 are three members of the p53 gene family. Recent discoveries have shown that human p53 gene encodes at least 12 isoforms. Different p53 members and isoforms play various roles in orchestrating DNA damage response to maintain genomic integrity. This review briefly explores the functions of p53 and its isoforms in DNA DSB repair.

Characterization and Biological Activity Analysis of Disulfide Isoforms of Panitumumab / 中国药学杂志

OBJECTIVE: To establish the methods of characterizing and enriching the disulfide isoforms of panitumumab which is a human IgG2 mAb that has been used in the treatment of metastatic colorectal cancer (mCRC) and evaluate the biological activity difference among the isoforms, ie, IgG2-A, IgG2-B, and IgG2-A/B. METHODS: The disulfide isoforms of panitumumab were identified by reversed-phase chromatography. The isoform-A of panitumumab was enriched upon reduction-oxidation treatment when guanidine was added and isoform-B was enriched upon reduction-oxidation treatment without guanidine. Then the molecule structural difference of the isoform-A and isoform-B was analyzed by size-exclusion chromatography. At last, the biological activities of these isoforms were further investigated by cell-killing assay. RESULTS: The component proportions of isoform A, B and A/B in panitumumab were 38%, 32% and 30%, respectively. Under reduction-oxidation conditions, the disulfide isoforms converted to isoform-A when 0.9 mol•L-1 guanidine was used, whereas isoform-B was enriched in the absence of guanidine. And isoform-A was eluted earlier in SECHPLC, suggesting a larger apparent molecular size as compared with isoform-B. Furthermore, the in vitro biological activity measurement showed an increased activity of IgG2-A compared with IgG2-B in inhibiting the growth of DiFi cells. The IC50 s for IgG2-A and IgG2-B were 0.095 46 μg•mL-1 (95% CI 0.079 86 - 0.114 1 μg•mL-1) and 0.372 8 μg•mL-1 (95% CI 0.306 7-0.453 1 μg•mL- 1), respectively. CONCLUSION: The methods for characterizing and enriching the disulfide isoforms are established. Difference in the biological activity between isform-A and isoform-B is observed. The methods will provide technical assist to the process optimization and quality control of panitumumab.

Estimation of the Degree of Salivary Acidification of Recombinant-Human-Erythropoietin(rhEPO) / 中国药学杂志

OBJECTIVE: To detect and analyze the degree of salivary acidification of rhEPO isoforms. METHODS: The isoelectric points of rhEPO isoforms were determined with full column imaging capillary isoelectric focusing electrophoresis. And the charge distribution among rhEPO isoforms was analyzed. The degrees of rhEPO's total saliva acidification were measured using the method of appendices of Chinese Pharmacopoeia. At last, the degrees of saliva acidification of rhEPO isoforms were obtained using multivariate linear fitting. RESULTS: Nine kinds of rhEPO isoforms were distinguished and defined as isoform 1 to 9 with isoelectric points in the range of 3.6 to 5.1. There was one sialic acid molecule between two contiguous rhEPO isoform. Furthermore, the degrees of salivary acidification of the main four kinds of isoforms, 4-7, were 13, 12, 11 and 10 mol/mol, respectively. CONCLUSION :This study lays foundation for rhEPO biosimilar evaluation and further analysis of each isoform of rhEPO.

Calponin Isoforms and Biological Functions / 现代生物医学进展

Calponin is an actin filament-associated regulatory protein expressed in smooth muscle and many types ofnonmuscle cells.Three calponin isoforms 1,2,and 3 are encoded by three homologous genes CNN1,CNN2 and CNN3 in vertebrate species with cell type-specific expression and functions.Besides modulating the activity of smooth muscle myofilaments and contractility,calponin also regulates the functions of actin cytoskeleton in non-muscle cells during cell proliferation,adhesion,migration,differentiation,phagocytosis and fusion.This review focuses on the evolution,tissue and cell type-specific expression,structure-function relationships,transcriptional regulation and relevant mechanisms.

Expression, Purification and Functional Assessment of Smallest Isoform of Human Interleukin-24 in Escherichia coli

ABSTRACT Interleukin-24 (IL-24) is a novel tumor-suppressor gene that has different alternative splice isoforms. It has been shown that new smallest isoform of human IL-24 gene, lacking three exons, induces higher levels of cytotoxicity than all the isoforms, indicating shortest isoform of IL-24 may be a new promising anti-cancer agent. In this study, we aimed to provide a reproducible method for recombinant production of the smallest isoform of IL-24 (sIL-24). The Structure of sIL-24 was analyzed using bioinformatics tools (I-TASSER, Prosa, RAMPAGE and SPDBV version 4.1). The DNA sequence encoding sIL-24 was chemically synthesized and sub-cloned into the pET-32a (+) vector for further protein expression in Escherichia coli BL21 (DE3) strain. Upon IPTG induction, sIL-24 peptide was expressed as a thioredoxin fusion protein. The recombinant sIL-24 was released from the fusion by TEV protease cleavage followed by nickel affinity chromatography. The yield of the purified sIL-24 was estimated about 380 μg/ml. MTT assay showed that sIL-24 peptide inhibited the proliferation of PC-3 cancer cells more effectively than full length IL-24 protein, while none affect the survival of MRC-5 normal cells. These results indicate that the presented expression system is an efficient system for the production of small functional recombinant sIL-24 peptide.This functional peptide may have cancer therapeutic application.