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Real time monitoring of bioreactor mAb IgG3 cell culture process dynamics via Fourier transform infrared

Huiquan Wu, Erik Read, Maury White, Brittany Chavez, Kurt Brorson, Cyrus Agarabi, Mansoor Khan

《化学科学与工程前沿(英文)》 2015年 第9卷 第3期   页码 386-406 doi: 10.1007/s11705-015-1533-3

摘要: Compared to small molecule process analytical technology (PAT) applications, biotechnology product PAT applications have certain unique challenges and opportunities. Understanding process dynamics of bioreactor cell culture process is essential to establish an appropriate process control strategy for biotechnology product PAT applications. Inline spectroscopic techniques for real time monitoring of bioreactor cell culture process have the distinct potential to develop PAT approaches in manufacturing biotechnology drug products. However, the use of inline Fourier transform infrared (FTIR) spectroscopic techniques for bioreactor cell culture process monitoring has not been reported. In this work, real time inline FTIR Spectroscopy was applied to a lab scale bioreactor mAb IgG3 cell culture fluid biomolecular dynamic model. The technical feasibility of using FTIR Spectroscopy for real time tracking and monitoring four key cell culture metabolites (including glucose, glutamine, lactate, and ammonia) and protein yield at increasing levels of complexity (simple binary system, fully formulated media, actual bioreactor cell culture process) was evaluated via a stepwise approach. The FTIR fingerprints of the key metabolites were identified. The multivariate partial least squares (PLS) calibration models were established to correlate the process FTIR spectra with the concentrations of key metabolites and protein yield of in-process samples, either individually for each metabolite and protein or globally for all four metabolites simultaneously. Applying the 2 derivative pre-processing algorithm to the FTIR spectra helps to reduce the number of PLS latent variables needed significantly and thus simplify the interpretation of the PLS models. The validated PLS models show promise in predicting the concentration profiles of glucose, glutamine, lactate, and ammonia and protein yield over the course of the bioreactor cell culture process. Therefore, this work demonstrated the technical feasibility of real time monitoring of the bioreactor cell culture process via FTIR spectroscopy. Its implications for enabling cell culture PAT were discussed.

关键词: process analytical technology (PAT)     Fourier-transform infrared (FTIR) spectroscopy     partial least squares (PLS) regression     mouse IgG3     bioreactor cell culture process     real time process monitoring    

Antitumor immunity of human SART3 gene vaccine against mouse tumor

HE Yu, YANG Shuhua, LIU Yong, LI Tao

《医学前沿(英文)》 2008年 第2卷 第1期   页码 51-57 doi: 10.1007/s11684-008-0010-5

摘要: To determine whether squamous cell carcinoma antigen recognized by human T cell 3 (SART3) gene can induce antitumor immunity against tumor cells which express the gene, we constructed mouse tumor cells expressing human SART3 (LM8-SART3) and carried out experiments . After subcutaneous injection with SART3 gene vaccine, cytotoxic T lymphocyte (CTL) activity was measured using Cell Counting Kit-8. As for the part, C3H mice were divided into several groups. One group was challenged with tumor cells after immunity. Another group was treated with the vaccine after tumor implantation. It was found that human SART3 DNA vaccine can elicit a specific CTL reaction from the mouse splenocytes. After vaccination, tumor occurrence and tumor growth speed was reduced. The vaccine also shows activity in tumor treatment. We conclude that the human SART3 DNA vaccine can induce antitumor ability against tumor cells expressing human SART3 (LM8-SART3) which may provide new possibilities in antitumor therapy.

关键词: antitumor therapy     occurrence     implantation     DNA vaccine     SART3 DNA    

Control of lupus activity during pregnancy via the engagement of IgG sialylation: novel crosstalk betweenIgG sialylation and pDC functions

《医学前沿(英文)》 2023年 第17卷 第3期   页码 549-561 doi: 10.1007/s11684-022-0965-7

摘要: Immunoglobulin (IgG) glycosylation affects the effector functions of IgG in a myriad of biological processes and has been closely associated with numerous autoimmune diseases, including systemic lupus erythematosus (SLE), thus underlining the pathogenic role of glycosylation aberration in autoimmunity. This study aims to explore the relationship between IgG sialylation patterns and lupus pregnancy. Relative to that in serum samples from the control cohort, IgG sialylation level was aberrantly downregulated in serum samples from the SLE cohort at four stages (from preconception to the third trimester of pregnancy) and was significantly associated with lupus activity and fetal loss during lupus pregnancy. The type I interferon signature of pregnant patients with SLE was negatively correlated with the level of IgG sialylation. The lack of sialylation dampened the ability of IgG to suppress the functions of plasmacytoid dendritic cells (pDCs). RNA-seq analysis further revealed that the expression of genes associated with the spleen tyrosine kinase (SYK) signaling pathway significantly differed between IgG- and deSia-IgG-treated pDCs. This finding was confirmed by the attenuation of the ability to phosphorylate SYK and BLNK in deSia-IgG. Finally, the coculture of pDCs isolated from pregnant patients with SLE with IgG/deSia-IgG demonstrated the sialylation-dependent anti-inflammatory function of IgG. Our findings suggested that IgG influences lupus activity through regulating pDCs function via the modulation of the SYK pathway in a sialic acid-dependent manner.

关键词: pregnancy     IgG glycome     type I interferon     systemic lupus erythematosus    

Recombinant protein diannexin prevents preeclampsia-like symptoms in a pregnant mouse model via reducing

《医学前沿(英文)》 2022年 第16卷 第6期   页码 919-931 doi: 10.1007/s11684-021-0918-6

摘要: Preeclampsia (PE) is characterized by placenta-mediated pregnancy complication. The only effective treatment for PE is the delivery of the placenta. However, this treatment may cause preterm birth and neonatal death. Therefore, preventing PE is needed. The mechanism of PE involves abnormal placentation, which leads to the release of anti-angiogenic and inflammatory mediators into maternal circulation. These mediators contribute to systemic vascular dysfunction, inflammatory responses, and excessive thrombin generation. Microparticles (MPs) are reportedly involved in PE by promoting the thromboinflammatory response. This study describes a strategy to prevent PE by reducing MP release using the recombinant protein, diannexin. Results showed that the patients with PE had elevated MP number and procoagulant activity and increased NLRP3 inflammasome activation. Additionally, diannexin remarkably reduced the release of MPs from activated cells by binding to phosphatidylserine exposed on the surface of activated cells. Moreover, in vivo results showed that diannexin could prevent PE-like symptoms by decreasing MPs and NLRP3 inflammasome activation in pregnant mice. Furthermore, diannexin effectively inhibited trophoblast cell activation and NLRP3 inflammasome activation in vitro. These findings suggested that diannexin inhibited MP release and might be an effective therapeutic strategy for preventing PE.

关键词: preeclampsia     recombinant protein diannexin     microparticle     NLRP3 inflammasome     phosphatidylserin    

Chemotactic effect of urokinase-type plasminogen activator on mouse spermatozoa

DING Xiaofang, LI Honggang, XIONG Chengliang

《医学前沿(英文)》 2008年 第2卷 第2期   页码 195-199 doi: 10.1007/s11684-008-0037-7

摘要: The aim of this study is to investigate the chemotactic effect of urokinase-type plasminogen activator (uPA) on mouse spermatozoa. Capillary assays were applied to study the chemotactic activity of ascending and descending gradients of uPA. Firstly, the chemotactic effect of an ascending gradient of uPA on mouse spermatozoa was observed by counting the number of spermatozoa that migrated into the capillary after incubation with uPA for 5, 10, 20, and 30 min, respectively, compared with that after incubation with F10. Twenty minutes was a suitable incubation time to obtain a plateau of sperm accumulation. Meanwhile, to confirm the specific effect of uPA on mouse sperm chemotaxis, uPA inhibitor (PAI-1) and anti-uPAR rabbit IgG were added to the test solution containing 20 U/mL uPA, respectively. To exclude the possibility that PAI-1 and anti-uPAR rabbit IgG may affect sperm accumulation nonspecifically, PAI-1 and anti-uPAR rabbit IgG were added to F10, respectively. It was found that the chemotactic effect of uPA was neutralized completely by PAI-1 and anti-uPAR rabbit IgG. PAI-1 and anti-uPAR rabbit IgG had no neutralizing effect on the sperm chemotactic effect. Lastly, the sperm chemotaxis response to a descending gradient of uPA was also observed. Taken together, the results suggest that uPA can induce sperm chemotaxis by binding to its receptor on the sperm membrane and may act as a chemoattractant in precontacting sperm-egg communication thereby increasing the chance encounter of spermatozoa and eggs.

关键词: chemotactic activity     receptor     uPA inhibitor     F10     chemoattractant    

Proteomics study of Mycoplasma pneumoniae pneumonia reveals the Fc fragment of the IgG-binding protein

《医学前沿(英文)》 2022年 第16卷 第3期   页码 378-388 doi: 10.1007/s11684-021-0840-y

摘要: Macrolide and corticosteroid resistance has been reported in patients with Mycoplasma pneumoniae (MP) pneumonia (MPP). MP clearance is difficult to achieve through antibiotic treatment in sensitive patients with severe MPP (SMPP). SMPP in children might progress to airway remodeling and even bronchiolitis/bronchitis obliterans. Therefore, identifying serum biomarkers that indicate MPP progression and exploring new targeted drugs for SMPP treatment require urgency. In this study, serum samples were collected from patients with general MPP (GMPP) and SMPP to conduct proteomics profiling. The Fc fragment of the IgG-binding protein (FCGBP) was identified as the most promising indicator of SMPP. Biological enrichment analysis indicated uncontrolled inflammation in SMPP. ELISA results proved that the FCGBP level in patients with SMPP was substantially higher than that in patients with GMPP. Furthermore, the FCGBP levels showed a decreasing trend in patients with GMPP but the opposite trend in patients with SMPP during disease progression. Connectivity map analyses identified 25 possible targeted drugs for SMPP treatment. Among them, a mechanistic target of rapamycin kinase (mTOR) inhibitor, which is a macrolide compound and a cell proliferation inhibitor, was the most promising candidate for targeting SMPP. To our knowledge, this study was the first proteomics-based characterization of patients with SMPP and GMPP.

关键词: severe Mycoplasma pneumoniae pneumonia     children     proteomics     Fc fragment of the IgG-binding protein     mechanistic target of rapamycin kinase inhibitor    

High-level expression of recombinant IgG1 by CHO K1 platform

Ningning Xu, Jianfa Ou, Al-Karim (Al) Gilani, Lufang Zhou, Margaret Liu

《化学科学与工程前沿(英文)》 2015年 第9卷 第3期   页码 376-380 doi: 10.1007/s11705-015-1531-5

摘要: The Chinese Hamster Ovary (CHO K1) cell was used to express a targeted anti-cancer monoclonal antibody by optimizing the platform of the construction of production cell line in this study. The adherent CHO K1 was first adapted to suspension culture in chemical defined medium. Then the glutamine synthetase (GS) vector was applied to construct a single plasmid to overexpress a monoclonal antibody IgG1. Post transfection, the production of cell pool was optimized by glutamine-free selection and amplification using various concentrations of methionine sulfoximine. The best cell pool of CHO K1/IgG1 was used to screen the top single clone using the limiting dilution cloning. Finally, a high IgG1 production of 780 mg/L was obtained from a batch culture. This study demonstrated that the construction of high producing cell line, from gene to clone, could be completed within six month and the gene amplification improved protein production greatly.

关键词: Chinese hamster ovary (CHO)     monoclonal antibody     IgG1     amplification     cell line development    

R158Q and G212S, novel pathogenic compound heterozygous variants in of Gitelman syndrome

《医学前沿(英文)》 2022年 第16卷 第6期   页码 932-945 doi: 10.1007/s11684-022-0963-9

摘要: The dysfunction of Na+-Cl cotransporter (NCC) caused by mutations in solute carrier family12, member 3 gene (SLC12A3) primarily causes Gitelman syndrome (GS). In identifying the pathogenicity of R158Q and G212S variants of SLC12A3, we evaluated the pathogenicity by bioinformatic, expression, and localization analysis of two variants from a patient in our cohort. The prediction of mutant protein showed that p.R158Q and p.G212S could alter protein’s three-dimensional structure. Western blot showed a decrease of mutant Ncc. Immunofluorescence of the two mutations revealed a diffuse positive staining below the plasma membrane. Meanwhile, we conducted a compound heterozygous model—Ncc R156Q/G210S mice corresponding to human NCC R158Q/G212S. NccR156Q/G210S mice clearly exhibited typical GS features, including hypokalemia, hypomagnesemia, and increased fractional excretion of K+ and Mg2+ with a normal blood pressure level, which made NccR156Q/G210S mice an optimal mouse model for further study of GS. A dramatic decrease and abnormal localization of the mutant Ncc in distal convoluted tubules contributed to the phenotype. The hydrochlorothiazide test showed a loss of function of mutant Ncc in NccR156Q/G210S mice. These findings indicated that R158Q and G212S variants of SLC12A3 were pathogenic variants of GS.

关键词: Gitelman syndrome     mouse model     compound heterozygous     hypokalemia     Slc12a3    

Novel lysosome-targeted anticancer fluorescent agents used in zebrafish and nude mouse tumour imaging

《化学科学与工程前沿(英文)》 2022年 第16卷 第1期   页码 112-120 doi: 10.1007/s11705-021-2075-5

摘要: The design of three novel fatty nitrogen mustard-based anticancer agents with fluorophores incorporated into the alkene structure (CXL 118, CXL121, and CXL122) is described in this report. The results indicated that these compounds are selectively located in lysosomes and exhibit effective antitumour activity. Notably, these compounds can directly serve as both reporting and imaging agents in vitro and in vivo without the need to add other fluorescent tagging agents.

关键词: fluorescent drug     lysosomal     anticancer     zebrafish     nude-mouse tumour imaging    

Lack of CFAP54 causes primary ciliary dyskinesia in a mouse model and human patients

《医学前沿(英文)》 doi: 10.1007/s11684-023-0997-7

摘要: Primary ciliary dyskinesia (PCD) is a highly heterogeneous recessive inherited disorder. FAP54, the homolog of CFAP54 in Chlamydomonas reinhardtii, was previously demonstrated as the C1d projection of the central microtubule apparatus of flagella. A Cfap54 knockout mouse model was then reported to have PCD-relevant phenotypes. Through whole-exome sequencing, compound heterozygous variants c.2649_2657delinC (p. E883Dfs*47) and c.7312_7313insCGCAGGCTGAATTCTTGG (p. T2438delinsTQAEFLA) in a new suspected PCD-relevant gene, CFAP54, were identified in an individual with PCD. Two missense variants, c.4112A>C (p. E1371A) and c.6559C>T (p. P2187S), in CFAP54 were detected in another unrelated patient. In this study, a minigene assay was conducted on the frameshift mutation showing a reduction in mRNA expression. In addition, a CFAP54 in-frame variant knock-in mouse model was established, which recapitulated the typical symptoms of PCD, including hydrocephalus, infertility, and mucus accumulation in nasal sinuses. Correspondingly, two missense variants were deleterious, with a dramatic reduction in mRNA abundance from bronchial tissue and sperm. The identification of PCD-causing variants of CFAP54 in two unrelated patients with PCD for the first time provides strong supportive evidence that CFAP54 is a new PCD-causing gene. This study further helps expand the disease-associated gene spectrum and improve genetic testing for PCD diagnosis in the future.

关键词: primary ciliary dyskinesia     CFAP54     cilia    

IgG N-糖基心血管年龄独立于真实年龄精准表征心血管事件风险 Article

武志远, 郭政, 郑雨露, 王玉涛, 张海平, 潘慧颖, 李志伟, Lois Balmer, 李霞, 陶丽新, 郭秀花, 王嵬

《工程(英文)》 2023年 第26卷 第7期   页码 99-107 doi: 10.1016/j.eng.2022.12.004

摘要:

亚临床动脉粥样硬化和代谢紊乱是心血管健康的重要风险因素,应用免疫球蛋白G(IgGN-聚糖模式作为炎症指标表征其发病风险已有研究报道然而,对于IgG N-糖基谱在心血管疾病(CVD)风险分层中的能力仍然未知。本研究旨在利用IgG N-糖基标志物开发追踪心血管疾病风险的年龄指数。使用机器学习递归特征消除和惩罚回归算法逐步筛选特征糖基,并开发IgG N-糖基化心血管年龄(GlyCage)指数,以反映归因于心血管风险的与真实年龄间的偏差。因此,本研究开发的GlyCage指数利用IgG N-糖基谱追踪心血管健康水平。GlyCage和真实年龄之间的差距能够独立地表征心血管风险,提示IgG N-糖基化在心血管疾病的发病机制中起作用。

关键词: IgG     N-糖基心血管年龄     心血管年龄     免疫球蛋白G     糖基化     炎症     特征选择     机器学习    

MiRNA-451 is a potential biomarker for estrogenicity in mouse uterus

Lingyan HOU, Yun LU, Ying LI, Li LI

《环境科学与工程前沿(英文)》 2014年 第8卷 第1期   页码 99-105 doi: 10.1007/s11783-013-0490-7

摘要: The uterotrophic assay has been commonly used to test environmental estrogens in vivo, however, it is often not sensitive enough sometimes. An alternative way is to evaluate estrogenicity through biomarker genes. MicroRNA (miRNA) is a class of regulatory gene, which has been shown to be a good biomarker for many diseases and toxicological effects in recent years, and some evidences showed that estrogen induced response was partially mediated by miRNAs. In this study, two types of microarrays were used to test the 17β-estradiol (E2) induced miRNA expression profile at different time points in the immature mouse uterus. Statistical analysis showed the aldehyde slide based array had less variation than the amino slide based array, and 11 dysregulated miRNAs were screened out for significant fold change. Real-time PCR was performed to further confirm that 4 out of 7 selected miRNAs, namely miR-451, miR-155, miR-335-5p, and miR-365, are E2 regulated miRNAs in the uterus. The function of the predicted targets of these miRNAs is involved in cell grow control, which is consistent with the main E2 function in the uterus. MiR-451 had similar strong responses to E2 in the uterus of both immature and overiectomized mice, and could be a potential biomarker for estrogenicity in the uterus.

关键词: estrogen     microRNA (miRNA)     microarray     biomarker    

Molecular dynamic simulation on the conformation of mouse muscle type nAChR

Shengai SUN, Rilei YU, Yanhui ZHANG, Yanni LI,

《化学科学与工程前沿(英文)》 2010年 第4卷 第3期   页码 348-352 doi: 10.1007/s11705-009-0284-4

摘要: A mouse muscle type nAChR model ((α1)βδγ) was built based on the cryoelectron microscopic structure of intact nAChR and the high resolution crystal structure of nAChR-α1 subunit. The conformation of the pentameric nAChR model was investigated by molecular dynamic simulation. The function of water molecule in the hydrophilic interior was clarified. The reason for Tyr127 showing two alternative conformations was discussed in detail.

关键词: pentameric     hydrophilic     Tyr127     cryoelectron microscopic     conformation    

Spatiotemporal expression of Ezh2 in the developing mouse cochlear sensory epithelium

null

《医学前沿(英文)》 2016年 第10卷 第3期   页码 330-335 doi: 10.1007/s11684-016-0459-6

摘要:

The enhancer of zeste 2 polycomb repressive complex 2 subunit (Ezh2) is a histone-lysine N-methyltransferase enzyme that participates in DNA methylation. Ezh2 has also been reported to play crucial roles in stem cell proliferation and differentiation. However, the detailed expression profile of Ezh2 during mouse cochlear development has not been investigated. Here, we examined the spatiotemporal expression of Ezh2 in the cochlea during embryonic and postnatal development. Ezh2 expression began to be observed in the whole otocyst nuclei at embryonic day 9.5 (E9.5). At E12.5, Ezh2 was expressed in the nuclei of the cochlear prosensory epithelium. At E13.5 and E15.5, Ezh2 was expressed from the apical to the basal turns in the nuclei of the differentiating cochlear epithelium. At postnatal day (P) 0 and 7, the Ezh2 expression was located in the nuclei of the cochlear epithelium in all three turns and could be clearly seen in outer and inner hair cells, supporting cells, the stria vascularis, and spiral ganglion cells. Ezh2 continued to be expressed in the cochlear epithelium of adult mice. Our results provide the basic Ezh2 expression pattern and might be useful for further investigating the detailed role of Ezh2 during cochlear development.

关键词: polycomb repressive complex     Ezh2     expression     inner ear     cochlea     development    

Construction of lentiviral vector carrying Rab9 gene and its expression in mouse brain

Youguo HAO, Min ZHANG, Jinzhi XU, Bitao BU, Jiajun WEI

《医学前沿(英文)》 2009年 第3卷 第2期   页码 141-147 doi: 10.1007/s11684-009-0041-6

摘要: Rab proteins and their effectors facilitate vesicular transport by tethering donor vesicles to their respective target membranes. Rab9 mediates late endosome-to- -Golgi-network trafficking. To explore the possibility of Rab9-related gene therapy for neurodegenerative diseases, we packed Lentivirus encoding Rab9. The expressing plasmid pCDH1-MCF1-Rab9-EF1-copGFP was constructed by using molecular biological techniques. The Lentivirus encoding Rab9 cDNA was packed by Lifectamine-2000 mediated co-transfection of the plasmid pPACKH1- , pPACKH1- and pVSV- into 293T cells. DNA sequencing proved the successful construction of pCDH1-MCF1-Rab9-EF1-copGFP. After 72 hours, the expression of GFP could be detected in BV-2 cells. Western blotting revealed that the Rab9 gene expression in BALB/c mice brain was up-regulated significantly 4 weeks after injection with Lentivirus encoding Rab9, which evidenced a satisfactory increasing effect of this virus. Administration of Lenti-Rab9 to postnatal day 3 Niemann-Pick disease type C (NPC) mice reduced motor defects and prevented the weight loss associated with female NPC mice, as well as modulating the death rate of Purkinje neurons. It is concluded that the packaging of Lentivirus encoding Rab9 was successful. Lentivirus encoding Rab9 can increase the expression of Rab9 gene effectively, which might offer a novel means for the treatment of neurodegenerative diseases.

关键词: Rab9     lentivirus     gene therapy     gene transfer    

标题 作者 时间 类型 操作

Real time monitoring of bioreactor mAb IgG3 cell culture process dynamics via Fourier transform infrared

Huiquan Wu, Erik Read, Maury White, Brittany Chavez, Kurt Brorson, Cyrus Agarabi, Mansoor Khan

期刊论文

Antitumor immunity of human SART3 gene vaccine against mouse tumor

HE Yu, YANG Shuhua, LIU Yong, LI Tao

期刊论文

Control of lupus activity during pregnancy via the engagement of IgG sialylation: novel crosstalk betweenIgG sialylation and pDC functions

期刊论文

Recombinant protein diannexin prevents preeclampsia-like symptoms in a pregnant mouse model via reducing

期刊论文

Chemotactic effect of urokinase-type plasminogen activator on mouse spermatozoa

DING Xiaofang, LI Honggang, XIONG Chengliang

期刊论文

Proteomics study of Mycoplasma pneumoniae pneumonia reveals the Fc fragment of the IgG-binding protein

期刊论文

High-level expression of recombinant IgG1 by CHO K1 platform

Ningning Xu, Jianfa Ou, Al-Karim (Al) Gilani, Lufang Zhou, Margaret Liu

期刊论文

R158Q and G212S, novel pathogenic compound heterozygous variants in of Gitelman syndrome

期刊论文

Novel lysosome-targeted anticancer fluorescent agents used in zebrafish and nude mouse tumour imaging

期刊论文

Lack of CFAP54 causes primary ciliary dyskinesia in a mouse model and human patients

期刊论文

IgG N-糖基心血管年龄独立于真实年龄精准表征心血管事件风险

武志远, 郭政, 郑雨露, 王玉涛, 张海平, 潘慧颖, 李志伟, Lois Balmer, 李霞, 陶丽新, 郭秀花, 王嵬

期刊论文

MiRNA-451 is a potential biomarker for estrogenicity in mouse uterus

Lingyan HOU, Yun LU, Ying LI, Li LI

期刊论文

Molecular dynamic simulation on the conformation of mouse muscle type nAChR

Shengai SUN, Rilei YU, Yanhui ZHANG, Yanni LI,

期刊论文

Spatiotemporal expression of Ezh2 in the developing mouse cochlear sensory epithelium

null

期刊论文

Construction of lentiviral vector carrying Rab9 gene and its expression in mouse brain

Youguo HAO, Min ZHANG, Jinzhi XU, Bitao BU, Jiajun WEI

期刊论文