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Yang H, Wang J, Wang X, Wang S, Xu J, Shan Q, Wang J, Ma X, Zhu Y. Nanofiber Peptides for Bacterial Trapping: A Novel Approach to Antibiotic Alternatives in Wound Infections. Adv Healthc Mater 2024:e2304657. [PMID: 38607802 DOI: 10.1002/adhm.202304657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 04/09/2024] [Indexed: 04/14/2024]
Abstract
The pervasive employment of antibiotics has engendered the advent of drug-resistant bacteria, imperiling the well-being and health of both humans and animals. Infections precipitated by such multi-resistant bacteria, especially those induced by methicillin-resistant Staphylococcus aureus (MRSA), pervade hospital settings, constituting a grave menace to patient vitality. Antimicrobial peptides (AMPs) have garnered considerable attention as a potent countermeasure against multidrug resistant bacteria. In preceding research endeavors, an insect-derived antimicrobial peptide is identified that, while possessing antimicrobial attributes, manifested suboptimal efficacy against drug-resistant Gram-positive bacteria. To ameliorate this issue, this work enhances the antimicrobial capabilities of the initial β-hairpin AMPs by substituting the structural sequence of the original AMPs with variant lengths of hydrophobic amino acid-hydrophilic amino acid repeat units. Throughout this endeavor, this work has identified a number of peptides that possess highly effective antibacterial characteristics against a wide range of bacteria. Additionally, some of these peptides have the ability to self-assemble into nanofibers, which then build networks in a distinctive manner to capture bacteria. Consequently, they represent prospective antibiotic alternatives for addressing wound infections engendered by drug-resistant bacteria.
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Affiliation(s)
- Hao Yang
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Jiufeng Wang
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
- College of Veterinary Medicine, Sanya Institute of China Agricultural University, Sanya, 572025, China
| | - Xue Wang
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Siyu Wang
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Jieru Xu
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Qiang Shan
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Jingyi Wang
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Xi Ma
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Yaohong Zhu
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
- College of Veterinary Medicine, Sanya Institute of China Agricultural University, Sanya, 572025, China
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Stepanchuk AA, Stys PK. Spectral Fluorescence Pathology of Protein Misfolding Disorders. ACS Chem Neurosci 2024; 15:898-908. [PMID: 38407017 DOI: 10.1021/acschemneuro.3c00798] [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: 02/27/2024] Open
Abstract
Protein misfolding has been extensively studied in the context of neurodegenerative disorders and systemic amyloidoses. Due to misfolding and aggregation of proteins being highly heterogeneous and generating a variety of structures, a growing body of evidence illustrates numerous ways how the aggregates contribute to progression of diseases such as Alzheimer's disease, Parkinson's disease, and prion disorders. Different misfolded species of the same protein, commonly referred to as strains, appear to play a significant role in shaping the disease clinical phenotype and clinical progression. The distinct toxicity profiles of various misfolded proteins underscore their importance. Current diagnostics struggle to differentiate among these strains early in the disease course. This review explores the potential of spectral fluorescence approaches to illuminate the complexities of protein misfolding pathology and discusses the applications of advanced spectral methods in the detection and characterization of protein misfolding disorders. By examining spectrally variable probes, current data analysis approaches, and important considerations for the use of these techniques, this review aims to provide an overview of the progress made in this field and highlights directions for future research.
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Affiliation(s)
- Anastasiia A Stepanchuk
- Department of Clinical Neurosciences, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
| | - Peter K Stys
- Department of Clinical Neurosciences, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
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Stepanchuk AA, Stys PK. Amyloid dye pairs as spectral sensors for enhanced detection and differentiation of misfolded proteins. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2023; 248:112786. [PMID: 37742497 DOI: 10.1016/j.jphotobiol.2023.112786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/13/2023] [Accepted: 09/15/2023] [Indexed: 09/26/2023]
Abstract
Protein misfolding with subsequent formation of cross-β-sheet-rich fibrils is a well-known pathological hallmark of various neurodegenerative conditions, including Alzheimer's disease (AD). Recent evidence suggests that specific protein conformations may be the primary drivers of disease progression, differentiation of which remains a challenge with conventional methods. We have previously described a unique phenomenon of light-induced fluorescence enhancement and spectral changes of the amyloid dyes K114 and BSB, and demonstrated its utility in characterizing different amyloid fibrils. In this study, we further characterize and explore the potential of photoconversion, coupled with dual-probe staining, for improved detection of heterogeneity of amyloids using silk fibers and 5xFAD mouse brain sections. BSB and K114 were paired with either Nile Red or MCAAD-3, aiming to increase the sensitivity and specificity of staining and misfolded protein detection via complementary binding and FRET. Principal component analysis of spectral data revealed significant differences between various amyloids, and was able to detect subtle amyloid pathology in the 5xFAD mouse background brain parenchyma.
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Affiliation(s)
- Anastasiia A Stepanchuk
- Department of Clinical Neurosciences, Hotchkiss Brain Institute, University of Calgary, Cumming School of Medicine, Calgary, AB, Canada
| | - Peter K Stys
- Department of Clinical Neurosciences, Hotchkiss Brain Institute, University of Calgary, Cumming School of Medicine, Calgary, AB, Canada.
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Brandt PJ, Stepanchuk AA, Andonegui G, Benediktsson H, Stys PK, Muruve DA. Detection and Typing of Renal Amyloidosis by Fluorescence Spectroscopy Using the Environmentally Sensitive Fluorophore K114. Mol Imaging Biol 2023; 25:221-227. [PMID: 35857157 DOI: 10.1007/s11307-022-01754-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 06/27/2022] [Accepted: 07/05/2022] [Indexed: 10/17/2022]
Abstract
PURPOSE To demonstrate that spectral analysis using the K114 fluorophore can detect and differentiate AL and AA renal amyloidosis. PROCEDURES Kidney biopsies from patients with AL amyloidosis, AA amyloidosis, and normal samples with no evident pathology were stained with Congo Red and K114. The specimens were imaged on a spectral confocal microscope. RESULTS Congo Red displayed homogeneous spectra across the three tissue types while K114 chromatically distinguished between normal tissue, AL amyloid, and AA amyloid. Additionally, Congo Red displayed an increased risk of false positive staining compared to K114. Spectral phasors computed from K114-stained tissue sections quantitatively differentiated the three tissue types. K114-stained amyloid deposits displayed a significantly greater increase in brightness after 50 images acquired in rapid succession compared to normal tissue. Quantitative analysis of intensity changes in the background of diseased tissue also differentiated AL and AA amyloid samples, suggesting widespread amyloid deposition. Both amyloid and the backgrounds of diseased samples red-shifted while normal tissue blue-shifted in response to repeated imaging, supporting this theory. CONCLUSIONS K114 staining of renal biopsies is a promising technique to detect and differentiate types of renal amyloidosis. Due to the advantages this method has over traditional Congo Red staining, the techniques presented here warrant further development for potential use in clinical settings.
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Affiliation(s)
- Paula J Brandt
- Department of Medicine, University of Calgary, Calgary, AB, Canada.,Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada.,Cumming School of Medicine, University of Calgary, 3280 Hospital Dr. NW, Calgary, AB, Canada
| | - Anastasiia A Stepanchuk
- Cumming School of Medicine, University of Calgary, 3280 Hospital Dr. NW, Calgary, AB, Canada.,Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Graciela Andonegui
- Department of Medicine, University of Calgary, Calgary, AB, Canada.,Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada.,Cumming School of Medicine, University of Calgary, 3280 Hospital Dr. NW, Calgary, AB, Canada
| | - Hallgrimur Benediktsson
- Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada.,Cumming School of Medicine, University of Calgary, 3280 Hospital Dr. NW, Calgary, AB, Canada.,Department of Pathology and Laboratory Medicine, University of Calgary, Calgary, AB, Canada
| | - Peter K Stys
- Cumming School of Medicine, University of Calgary, 3280 Hospital Dr. NW, Calgary, AB, Canada.,Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Daniel A Muruve
- Department of Medicine, University of Calgary, Calgary, AB, Canada. .,Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada. .,Cumming School of Medicine, University of Calgary, 3280 Hospital Dr. NW, Calgary, AB, Canada.
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Stepanchuk AA, Morgan ML, Joseph JT, Stys PK. Dual-probe fluorescence spectroscopy for sensitive quantitation of Alzheimer’s amyloid pathology. Acta Neuropathol Commun 2022; 10:153. [DOI: 10.1186/s40478-022-01456-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 10/03/2022] [Accepted: 10/04/2022] [Indexed: 11/10/2022] Open
Abstract
AbstractProtein misfolding is a prominent pathological hallmark of neurodegenerative disorders, including Alzheimer’s disease (AD). Studies have shown that the diversity of β sheet-rich protein deposits (such as amyloid β plaques and neurofibrillary tangles), present across different brain regions, might underlie different disease phenotypes and only certain types of aggregates might be associated with cognitive decline. Conformationally sensitive fluorescent amyloid probes have the ability to report different structures of protein aggregates by virtue of their shifting emission spectra. Here we defined the binding affinity of the fluorescent amyloid probes BSB and MCAAD to disease-relevant protein aggregates, and combined the two probes to examine formalin-fixed paraffin-embedded mouse and human brain samples. Coupled with quantitative spectral phasor analysis, the dual-probe staining approach revealed remarkable heterogeneity of protein aggregates across the samples. Distinct emission spectra were consistent with certain types of deposits present in the mouse and human brain sections. The sensitivity of this staining, imaging and analysis approach outperformed conventional immunohistochemistry with the detected spectral differences between the greater parenchyma of cognitively normal and AD cases indicating a subtle yet widespread proteopathy associated with disease. Our method offers more sensitive, objective, and quantitative examination of protein misfolding pathology using conventional tissue sections.
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