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Lima C, Matos TDLR, Souza THS, Amorim MSN, Santana OA, Moura P, Moura DS, Cabral Filho PE, Alencar LMR, Fontes A. Probing the interaction of mannose-binding lectin with healthy and sickle cell anemia red blood cells and its role in cellular biomechanics. Int J Biol Macromol 2025; 300:140118. [PMID: 39842580 DOI: 10.1016/j.ijbiomac.2025.140118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2024] [Revised: 01/06/2025] [Accepted: 01/18/2025] [Indexed: 01/24/2025]
Abstract
Mannose-binding lectin (MBL) is an important glycoprotein of the human innate immune system. Furthermore, individuals with sickle cell anemia (SCA) and MBL deficiency seem more susceptible to vaso-occlusive crises, suggesting an MBL role on HbSS red blood cells (RBCs). This study investigated the interaction of MBL with HbA (healthy) and HbSS RBCs using optical tweezers (OT) and atomic force microscopy (AFM). OT was employed to measure the RBC overall elasticity, while AFM was applied to assess the local stiffness and roughness of the cell membrane. Osmotic fragility assays were also performed. Additionally, cationic quantum dots (QDs) were applied to evaluate the membrane charges of HbSS RBCs. Results using QDs indicated that HbSS RBCs have a less negatively charged surface than HbA RBCs, potentially due to a reduced sialic acid content. Osmotic fragility assays showed that MBL enhanced the resistance of RBCs to lysis, while OT and AFM indicated a decrease in their elastic capacity following MBL incubation. Moreover, OT and membrane roughness results suggested a greater interaction of MBL with HbSS RBCs. We believe this study provided insights into the MBL interaction with HbSS RBCs, inciting further investigations to better understand its involvement in SCA pathophysiology in vivo.
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Affiliation(s)
- Carinna Lima
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco 50670-901, Brazil.
| | - Tatianne de L R Matos
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco 50670-901, Brazil
| | - Tiago H S Souza
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco 50670-901, Brazil
| | - Maria S N Amorim
- Departamento de Física, Universidade Federal do Maranhão, São Luís, Maranhão 65080-805, Brazil
| | - Otacílio A Santana
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco 50670-901, Brazil
| | - Patrícia Moura
- Instituto de Ciências Biológicas, Universidade de Pernambuco, Recife, Pernambuco 50100-130, Brazil
| | - Diogenes S Moura
- Colégio de Aplicação, Universidade Federal de Pernambuco, Recife, Pernambuco 50740-550, Brazil
| | - Paulo E Cabral Filho
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco 50670-901, Brazil
| | - Luciana M R Alencar
- Departamento de Física, Universidade Federal do Maranhão, São Luís, Maranhão 65080-805, Brazil
| | - Adriana Fontes
- Departamento de Biofísica e Radiobiologia, Universidade Federal de Pernambuco, Recife, Pernambuco 50670-901, Brazil.
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Do Nascimento Amorim MS, Rates ERD, Isabela Vitoria DAC, Silva Diniz Filho JF, dos Santos CC, Santos-Oliveira R, Simões Gaspar R, Rodrigues Sanches J, Araújo Serra Pinto B, de Andrade Paes AM, Alencar LMR. Diabetes and Cognitive Decline: An Innovative Approach to Analyzing the Biophysical and Vibrational Properties of the Hippocampus. ACS OMEGA 2024; 9:40870-40881. [PMID: 39371966 PMCID: PMC11447714 DOI: 10.1021/acsomega.4c05869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2024] [Revised: 09/09/2024] [Accepted: 09/12/2024] [Indexed: 10/08/2024]
Abstract
Diabetes Mellitus (DM) is a disease characterized by high blood glucose levels, known as hyperglycemia. Diabetes represents a risk factor for the development of neurodegenerative diseases, such as Alzheimer's Disease (AD), one of the most prevalent neurodegenerative diseases worldwide, which leads to progressive mental, behavioral, and functional decline, affecting many brain structures, especially the hippocampus. Here, we aim to characterize the ultrastructural, nanomechanical, and vibrational changes in hyperglycemic hippocampal tissue using atomic force microscopy (AFM) and Raman spectroscopy. DM was induced in rats by streptozotocin injection (type 1) or dietary intervention (type 2). Cryosections of the hippocampus were prepared and analyzed on an MM8 AFM (Bruker) in Peak Force Quantitative Nanomechanics mode, performing 25 μm2 scans in 9 regions of 3 samples from each group. Ultrastructural and nanomechanical data such as surface roughness, area, volume, Young's modulus, and adhesion were evaluated. The hippocampal samples were also analyzed on a T64000 Spectrometer (Horiba), using a laser λ = 632.8 nm, and for each sample, four spectra were obtained in different regions. AFM analyses show changes on the ultrastructural scale since diabetic animals had hippocampal tissue with greater roughness and volume. Meanwhile, diabetic tissues had decreased adhesion and Young's modulus compared to control tissues. These were corroboratedby Raman data that shows changes in the molecular composition of diabetic tissues. The individual spectra show that the most significant changes are in the amide, cholesterol, and lipid bands. Overall, the data presented here show that hyperglycemia induces biophysical alterations in the hippocampal tissue of diabetic rats, providing novel biophysical and vibrational cues on the relationship between hyperglycemia and dementia.
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Affiliation(s)
- Maria
Do Socorro Do Nascimento Amorim
- Federal
University of Maranhão, Department of Physics, Laboratory of Biophysics and Nanosystems, Campus Bacanga, São Luís, Maranhão 65080-805, Brazil
- Federal
University of Maranhão, University
School, Campus Bacanga, São Luís, Maranhão 65080-805, Brazil
| | - Erick Rafael Dias Rates
- Federal
University of Maranhão, Department of Physics, Laboratory of Biophysics and Nanosystems, Campus Bacanga, São Luís, Maranhão 65080-805, Brazil
| | - de Araujo Costa
Melo Isabela Vitoria
- Federal
University of Maranhão, Department of Physics, Laboratory of Biophysics and Nanosystems, Campus Bacanga, São Luís, Maranhão 65080-805, Brazil
| | - Joel Félix Silva Diniz Filho
- Federal
University of Maranhão, Department of Physics, Laboratory of Biophysics and Nanosystems, Campus Bacanga, São Luís, Maranhão 65080-805, Brazil
| | - Clenilton Costa dos Santos
- Federal
University of Maranhão, Department of Physics, Laboratory of Biophysics and Nanosystems, Campus Bacanga, São Luís, Maranhão 65080-805, Brazil
| | - Ralph Santos-Oliveira
- Brazilian
Nuclear Energy Commission, Nuclear Engineering
Institute, Rio de
Janeiro 21941906, Brazil
- Rio
de Janeiro State University, Laboratory
of Nanoradiopharmacy, Rio de Janeiro 23070200, Brazil
| | - Renato Simões Gaspar
- Campinas
State University, Translational Medicine
Department, Campinas, Sao Paulo 13083888, Brazil
| | - Jonas Rodrigues Sanches
- Federal
University of Maranhão, Department of Physiological Sciences, Laboratory of Experimental
Physiology, Campus Bacanga, São Luís, Maranhão 65080-805, Brazil
| | - Bruno Araújo Serra Pinto
- Federal
University of Maranhão, Department of Physiological Sciences, Laboratory of Experimental
Physiology, Campus Bacanga, São Luís, Maranhão 65080-805, Brazil
| | - Antonio Marcus de Andrade Paes
- Federal
University of Maranhão, Department of Physiological Sciences, Laboratory of Experimental
Physiology, Campus Bacanga, São Luís, Maranhão 65080-805, Brazil
| | - Luciana Magalhães Rebelo Alencar
- Federal
University of Maranhão, Department of Physics, Laboratory of Biophysics and Nanosystems, Campus Bacanga, São Luís, Maranhão 65080-805, Brazil
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do Nascimento Amorim MDS, Silva França ÁR, Santos-Oliveira R, Rodrigues Sanches J, Marinho Melo T, Araújo Serra Pinto B, Barbosa LRS, Alencar LMR. Atomic Force Microscopy Applied to the Study of Tauopathies. ACS Chem Neurosci 2024; 15:699-715. [PMID: 38305187 DOI: 10.1021/acschemneuro.3c00819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024] Open
Abstract
Atomic force microscopy (AFM) is a scanning probe microscopy technique which has a physical principle, the measurement of interatomic forces between a very thin tip and the surface of a sample, allowing the obtaining of quantitative data at the nanoscale, contributing to the surface study and mechanical characterization. Due to its great versatility, AFM has been used to investigate the structural and nanomechanical properties of several inorganic and biological materials, including neurons affected by tauopathies. Tauopathies are neurodegenerative diseases featured by aggregation of phosphorylated tau protein inside neurons, leading to functional loss and progressive neurotoxicity. In the broad universe of neurodegenerative diseases, tauopathies comprise the most prevalent, with Alzheimer's disease as its main representative. This review highlights the use of AFM as a suitable research technique for the study of cellular damages in tauopathies, even in early stages, allowing elucidation of pathogenic mechanisms of these diseases.
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Affiliation(s)
- Maria do Socorro do Nascimento Amorim
- Laboratory of Biophysics and Nanosystems, Department of Physics, Federal University of Maranhão, Campus Bacanga, São Luís 65080-805, Maranhão, Brazil
| | - Álefe Roger Silva França
- Laboratory of Biophysics and Nanosystems, Department of Physics, Federal University of Maranhão, Campus Bacanga, São Luís 65080-805, Maranhão, Brazil
| | - Ralph Santos-Oliveira
- Nuclear Engineering Institute, Brazilian Nuclear Energy Commission, Rio de Janeiro 21941906, Brazil
- Laboratory of Nanoradiopharmacy, Rio de Janeiro State University, Rio de Janeiro 23070200, Brazil
| | - Jonas Rodrigues Sanches
- Laboratory of Experimental Physiology, Department of Physiological Sciences, Federal University of Maranhão, Campus Bacanga, São Luís, 65080-805, Maranhão, Brazil
| | - Thamys Marinho Melo
- Laboratory of Experimental Physiology, Department of Physiological Sciences, Federal University of Maranhão, Campus Bacanga, São Luís, 65080-805, Maranhão, Brazil
| | - Bruno Araújo Serra Pinto
- Laboratory of Experimental Physiology, Department of Physiological Sciences, Federal University of Maranhão, Campus Bacanga, São Luís, 65080-805, Maranhão, Brazil
| | - Leandro R S Barbosa
- Department of General Physics, Institute of Physics, University of São Paulo, São Paulo 05508-000, SP, Brazil
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas 13083-100, SP, Brazil
| | - Luciana Magalhães Rebelo Alencar
- Laboratory of Biophysics and Nanosystems, Department of Physics, Federal University of Maranhão, Campus Bacanga, São Luís 65080-805, Maranhão, Brazil
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Rates ERD, Almeida CD, Costa EDPF, Farias RJDM, Santos-Oliveira R, Alencar LMR. Layer-by-Layer Investigation of Ultrastructures and Biomechanics of Human Cornea. Int J Mol Sci 2022; 23:ijms23147833. [PMID: 35887181 PMCID: PMC9317547 DOI: 10.3390/ijms23147833] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 07/07/2022] [Accepted: 07/11/2022] [Indexed: 02/01/2023] Open
Abstract
The cornea is an avascular, innervated, and transparent tissue composed of five layers: the epithelium, Bowman’s layer, stroma, Descemet’s membrane, and endothelium. It is located in the outermost fraction of the eyeball and is responsible for the refraction of two-thirds of light and protection from external mechanical damage. Although several studies have been done on the cornea on the macroscopic scale, there is a lack of studies on the micro-nanoscopic scale, especially an analysis evaluating the cornea layer by layer. In this study, atomic force microscopy (AFM) was employed to assess four layers that form the cornea, analyzing: adhesion, stiffness, and roughness. The results showed microvilli in the epithelial and endothelial layers, pores in the basement membrane, and collagen fibers in the Stroma. These data increase the knowledge about the human cornea layers’ ultrastructures and adds new information about its biophysical properties.
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Affiliation(s)
- Erick Rafael Dias Rates
- Laboratory of Biophysics and Nanosystems, Department of Physics, Federal University of Maranhão, Campus Bacanga, São Luís 65080-805, MA, Brazil; (E.R.D.R.); (C.D.A.)
| | - Charles Duarte Almeida
- Laboratory of Biophysics and Nanosystems, Department of Physics, Federal University of Maranhão, Campus Bacanga, São Luís 65080-805, MA, Brazil; (E.R.D.R.); (C.D.A.)
| | - Elaine de Paula Fiod Costa
- Department of Medicine, Federal University of Maranhão, Praça Gonçalves Dias—Centro, São Luís 65020-070, MA, Brazil;
| | - Roberta Jansen de Mello Farias
- Presidente Dutra Unit, University Hospital of the Federal University of Maranhão (HUUFMA), São Luís 65020-070, MA, Brazil;
- San Francisco Eye Institute, São Luís 65076-090, MA, Brazil
| | - Ralph Santos-Oliveira
- Laboratory of Nanoradiopharmaceuticals and Radiopharmacy, Rio de Janeiro State University, Rio de Janeiro 23070-200, RJ, Brazil;
- Brazilian Nuclear Energy Commission, Nuclear Engineering Institute, Rio de Janeiro 21941-906, RJ, Brazil
| | - Luciana Magalhães Rebelo Alencar
- Laboratory of Biophysics and Nanosystems, Department of Physics, Federal University of Maranhão, Campus Bacanga, São Luís 65080-805, MA, Brazil; (E.R.D.R.); (C.D.A.)
- Correspondence:
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