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Qin LH, Chen L, Cao X, Huang TJ, Li ZY, Li S, Wang GZ. The identification of sex-specific biomarkers in peripheral blood mononuclear cells from elderly individuals with ischemic stroke. Eur Rev Med Pharmacol Sci 2023; 27:6496-6509. [PMID: 37522661 DOI: 10.26355/eurrev_202307_33120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
OBJECTIVE The aim of this study was to identify sex-specific biomarkers for ischemic stroke (IS) prophylaxis in elderly individuals. MATERIALS AND METHODS The GSE22255 dataset for elderly individuals with IS was retrieved from the gene expression omnibus database. Thereafter, gene ontology and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses were performed, as well as gene set enrichment analysis (GSEA). Furthermore, protein-protein interactions (PPIs) were explored using the STRING database, and to screen central genes from the Cytoscape PPI network, corresponding to peripheral blood samples from elderly individuals, we used the molecular complex detection plug-in and cytoHubba. Moreover, a Venn diagram was used to visualize the key genes common among elderly women and men with IS. Statistical analysis was also performed, and receiver operating characteristic (ROC) curves were constructed to evaluate the specificity and sensitivity of the prediction of IS in the elderly. RESULTS Compared with the healthy controls, in elderly women with IS, 511 biological process (BP) terms, 16 molecular function (MF) terms, and 34 KEGG terms were significantly enriched, whereas in the elderly men with IS, 681 BP terms, 12 MF terms, and 44 KEGG terms were enriched. The GSEA revealed 99 and 140 significantly enriched gene sets in elderly women and men with IS, respectively. Furthermore, in the PPI network, 10 hub genes for each sex with high specificity and sensitivity were identified using ROC curves. CONCLUSIONS Ten genes for each sex with significant differential expression were also identified in individuals with IS. The novel sex-specific gene targets may be promising diagnostic or prognostic markers and potential therapeutic targets for IS in the elderly.
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Affiliation(s)
- L-H Qin
- School of Nursing, Hunan University of Chinese Medicine, Changsha, China.
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Xiao ZW, Liu Y, Li ZY, Li S, Qin LH. Molecular mechanism of Tongmai Yangxin Pill intervention in elderly patients with coronary heart disease. Eur Rev Med Pharmacol Sci 2022; 26:8265-8275. [PMID: 36459010 DOI: 10.26355/eurrev_202211_30359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
OBJECTIVE The Tongmai Yangxin Pill (TMYX) is considered an effective treatment for coronary heart disease (CHD). However, its mechanism is unclear. This study aimed at exploring the molecular mechanisms and key genes of the TMYX in the treatment of CHD. MATERIALS AND METHODS Differentially expressed genes (DEGs) in the GSE142008 dataset were screened with the R software, and Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses were performed. Then, protein-protein interactions were analyzed using the Search Tool for the Retrieval of Interacting Genes database. The correlation analysis between key genes was conducted, and gene expression was verified. RESULTS A total of 1,614 DEGs were identified, including 1,591 upregulated and 23 downregulated genes. GO enrichment analysis revealed that 240 biological processes, 44 cellular components, and 23 molecular functions were significantly enriched for DEGs in elderly patients with CHD. Similarly, 36 KEGG terms were significantly enriched for DEGs. Ten key genes were screened, and after verification and analysis, seven key genes (RSL24D1, NMD3, DCAF13, WDR36, SDAD1, KRR1, and RPF1) were identified as significantly overexpressed. CONCLUSIONS We identified seven key genes as candidate biomarkers for TMYX in the treatment of elderly patients with CHD; these results can serve as a theoretical basis for targeted therapy.
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Affiliation(s)
- Z-W Xiao
- Department of Food and Drug Engineering, School of Pharmacy, Key Laboratory of Hunan Province for Prevention and Treatment of Integrated Traditional Chinese and Western Medicine on Cardiocerebral Diseases, School of Nursing, School of Informatics, Hunan University of Chinese Medicine, Hunan, Changsh, P.R. China.
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Li S, Li ZY, Qin LH. Investigating potential ferroptosis-related differentially expressed genes and biomarkers of ischemic stroke in elderly women using bioinformatics. Eur Rev Med Pharmacol Sci 2022; 26:4744-4754. [PMID: 35856366 DOI: 10.26355/eurrev_202207_29199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
OBJECTIVE Women have a higher lifetime risk of stroke than men and are more likely to die from it. Ferroptosis is a recently discovered form of programmed cell death implicated in many diseases. The role of ferroptosis-related genes in the diagnosis, prognosis, and treatment of elderly women with ischemic stroke (IS) requires additional clarification. This paper aimed to screen ferroptosis-related genes associated with IS in elderly women and to identify hub genes and candidate drugs. MATERIALS AND METHODS Ferroptosis-related differentially expressed genes (DEGs) in elderly women with IS were identified by bioinformatics analysis of the GSE22255 and ferroptosis-related gene datasets. Subsequently, ferroptosis-related hub genes were used to predict targeted miRNA, construct the miRNA-mRNA network, and identify candidate drugs. RESULTS Eleven ferroptosis-related DEGs were identified in elderly women with IS vs. controls. Gene Ontology and Kyoto Encyclopedia of Genes and Genomes analysis revealed that the 11 genes were mainly enriched in the IL-17, TNF, and NF-κB signaling pathways. Moreover, the hub genes suggested 10 ferroptosis-related biomarkers for IS, including SOCS1, IFNG, TNFAIP3, IL1B, IL-6, PTGS2, DDIT3, CXCL2, NFE2L2, and ATF3. Furthermore, our findings revealed the miRNA-mRNA network of the hub genes and identified candidate drugs. 10 potential therapeutic compounds, especially estradiol CTD 00005920, corresponded to the 10 key genes which could be targets for IS treatment in elderly women. CONCLUSIONS Our results suggested ferroptosis-related DEGs (SOCS1, IFNG, TNFAIP3, IL1B, IL-6, PTGS2, DDIT3, CXCL2, NFE2L2, and ATF3) as potential biomarkers for IS diagnosis, prognosis, and treatment, providing additional evidence of the important role of ferroptosis in IS in elderly women.
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Affiliation(s)
- S Li
- School of Informatics, School of Nursing, Key Laboratory of Hunan Province for Prevention and Treatment of Integrated Traditional Chinese and Western Medicine on Cardiocerebral Diseases, Hunan University of Chinese Medicine, Changsha, China.
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Qin LH, Zhu XJ, Zhang LY, Chen JQ, Jin GY, Xiang LJ. Identification of hub genes and pathways in the development of gastric cancer by gene co‑expression network analysis. J BIOL REG HOMEOS AG 2021; 35:35-44. [PMID: 33601878 DOI: 10.23812/20-478-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
There are many risk factors for gastric cancer (GC), including chronic atrophic gastritis, which involves multiple genes and signaling pathways. Weighted gene co-expression network analysis (WGCNA) was performed on GSE111762 to construct free-scale gene co-expression networks and identified four significant modules that consisted of blue, dark orange, dark red and dark violet. In each module, genes with the most connectivity were selected as hub genes, including G antigen 12J (GAGE12J) in blue, proline, histidine and glycine rich 1 (PHGR1) in dark orange, DNA polymerase gamma 2, accessory subunit (POLG2) in dark red and collagen type XXI alpha 1 chain (COL21A1) in dark violet. The transcription level of COL21A1 and GAGE12J was up-regulated in atrophic gastritis vs normal gastric mucosa, but down-regulated in GC vs atrophic gastritis. PHGR1 was consistently down-regulated from normal gastric mucosa to GC, while POLG2 was up-regulated. Gene set enrichment analysis (GSEA) was then conducted to study the biological functions of hub genes in the development of GC. It showed that multiple tumorigenesis-related pathways were enriched, including peroxisome, DNA repair and KRAS signaling pathway in COL21A1, IL6-JAK-STAT3, epithelial mesenchymal transition (EMT) and TNFα-NF-κB signaling pathway in PHGR1, MYC targets, E2F targets and angiogenesis in POLG2 and peroxisome, Notch signaling pathway and androgen response in GAGE12J. The identified four genes, especially for COL21A1, PHGR1 and POLG2, were important in GC tumorigenesis and affected many cancer-related pathways.
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Affiliation(s)
- L H Qin
- Department of Gastroenterology, Shangyu People's Hospital, Shaoxing, Zhejiang, China
| | - X J Zhu
- Department of Gastroenterology, Shangyu People's Hospital, Shaoxing, Zhejiang, China
| | - L Y Zhang
- Department of Gastroenterology, Shangyu People's Hospital, Shaoxing, Zhejiang, China
| | - J Q Chen
- Department of Gastroenterology, Shangyu People's Hospital, Shaoxing, Zhejiang, China
| | - G Y Jin
- Department of Gastroenterology, Shangyu People's Hospital, Shaoxing, Zhejiang, China
| | - L J Xiang
- Department of Gastroenterology, Shangyu People's Hospital, Shaoxing, Zhejiang, China
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Bai Y, Qin LH, Zhang Y, Jiang H, Wang K, Jia J. [Effects of estrogen and remifemin on neuronal nitric oxide synthase and transient receptor potential vanilloid 1 in submandibular gland of ovariectomized rats]. Zhonghua Kou Qiang Yi Xue Za Zhi 2019; 54:188-193. [PMID: 30856697 DOI: 10.3760/cma.j.issn.1002-0098.2019.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effects of estrogen and remifemin on the expression of neuronal nitric oxide synthase (nNOS), transient receptor potential vanilloid 1 (TRPV1), muscarinic acetylcholine receptor, member 1 and 3 (M1 and M3 receptor) and acetylcholinesterase (AChE) in the submandibular gland of rats. Methods: Forty SD female adult rats were divided into SHAM group (sham operation), OVX group (ovarian removal), OVX+E group (ovarian removal + estrogen treatment) and OVX+ICR group (ovarian removal + remifemin treatment), 10 per group. The rats were recovered for 2 weeks after operation. The SHAM group and the OVX group were treated with distilled water, the OVX+E group and the OVX+ICR group were treated with β-estradiol and remifemin respectively. After 4 weeks, the location and expression of nNOS, TRPV1, M1 and M3 receptors in the submandibular gland were evaluated by immunohistochemistry. The changes of AChE expression in rat submandibular gland were observed by AChE staining. Results: Compared with SHAM group (0.23±0.02, 0.28±0.01, 0.25±0.03, 0.19±0.03), the expression of nNOS, TRPV1, M1 and M3 receptors in OVX group (0.16±0.01, 0.21±0.01, 0.15±0.02, 0.09±0.02) were significantly lower (P<0.05); there were no significant difference between OVX+E group (0.23±0.01, 0.28±0.02, 0.23±0.03, 0.19±0.01) and SHAM group (P>0.05). But compared with OVX group, the expression of nNOS, TRPV1 and M3 receptors in OVX+ICR group were no significantly changed (P>0.05), and only M1 receptor expression (0.22±0.03) was significantly increased (P<0.05). The expression of AChE in OVX group (0.14±0.01) was significantly higher than that in SHAM group (0.10±0.01) (P<0.05). The expression of AChE in OVX+E group (0.15±0.01) was significantly higher than that in SHAM group (P<0.05). The expression of AChE in OVX+ICR group (0.09±0.01) was not significantly different from that in SHAM group (P>0.05). Conclusions: Estrogen can significantly increase the expression of nNOS and TRPV1 in the submandibular gland of rats, suggesting that estrogen may regulate the salivary secretion function of the submandibular gland through nNOS and TRPV1. The mechanism of remifemin is different from that of estrogen, and remifemin does not play a regulatory role by nNOS and TRPV1.
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Affiliation(s)
- Y Bai
- Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030001, China
| | - L H Qin
- Department of Anatomy and Histoembryology, School of Basic Medical Science, Peking University, Beijing 100191, China
| | - Y Zhang
- Department of Stomatology, The Third Medical Center, Chinese PLA General Hospital, Beijing 100039, China
| | - H Jiang
- Department of Anatomy and Histoembryology, School of Basic Medical Science, Peking University, Beijing 100191, China
| | - K Wang
- Department of Anatomy and Histoembryology, School of Basic Medical Science, Peking University, Beijing 100191, China
| | - J Jia
- Department of Stomatology, The Third Medical Center, Chinese PLA General Hospital, Beijing 100039, China
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Sun Y, Qin LH, Chen X, Yan X, Mao L, Bai W, Kang J. Effects of black cohosh and estrogen on core body and tail-skin temperatures in ovariectomized rats by telemetric monitoring with dual thermistor probes. Climacteric 2018; 21:153-159. [PMID: 29323578 DOI: 10.1080/13697137.2017.1415320] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVES To investigate the effects of black cohosh and estrogen on the temperature in ovariectomized rats, the core body temperature (CBT) and tail-skin temperature (TST) were simultaneously monitored and the relationship between these two temperatures was explored. METHODS Twenty-four female Sprague-Dawley rats aged 8 weeks were randomly divided into four groups: sham-operated (SHAM), ovariectomized (OVX), OVX treated with estradiol valerate (OVX + E), and OVX treated with isopropanolic black cohosh extract (OVX + ICR). Rats were sham-operated or ovariectomized and were implanted with telemetry transmitters with dual thermistor probes. Two weeks after surgery, the animals were treated with drugs for 4 weeks. During the last week of the treatments, the dynamic temperature profiles of the CBT and TST were collected. RESULTS The average CBT and TST, TST fluctuation frequency, and the average amplitude fluctuation were significantly higher in OVX than in SHAM rats. In addition, dramatic fluctuations of TST in OVX rats occurred at the time points of the day when the CBTs were lower in OVX rats than in SHAM rats. Treatment of OVX rats with estradiol valerate or isopropanolic black cohosh extract markedly decreased the average CBT and TST, TST fluctuation frequency, and the average amplitude fluctuation. Moreover, CBT was found to be significantly higher, while TST was lower in OVX + E than in OVX + ICR rats. CONCLUSIONS Both black cohosh and estradiol treatments ameliorated the abnormal thermoregulation in OVX rats. In particular, black cohosh reduced CBT better than estradiol and estradiol reduced TST better than black cohosh.
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Affiliation(s)
- Y Sun
- a Department of Obstetrics and Gynecology , Beijing Shijitan Hospital, Capital Medical University , Beijing , China
| | - L H Qin
- b Department of Anatomy and Embryology , Peking University Health Science Center , Beijing , China
| | - X Chen
- c Department of Obstetrics and Gynecology , Peking University First Hospital , Beijing , China
| | - X Yan
- d Department of Clinical Research Institute , Peking University Health Science Center , Beijing , China
| | - L Mao
- c Department of Obstetrics and Gynecology , Peking University First Hospital , Beijing , China
| | - W Bai
- a Department of Obstetrics and Gynecology , Beijing Shijitan Hospital, Capital Medical University , Beijing , China
| | - J Kang
- e Department of Physiology and Pathophysiology, School of Basic Medical Sciences , Peking University Health Science Center , Beijing , China
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Qin LH, Zhao YM, Bao YH, Bai WL, Chong J, Zhang GL, Zhang JB, Zhao ZH. Polymorphism of the prion protein gene (PRNP) in two Chinese indigenous cattle breeds. Mol Biol Rep 2010; 38:4197-204. [PMID: 21120616 DOI: 10.1007/s11033-010-0541-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Accepted: 11/16/2010] [Indexed: 10/18/2022]
Abstract
Prion protein (PRNP) gene has been located at position q17 of chromosome 13 in cattle. The polymorphisms of PRNP gene might be associated with BSE susceptibility. In the present work, we investigated the polymorphisms of PRNP gene, including SNP in exon 3, 23-bp indel in promoter region, 12-bp indel in intron 1 in 2 Chinese indigenous cattle breeds of northeast China. Eighty-six animals from Yanbian (34) and Chinese Red Steppes (52) were genotyped at PRNP locus by analyzing genomic DNA. A total of 4 single nucleotide polymorphism (SNP) sites were revealed in the PRNP gene exon 3 of the 2 cattle breeds investigated. Three of these SNPs were non-synonymous mutations that resulted in the amino acid exchanges (K119N, S154N, and M177V), and one is silent nucleotide substitutions (A234G). The two amino acid mutations of S154N and M177V were detected only in Yanbian with a very low frequency (0.0147), and they appears to be absent in Chinese Red Steppes. The average gene heterozygosity (He), effective allele numbers (Ne), Shannon's information index (I) and polymorphism information content (PIC) were 0.3088, 1.5013, 0.3814 and 0.2000 in Yanbian, respectively, being relatively higher than that of Chinese Red Steppes (0.2885, 1.4985, 0.3462 and 0.1873, respectively). In 23-bp indel and 12-bp indel loci, three different genotypes were identified in both Yanbian and Chinese Red Steppes breeds. Based 23- and 12-bp indels, four haplotypes was constructed in the 2 Chinese cattle breeds, of which the 23-bp (-)/12-bp (-) was main haplotypes accounting for more than 50% of the total in both Yanbian and Chinese Red Steppes breeds. These results might be useful in understanding the genetic characteristics of PRNP gene in Chinese indigenous cattle breeds.
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Affiliation(s)
- L H Qin
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, 130062, China
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Abstract
This paper reviews the effect of statistical uncertainties on radiotherapy treatment planning using Monte Carlo simulations. We discuss issues related to the statistical analysis of Monte Carlo dose calculations for realistic clinical beams using various variance reduction or time saving techniques. We discuss the effect of statistical uncertainties on dose prescription and monitor unit calculation for conventional treatment and intensity-modulated radiotherapy (IMRT) based on Monte Carlo simulations. We show the effect of statistical uncertainties on beamlet dose calculation and plan optimization for IMRT and other advanced treatment techniques such as modulated electron radiotherapy (MERT). We provide practical guidelines for the clinical implementation of Monte Carlo treatment planning and show realistic examples of Monte Carlo based IMRT and MERT plans.
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Affiliation(s)
- C-M Ma
- Radiation Oncology Department, Fox Chase Cancer Center, Philadelphia, PA 19111, USA.
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Abstract
One-hundred-thirty of 178 women who received Norplant-2 implants were followed prospectively for 4 years. Menstrual disorders were the most common reason for discontinuation. Only one patient conceived, for a failure rate of 0.6%.
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Affiliation(s)
- L H Qin
- Shanghai Institute of Planned Parenthood Research, Shanghai, People's Republic of China
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Qin LH, Shan YQ, Geng SN, Yang YF. [Comparison between two types of air microorganism sampling]. Zhonghua Hu Li Za Zhi 1996; 31:500-2. [PMID: 9295511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The airflow striking sampling was compared with flat utensils sedimentation sampling for collection of air microorganisms. The result showed that air microorganism count with the former method is more efficient than the latter method (P < 0.05). The flat utensils sedimentation sampling only collected larger particles of microorganism so the air microorganism count was not accurate. However, it is still a suitable method in hygiene without other choices. The airflow striking sampling collected more middle and tiny particles for air microorganism than the sedimentation sampling and can accurately show microorganism content in air, so it is an optimal sampling method.
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Affiliation(s)
- L H Qin
- First Military University of Nanfang Hospital, Guangzhou
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Kaplan AJ, Chavin KD, Qin LH, Yagita H, Bromberg JS. Production of multiple murine CD2 receptor constructs using the baculovirus expression vector and a rapid dot-blot assay. Immunol Res 1994; 13:42-8. [PMID: 7897261 DOI: 10.1007/bf02918223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The baculovirus expression system was used to produce three different constructs of the murine cell surface adhesion receptor CD2. One construct coded for a single, N-terminal, Ig-fold domain. It was inefficiently secreted and therefore primarily intracellular. The second construct coded for both extracellular, N-terminal Ig-fold domains. This was efficiently secreted into culture supernatant. The third construct coded for the full-length transmembrane molecule which localized to the cell surface. All constructs were monomers of predicted MWr and were appropriately glycosylated. They retained epitopic specificity as demonstrated by binding to mAbs, and adhesion function as demonstrated by a rosetting assay.
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Affiliation(s)
- A J Kaplan
- Department of Surgery, Medical University of South Carolina, Charleston
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Kaplan AJ, Chavin KD, Yagita H, Sandrin MS, Qin LH, Lin J, Lindenmayer G, Bromberg JS. Production and characterization of soluble and transmembrane murine CD2. Demonstration that CD48 is a ligand for CD2 and that CD48 adhesion is regulated by CD2. The Journal of Immunology 1993. [DOI: 10.4049/jimmunol.151.8.4022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
The baculovirus expression vector was used to produce full length, two amino-terminal Ig-like extracellular domains, and one amino-terminal Ig-like extracellular domain soluble murine CD2 products. The products were monomeric, glycosylated, and of the correct predicted m.w. Sf9 insect cells infected with recombinant baculovirus encoding the full length construct display cell surface CD2 by flow cytometry and rosette with murine cell lines that express the ligand for CD2. Uninfected Sf9, wild-type baculovirus-infected Sf9, and Sf9 expressing truncated products do not display cell surface CD2 nor do these latter Sf9 bind to murine cell lines. Cell binding is inhibited by anti-CD2 mAb. All CD2 products possess ligand binding activity since purified preparations of these block cell adhesion. All CD2 antigenic epitopes are close to the ligand binding site because all mAb tested can inhibit cell adhesion. The ligand for CD2 is shown to be CD48. Only CD48+ cell lines can bind CD2+ Sf9 and this is inhibited by anti-CD48 mAb. Antibodies against the closely related cell surface Ag Ly-6A.2 and Ly-9.2 do not inhibit binding. Purified, soluble CD2 also inhibits the binding of anti-CD48 mAb to the cell surface. Unexpectedly, additional mAb blocking studies show that CD2 on the surface of CD48+ cell lines influences adhesion to CD2+ binding partners. The use of cells expressing CD2 and/or CD48 provides evidence for a cis CD2-CD48 interaction on the cell surface in which CD2 negatively regulates CD48 adhesion properties.
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Affiliation(s)
- A J Kaplan
- Department of Surgery, Medical University of South Carolina, Charleston 29425
| | - K D Chavin
- Department of Surgery, Medical University of South Carolina, Charleston 29425
| | - H Yagita
- Department of Surgery, Medical University of South Carolina, Charleston 29425
| | - M S Sandrin
- Department of Surgery, Medical University of South Carolina, Charleston 29425
| | - L H Qin
- Department of Surgery, Medical University of South Carolina, Charleston 29425
| | - J Lin
- Department of Surgery, Medical University of South Carolina, Charleston 29425
| | - G Lindenmayer
- Department of Surgery, Medical University of South Carolina, Charleston 29425
| | - J S Bromberg
- Department of Surgery, Medical University of South Carolina, Charleston 29425
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Kaplan AJ, Chavin KD, Yagita H, Sandrin MS, Qin LH, Lin J, Lindenmayer G, Bromberg JS. Production and characterization of soluble and transmembrane murine CD2. Demonstration that CD48 is a ligand for CD2 and that CD48 adhesion is regulated by CD2. J Immunol 1993; 151:4022-32. [PMID: 8104993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The baculovirus expression vector was used to produce full length, two amino-terminal Ig-like extracellular domains, and one amino-terminal Ig-like extracellular domain soluble murine CD2 products. The products were monomeric, glycosylated, and of the correct predicted m.w. Sf9 insect cells infected with recombinant baculovirus encoding the full length construct display cell surface CD2 by flow cytometry and rosette with murine cell lines that express the ligand for CD2. Uninfected Sf9, wild-type baculovirus-infected Sf9, and Sf9 expressing truncated products do not display cell surface CD2 nor do these latter Sf9 bind to murine cell lines. Cell binding is inhibited by anti-CD2 mAb. All CD2 products possess ligand binding activity since purified preparations of these block cell adhesion. All CD2 antigenic epitopes are close to the ligand binding site because all mAb tested can inhibit cell adhesion. The ligand for CD2 is shown to be CD48. Only CD48+ cell lines can bind CD2+ Sf9 and this is inhibited by anti-CD48 mAb. Antibodies against the closely related cell surface Ag Ly-6A.2 and Ly-9.2 do not inhibit binding. Purified, soluble CD2 also inhibits the binding of anti-CD48 mAb to the cell surface. Unexpectedly, additional mAb blocking studies show that CD2 on the surface of CD48+ cell lines influences adhesion to CD2+ binding partners. The use of cells expressing CD2 and/or CD48 provides evidence for a cis CD2-CD48 interaction on the cell surface in which CD2 negatively regulates CD48 adhesion properties.
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Affiliation(s)
- A J Kaplan
- Department of Surgery, Medical University of South Carolina, Charleston 29425
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