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Rosú SA, Aguilar J, Urbano BF, Tarraga WA, Ramella NA, Longo GS, Finarelli GS, Sanchez Donoso SA, Tricerri MA. Interactions of variants of human apolipoprotein A-I with biopolymeric model matrices. Effect of collagen and heparin. Arch Biochem Biophys 2023; 750:109805. [PMID: 37913855 DOI: 10.1016/j.abb.2023.109805] [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: 08/10/2023] [Revised: 10/05/2023] [Accepted: 10/30/2023] [Indexed: 11/03/2023]
Abstract
BACKGROUND The extracellular matrix (ECM) is a complex tridimensional scaffold that actively participates in physiological and pathological events. The objective of this study was to test whether structural proteins of the ECM and glycosaminoglycans (GAGs) may favor the retention of human apolipoprotein A-I (apoA-I) variants associated with amyloidosis and atherosclerosis. METHODS Biopolymeric matrices containing collagen type I (Col, a main macromolecular component of the ECM) with or without heparin (Hep, a model of GAGs) were constructed and characterized, and used to compare the binding of apoA-I having the native sequence (Wt) or Arg173Pro, a natural variant inducing cardiac amyloidosis. Protein binding was observed by fluorescence microscopy and unbound proteins quantified by a colorimetric assay. RESULTS Both, Wt and Arg173Pro bound to the scaffolds containing Col, but the presence of Hep diminished the binding efficiency. Col-Hep matrices retained Arg173Pro more than the Wt. The retained protein was only partially removed from the matrices with saline solutions, indicating that electrostatic interactions may occur but are not the main driving force. Using in addition thermodynamic molecular simulations and size exclusion chromatography approaches, we suggest that the binding of apoA-I variants to the biopolymeric matrices is driven by many low affinity interactions. CONCLUSIONS Under this scenario Col-Hep scaffolds contribute to the binding of Arg173Pro, as a cooperative platform which could modify the native protein conformation affecting protein folding. GENERAL SIGNIFICANCE We show that the composition of the ECM is key to the protein retention, and well characterized biosynthetic matrices offer an invaluable in vitro model to mimic the hallmark of pathologies with interstitial infiltration such as cardiac amyloidosis.
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Affiliation(s)
- Silvana A Rosú
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), CONICET. Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120, La Plata, Buenos Aires, Argentina; Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Joao Aguilar
- Laboratorio de Interacciones Macromoleculares (LIMM), Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile
| | - Bruno F Urbano
- Laboratorio de Interacciones Macromoleculares (LIMM), Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile
| | - Wilson A Tarraga
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, La Plata, Buenos Aires, Argentina
| | - Nahuel A Ramella
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), CONICET. Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120, La Plata, Buenos Aires, Argentina; Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Gabriel S Longo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, La Plata, Buenos Aires, Argentina
| | - Gabriela S Finarelli
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), CONICET. Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120, La Plata, Buenos Aires, Argentina
| | - Susana A Sanchez Donoso
- Laboratorio de Interacciones Macromoleculares (LIMM), Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile.
| | - M Alejandra Tricerri
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), CONICET. Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120, La Plata, Buenos Aires, Argentina; Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina.
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Schuty B, Martínez S, Guerra A, Lecumberry F, Magliano J, Malacrida L. Quantitative melanoma diagnosis using spectral phasor analysis of hyperspectral imaging from label-free slices. Front Oncol 2023; 13:1296826. [PMID: 38162497 PMCID: PMC10756080 DOI: 10.3389/fonc.2023.1296826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 10/31/2023] [Indexed: 01/03/2024] Open
Abstract
Introduction Melanoma diagnosis traditionally relies on microscopic examination of hematoxylin and eosin (H&E) slides by dermatopathologists to search for specific architectural and cytological features. Unfortunately, no single molecular marker exists to reliably differentiate melanoma from benign lesions such as nevi. This study explored the potential of autofluorescent molecules within tissues to provide molecular fingerprints indicative of degenerated melanocytes in melanoma. Methods Using hyperspectral imaging (HSI) and spectral phasor analysis, we investigated autofluorescence patterns in melanoma compared to intradermal nevi. Using UV excitation and a commercial spectral confocal microscope, we acquired label-free HSI data from the whole-slice samples. Results Our findings revealed distinct spectral phasor distributions between melanoma and intradermal nevi, with melanoma displaying a broader phasor phase distribution, signifying a more heterogeneous autofluorescence pattern. Notably, longer wavelengths associated with larger phases correlated with regions identified as melanoma by expert dermatopathologists using H&E staining. Quantitative analysis of phase and modulation histograms within the phasor clusters of five melanomas (with Breslow thicknesses ranging from 0.5 mm to 6 mm) and five intradermal nevi consistently highlighted differences between the two groups. We further demonstrated the potential for the discrimination of several melanocytic lesions using center-of-mass comparisons of phase and modulation variables. Remarkably, modulation versus phase center of mass comparisons revealed strong statistical significance among the groups. Additionally, we identified the molecular endogenous markers responsible for tissue autofluorescence, including collagen, elastin, NADH, FAD, and melanin. In melanoma, autofluorescence is characterized by a higher phase contribution, indicating an increase in FAD and melanin in melanocyte nests. In contrast, NADH, elastin, and collagen dominate the autofluorescence of the nevus. Discussion This work underscores the potential of autofluorescence and HSI-phasor analysis as valuable tools for quantifying tissue molecular fingerprints, thereby supporting more effective and quantitative melanoma diagnosis.
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Affiliation(s)
- Bruno Schuty
- Unidad de Bioimagenología Avanzada, Institut Pasteur de Montevideo, Hospital de Clínicas Universidad de la República, Montevideo, Uruguay
| | - Sofía Martínez
- Unidad de Bioimagenología Avanzada, Institut Pasteur de Montevideo, Hospital de Clínicas Universidad de la República, Montevideo, Uruguay
- Unidad Academica de Dermatología, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Analía Guerra
- Unidad Academica de Dermatología, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Federico Lecumberry
- Instituto de Ingeniería Eléctrica, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay
| | - Julio Magliano
- Unidad Academica de Dermatología, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Leonel Malacrida
- Unidad de Bioimagenología Avanzada, Institut Pasteur de Montevideo, Hospital de Clínicas Universidad de la República, Montevideo, Uruguay
- Unidad Academica de Fisiopatología, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
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