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Mulder PPG, Koenen HJPM, Vlig M, Joosten I, de Vries RBM, Boekema BKHL. Burn-Induced Local and Systemic Immune Response: Systematic Review and Meta-Analysis of Animal Studies. J Invest Dermatol 2022; 142:3093-3109.e15. [PMID: 35623415 DOI: 10.1016/j.jid.2022.05.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 04/08/2022] [Accepted: 05/02/2022] [Indexed: 10/31/2022]
Abstract
As burn injuries are often followed by a derailed immune response and excessive inflammation, a thorough understanding of the occurring reactions is key to prevent secondary complications. This systematic review, that includes 247 animal studies, shows the post-burn response of 14 different immune cell types involved in immediate and long-term effects, in both wound tissue and circulation. Peripheral blood neutrophil and monocyte numbers increased directly after burns, whereas thrombocyte numbers increased near the end of the first week. Lymphocyte numbers, however, were decreased for at least two weeks. In burn wound tissue, neutrophil and macrophage numbers accumulated during the first three weeks. Burns also altered cellular functions as we found increased migratory potential of leukocytes, impaired antibacterial activity of neutrophils and enhanced inflammatory mediator production by macrophages. Neutrophil surges were positively associated with burn size and were highest in rats. Altogether, this comprehensive overview of the temporal immune cell dynamics shows that unlike normal wound healing, burn injury induces a long-lasting inflammatory response. It provides a fundamental research basis to improve experimental set-ups, burn care and outcome.
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Affiliation(s)
- Patrick P G Mulder
- Association of Dutch Burn Centres (ADBC), Preclinical Research, Beverwijk, the Netherlands; Laboratory of Medical Immunology, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, the Netherlands.
| | - Hans J P M Koenen
- Laboratory of Medical Immunology, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Marcel Vlig
- Association of Dutch Burn Centres (ADBC), Preclinical Research, Beverwijk, the Netherlands
| | - Irma Joosten
- Laboratory of Medical Immunology, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Rob B M de Vries
- SYRCLE, Department for Health Evidence, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Bouke K H L Boekema
- Association of Dutch Burn Centres (ADBC), Preclinical Research, Beverwijk, the Netherlands
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2
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Lamers C, Plüss CJ, Ricklin D. The Promiscuous Profile of Complement Receptor 3 in Ligand Binding, Immune Modulation, and Pathophysiology. Front Immunol 2021; 12:662164. [PMID: 33995387 PMCID: PMC8118671 DOI: 10.3389/fimmu.2021.662164] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 04/12/2021] [Indexed: 12/19/2022] Open
Abstract
The β2-integrin receptor family has a broad spectrum of physiological functions ranging from leukocyte adhesion, cell migration, activation, and communication to the phagocytic uptake of cells and particles. Among the members of this family, complement receptor 3 (CR3; CD11b/CD18, Mac-1, αMβ2) is particularly promiscuous in its functional profile and ligand selectivity. There are close to 100 reported structurally unrelated ligands for CR3, and while many ligands appear to cluster at the αMI domain, molecular details about binding modes remain largely elusive. The versatility of CR3 is reflected in its functional portfolio, which includes prominent roles in the removal of invaders and cell debris, induction of tolerance and synaptic pruning, and involvement in the pathogenesis of numerous autoimmune and chronic inflammatory pathologies. While CR3 is an interesting therapeutic target for immune modulation due to these known pathophysiological associations, drug development efforts are limited by concerns of potential interference with host defense functions and, most importantly, an insufficient molecular understanding of the interplay between ligand binding and functional impact. Here, we provide a systematic summary of the various interaction partners of CR3 with a focus on binding mechanisms and functional implications. We also discuss the roles of CR3 as an immune receptor in health and disease, as an activation marker in research and diagnostics, and as a therapeutic target.
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Affiliation(s)
- Christina Lamers
- Molecular Pharmacy Unit, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
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3
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Zhou H, Li Y, Gui H, Zhao H, Wu M, Li G, Li Y, Bai Z, Yin Z, Redmond HP, Wang J, Wang JH, Zhao Z. Antagonism of Integrin CD11b Affords Protection against Endotoxin Shock and Polymicrobial Sepsis via Attenuation of HMGB1 Nucleocytoplasmic Translocation and Extracellular Release. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2018; 200:1771-1780. [PMID: 29343555 DOI: 10.4049/jimmunol.1701285] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 12/15/2017] [Indexed: 09/13/2023]
Abstract
High mobility group box 1 (HMGB1), a chromatin-binding nuclear protein, plays a critical role in sepsis by acting as a key "late-phase" inflammatory mediator. Integrin CD11b is essential for inflammatory cell activation and migration, thus mediating inflammatory responses. However, it is unclear whether CD11b participates in the development of sepsis. In this study, we report that CD11b contributes to LPS-induced endotoxin shock and microbial sepsis, as antagonism of CD11b with the CD11b blocking Ab or CD11b inhibitor Gu-4 protects mice against LPS- and microbial sepsis-related lethality, which is associated with significantly diminished serum HMGB1 levels. Consistent with this, CD11b-deficient mice were more resistant to microbial sepsis with a much lower serum HMGB1 level compared with wild-type mice. Pharmacological blockage and genetic knockdown/knockout of CD11b in murine macrophages hampered LPS-stimulated HMGB1 nucleocytoplasmic translocation and extracellular release. Furthermore, silencing CD11b interrupted the interaction of HMGB1 with either a nuclear export factor chromosome region maintenance 1 or classical protein kinase C and inhibited classical protein kinase C-induced HMGB1 phosphorylation, the potential underlying mechanism(s) responsible for CD11b blockage-induced suppression of HMGB1 nucleocytoplasmic translocation and subsequent extracellular release. Thus, our results highlight that CD11b contributes to the development of sepsis, predominantly by facilitating nucleocytoplasmic translocation and active release of HMGB1.
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Affiliation(s)
- Huiting Zhou
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou 215025, China
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing 210023, China; and
| | - Yanhong Li
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou 215025, China
| | - Huan Gui
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou 215025, China
| | - He Zhao
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou 215025, China
| | - Ming Wu
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou 215025, China
| | - Gang Li
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou 215025, China
| | - Yiping Li
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou 215025, China
| | - Zhenjiang Bai
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou 215025, China
| | - Zhimin Yin
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing 210023, China; and
| | - H Paul Redmond
- Department of Academic Surgery, University College Cork, Cork University Hospital, Cork T12YN60, Ireland
| | - Jian Wang
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou 215025, China;
| | - Jiang Huai Wang
- Department of Academic Surgery, University College Cork, Cork University Hospital, Cork T12YN60, Ireland
| | - Zhihui Zhao
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing 210023, China; and
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Synthesis of a series of new glycoclusters and the evaluation of their anti-adhesion activities. Carbohydr Res 2017; 450:49-53. [PMID: 28881237 DOI: 10.1016/j.carres.2017.08.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 07/31/2017] [Accepted: 08/29/2017] [Indexed: 11/24/2022]
Abstract
According to our early researches, some glycoclusters having glucose, mannose, cellose and lactose residues showed good anti-adhesion activity of leukocytes to endothelial cells and exerted anti-inflammatory effects. Based on these results and combination principles of drugs, a series of new glycoclusters modifying with potentially anti-oxidant activity pharmacophores have been synthesized, and their anti-adhesion activities were assessed by static state cell-based adhesion assay. The results showed that some modified glycoclusters displayed better activities than their leading compound.
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5
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Binding activities of non-β-glucan glycoclusters to dectin-1 and exploration of their binding site. Carbohydr Res 2016; 429:148-54. [DOI: 10.1016/j.carres.2016.04.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 04/28/2016] [Accepted: 04/28/2016] [Indexed: 12/19/2022]
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6
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Jiang S, Niu S, Zhao ZH, Li ZJ, Li Q. Synthesis of a series of novel heteroglycoclusters and homoglycoclusters and the study of their anti-adhesion activities. Carbohydr Res 2015. [PMID: 26226085 DOI: 10.1016/j.carres.2015.06.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A new series of mixed-type heteroglycoclusters containing mannose and lactose were synthesized. In the synthesis of rigid scaffold of heteroglycocluster, we found that trans-isomer could be prepared stereoselectively by means of Grubbs olefin cross-metathesis reactions. Moreover, sequential acylation using cyclic anhydride as scaffold could give cis-isomer. These two methods may provide complementarity of stereochemistry in heteroglycocluster assembling. The anti-adhesion activities of these compounds were assessed by Surface Plasmon Resonance (SPR) and static state cell-based adhesion assay. These results indicated that the rigid scaffold might not affect the anti-adhesion activities.
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Affiliation(s)
- Shan Jiang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xueyuan Road, Haidian District, Beijing 100191, PR China
| | - Shan Niu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xueyuan Road, Haidian District, Beijing 100191, PR China
| | - Zhi-Hui Zhao
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Wenyuan Road, Qixia District, Nanjing 210046, PR China
| | - Zhong-Jun Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xueyuan Road, Haidian District, Beijing 100191, PR China.
| | - Qing Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xueyuan Road, Haidian District, Beijing 100191, PR China.
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7
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Zhou H, Ji X, Wu Y, Xuan J, Qi Z, Shen L, Lan L, Li Q, Yin Z, Li Z, Zhao Z. A dual-role of Gu-4 in suppressing HMGB1 secretion and blocking HMGB1 pro-inflammatory activity during inflammation. PLoS One 2014; 9:e89634. [PMID: 24603876 PMCID: PMC3945943 DOI: 10.1371/journal.pone.0089634] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 01/21/2014] [Indexed: 12/04/2022] Open
Abstract
Background High mobility group box 1(HMGB1) was first recognized as a nuclear protein that increased the chromatin remodeling and regulates transcription of many genes. In recent years, HMGB1 has been identified as a critical “late” pro-inflammatory mediator due to its unique secretion pattern and lethal effects in sepsis. Therefore, preventing the active release and inhibiting the pro-inflammatory activity of HMGB1 become promising strategies for the treatment of sepsis. Here, we reported the therapeutic effects of Gu-4, a lactosyl derivative, on sepsis and the underlying molecular mechanisms. Methodology/Principal Findings In an experimental rat model of sepsis caused by cecal ligation and puncture (CLP), Gu-4 administration prominently attenuated lung injury and improved the survival of the septic animals, which was positively correlated with the decrease of the serum HMGB1 level. Using RAW264.7 macrophage cell line, we further showed that Gu-4 significantly suppressed the lipopolysaccharide (LPS)-induced release and cytoplasmic translocation of HMGB1. Moreover, Gu-4 not only dose-dependently attenuated recombinant human (rhHMGB1)-induced production of TNF-α, IL-6, and IL-1β in THP-1 cells, but also greatly inhibited the adhesion of rhHMGB1-challenged THP-1 cells to HUVECs. Analyses of flow cytometry demonstrated that Gu-4 could effectively reduce the activation of CD11b elicited by rhHMGB1. Western blot analyses revealed that Gu-4 treatment could partially block the rhHMGB1-induced activation of ERK and NF-κB signalings. Meanwhile, CD11b knockdown also obviously attenuated the rhHMGB1-induced phosphorylations of ERK and IKKα/β. Conclusions/Significance Taken together, our results suggest that Gu-4 possesses a therapeutic potential in the treatment of sepsis probably via inhibiting the LPS-induced release of HMGB1 from macrophages and via suppressing the pro-inflammatory activity of HMGB1.
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Affiliation(s)
- HuiTing Zhou
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, PR China
| | - XueMei Ji
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, PR China
| | - Yun Wu
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, PR China
| | - Ju Xuan
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, PR China
| | - ZhiLin Qi
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, PR China
| | - Lei Shen
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, PR China
| | - Lei Lan
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, PR China
- Collaborative Innovation Center of Biomedicine for Public Hygiene Emergency and Critical Care, Jiangsu Life Sciences & Technology Innovation Park, Nanjing, Jiangsu, PR China
| | - Qing Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, PR China
| | - ZhiMin Yin
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, PR China
- Collaborative Innovation Center of Biomedicine for Public Hygiene Emergency and Critical Care, Jiangsu Life Sciences & Technology Innovation Park, Nanjing, Jiangsu, PR China
| | - ZhongJun Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, PR China
| | - ZhiHui Zhao
- Jiangsu Province Key Laboratory for Molecular and Medicine Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, PR China
- Collaborative Innovation Center of Biomedicine for Public Hygiene Emergency and Critical Care, Jiangsu Life Sciences & Technology Innovation Park, Nanjing, Jiangsu, PR China
- * E-mail:
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8
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Li Q, Yan TT, Niu S, Zhao YT, Meng XB, Zhao ZH, Li ZJ. Synthesis of a series of multivalent homo-, and heteroglycosides and their anti-adhesion activities. Carbohydr Res 2013; 379:78-94. [DOI: 10.1016/j.carres.2013.06.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Revised: 06/13/2013] [Accepted: 06/14/2013] [Indexed: 11/25/2022]
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9
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Application of on-line nanoLC-IT-TOF in the identification of serum β-catenin complex in mice scald model. PLoS One 2012; 7:e46530. [PMID: 23056334 PMCID: PMC3467219 DOI: 10.1371/journal.pone.0046530] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 09/04/2012] [Indexed: 11/19/2022] Open
Abstract
Severe burn shock remains an unresolved clinical problem with an urgent need to explore novel therapeutic treatments. Intracellular β-catenin, through interaction with other proteins, has been reported to be able to regulate the size of cutaneous wounds. Higher expression of β-catenin is associated with larger sized wounds. However, the identification of serum β-catenin complex is difficult and has been rarely reported. The exploitation of more binding partners can contribute to uncovering the exact mechanisms behind serum β-catenin mediated biological effects. Here, we describe a method that consists of immunoprecipitation, SDS-PAGE, in-gel digestion, and nanoLC coupled to LCMS-IT-TOF for the investigation of serum β-catenin complex in mice scald model. Among selected gel bands obtained from the protein gels, a total of 31 peptides were identified and sequenced with high statistical significance (p<0.01). Three proteins (alpha-2-marcoglobulin, serine protease inhibitor A3K, and serine protease inhibitor A1A) were identified and validated with high reliability and high reproducibility. It was inferred that these proteins might interact with serum β-catenin, which could affect the wound healing resulting from burn shock. Our study demonstrated that the on-line coupling of nano-LC with a LCMS-IT-TOF mass spectrometer was capable of sensitive and automated characterization of the serum β-catenin complex in mice scald model.
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10
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Therapeutic effects of lactosyl derivative Gu-4 in a collagen-induced arthritis rat model. Glycoconj J 2012; 29:305-13. [DOI: 10.1007/s10719-012-9407-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 05/25/2012] [Accepted: 05/28/2012] [Indexed: 01/13/2023]
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11
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Yan T, Li Q, Zhou H, Zhao Y, Yu S, Xu G, Yin Z, Li Z, Zhao Z. Gu-4 suppresses affinity and avidity modulation of CD11b and improves the outcome of mice with endotoxemia and sepsis. PLoS One 2012; 7:e30110. [PMID: 22319560 PMCID: PMC3271073 DOI: 10.1371/journal.pone.0030110] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Accepted: 12/09/2011] [Indexed: 02/06/2023] Open
Abstract
Background Systemic leukocyte activation and disseminated leukocyte adhesion will impair the microcirculation and cause severe decrements in tissue perfusion and organ function in the process of severe sepsis. Gu-4, a lactosyl derivative, could selectively target CD11b to exert therapeutic effect in a rat model of severe burn shock. Here, we addressed whether Gu-4 could render protective effects on septic animals. Methodology/Principal Findings On a murine model of endotoxemia induced by lipopolysaccharide (LPS), we found that the median effective dose (ED50) of Gu-4 was 0.929 mg/kg. In vivo treatment of Gu-4 after LPS challenge prominently attenuated LPS-induced lung injury and decreased lactic acid level in lung tissue. Using the ED50 of Gu-4, we also demonstrated that Gu-4 treatment significantly improved the survival rate of animals underwent sepsis induced by cecal ligation and puncture. By adhesion and transwell migration assays, we found that Gu-4 treatment inhibited the adhesion and transendothelial migration of LPS-stimulated THP-1 cells. By flow cytometry and microscopy, we demonstrated that Gu-4 treatment inhibited the exposure of active I-domain and the cluster formation of CD11b on the LPS-stimulated polymorphonuclear leukocytes. Western blot analyses further revealed that Gu-4 treatment markedly inhibited the activation of spleen tyrosine kinase in LPS-stimulated THP-1 cells. Conclusions/Significance Gu-4 improves the survival of mice underwent endotoxemia and sepsis, our in vitro investigations indicate that the possible underlying mechanism might involve the modulations of the affinity and avidity of CD11b on the leukocyte. Our findings shed light on the potential use of Gu-4, an interacting compound to CD11b, in the treatment of sepsis and septic shock.
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Affiliation(s)
- TingTing Yan
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Jiangsu Province, China
| | - Qing Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - HuiTing Zhou
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Jiangsu Province, China
| | - YueTao Zhao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - ShuQin Yu
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Jiangsu Province, China
| | - GuangLin Xu
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Jiangsu Province, China
| | - ZhiMin Yin
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Jiangsu Province, China
| | - ZhongJun Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
- * E-mail: (ZL); (ZZ)
| | - ZhiHui Zhao
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Jiangsu Province, China
- * E-mail: (ZL); (ZZ)
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Yu M, Yang Y, Han R, Zheng Q, Wang L, Hong Y, Li Z, Sha Y. Polyvalent lactose-quantum dot conjugate for fluorescent labeling of live leukocytes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:8534-8539. [PMID: 20121052 DOI: 10.1021/la904488w] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Oligosaccharides play crucial roles in many biorecognition processes by the so-called "cluster glycosidic effect". We here report a facile synthesis of lactose-CdSeS/ZnS quantum dot conjugate (Lac-QDs) by use of 1-thiol-beta-D-lactose via ligand exchange, which exhibits significantly high affinity and specificity to leukocytes in contrast to the monovalent lactose. Structural analyses indicate that there are about 132 lactosyl molecules assembled on single QDs and the hydrodynamic diameter is small, close to 8.2 nm. Further, Lac-QDs display good fluorescence and physicochemical stability in physiological conditions, as well as extremely low cytotoxicity. These properties facilitate the use of Lac-QDs in fluorescent labeling of live leukocytes.
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Affiliation(s)
- Min Yu
- Single-Molecule and Nanobiology Laboratory, Department of Biophysics, School of Basic Medical Sciences and Biomed-X Center, Peking University, Beijing 100191, China
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Characterization of multivalent lactose quantum dots and its application in carbohydrate-protein interactions study and cell imaging. Bioorg Med Chem 2010; 18:5234-40. [PMID: 20566293 DOI: 10.1016/j.bmc.2010.05.046] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2010] [Revised: 05/15/2010] [Accepted: 05/18/2010] [Indexed: 11/22/2022]
Abstract
We have previously reported a facile and convenient method for the preparation of a new type of lactose-CdSeS/ZnS quantum dots conjugates (Lac-QDs) that exhibit biocompatibility, noncytotoxicity and specificity to leukocytes. In order to further study the carbohydrate-protein interactions, a series of Lac-QDs with different lactose densities and a PEGylated (n=3) lactose-QDs conjugate (LacPEG-QDs) with more flexible sugar ligands were prepared. The amount of the sugar molecules on QDs can be determined by NMR, which was in agreement with the results from TGA determination. The formula of the conjugates was determined with ICP-OES. The interactions between the conjugated QDs and the PNA protein were measured using SPR, which revealed that higher lactose density favored binding affinity under the same concentration, and Lac-QDs exhibit higher affinity than LacPEG-QDs. We further used a solid phase assay to assess the anti-adhesion activity of Lac-QDs and LacPEG-QDs on the cell level. The results showed that Lac-QDs had stronger activity in preventing THP1 from adhering to HUVEC than LacPEG-QDs, which was consistent with the SPR results. We reasoned that decrease in the conformational entropy induced by appropriate restriction of sugar flexibility could enhance the binding affinity of glyco-QDs, which implies that entropy change may be the main contributor to the interaction between high valent glyco-QDs and protein. The fabrication of lactose on QDs provides a fluorescent multivalent carbohydrate probe that can be used as mimics of glycoprotein for the study of carbohydrate-protein interactions and cell imaging.
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