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Wulff BR, Lohse S, Tschoerner M. Influence of drying time on the removal of blood from medical devices. J Hosp Infect 2024:S0195-6701(24)00270-6. [PMID: 39154898 DOI: 10.1016/j.jhin.2024.07.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 07/16/2024] [Accepted: 07/24/2024] [Indexed: 08/20/2024]
Abstract
BACKGROUND When processing surgical instruments after use, the safe, residue-free removal of blood and blood-containing soiling is one of the most important tasks. There are recommendations from various working groups regarding the ideal time frame for cleaning used instruments in order to ensure safe disinfection and sterilisation and avoid adverse effects. These are generally based primarily on practical experience and there is little systematic work on this topic. AIM In the present study, cleaning experiments with test specimens previously contaminated with sheep's blood were carried out and in this way the effects of the drying time of whole blood on the results of the subsequent cleaning were examined. METHODS Reflecting practice, both visual and spectroscopic methods were used to quantify residual protein. The experimental results were evaluated both as a function of the drying time and the residual moisture of the blood. FINDINGS It was found that drying blood is particularly difficult to remove within the first 1-2 hours. In this phase, in which the blood is coagulated but not yet completely dried, considerably more protein residues remained on the test specimens after cleaning than after longer standing times. CONCLUSIONS It was concluded that there is a time frame for the removal of blood residues in which optimum cleaning results can be expected. As a consequence, there are also standing times that are disadvantageous for reprocessing. Based on the experimental data, it was deduced that this optimum time is either directly after contamination or in the range of > 3 h and < 24 h after soiling.
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Affiliation(s)
- Bastian R Wulff
- Chemische Fabrik Dr. Weigert GmbH & Co. KG, Hamburg, GERMANY.
| | - Stefanie Lohse
- Chemische Fabrik Dr. Weigert GmbH & Co. KG, Hamburg, GERMANY
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Pertzborn D, Bali A, Mühlig A, von Eggeling F, Guntinas-Lichius O. Hyperspectral imaging and evaluation of surgical margins: where do we stand? Curr Opin Otolaryngol Head Neck Surg 2024; 32:96-104. [PMID: 38193544 DOI: 10.1097/moo.0000000000000957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
PURPOSE OF REVIEW To highlight the recent literature on the use of hyperspectral imaging (HSI) for cancer margin evaluation ex vivo, for head and neck cancer pathology and in vivo during head and neck cancer surgery. RECENT FINDINGS HSI can be used ex vivo on unstained and stained tissue sections to analyze head and neck tissue and tumor cells in combination with machine learning approaches to analyze head and neck cancer cell characteristics and to discriminate the tumor border from normal tissue. Data on in vivo applications during head and neck cancer surgery are preliminary and limited. Even now an accuracy of 80% for tumor versus nonneoplastic tissue classification can be achieved for certain tasks, within the current in vivo settings. SUMMARY Significant progress has been made to introduce HSI for ex vivo head and neck cancer pathology evaluation and for an intraoperative use to define the tumor margins. To optimize the accuracy for in vivo use, larger HSI databases with annotations for head and neck cancer are needed.
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Affiliation(s)
- David Pertzborn
- Department of Otorhinolaryngology, Jena University Hospital, Jena, Germany
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Puustinen S, Vrzáková H, Hyttinen J, Rauramaa T, Fält P, Hauta-Kasari M, Bednarik R, Koivisto T, Rantala S, von Und Zu Fraunberg M, Jääskeläinen JE, Elomaa AP. Hyperspectral Imaging in Brain Tumor Surgery-Evidence of Machine Learning-Based Performance. World Neurosurg 2023; 175:e614-e635. [PMID: 37030483 DOI: 10.1016/j.wneu.2023.03.149] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 03/31/2023] [Indexed: 04/10/2023]
Abstract
BACKGROUND Hyperspectral imaging (HSI) has the potential to enhance surgical tissue detection and diagnostics. Definite utilization of intraoperative HSI guidance demands validated machine learning and public datasets that currently do not exist. Moreover, current imaging conventions are dispersed, and evidence-based paradigms for neurosurgical HSI have not been declared. METHODS We presented the rationale and a detailed clinical paradigm for establishing microneurosurgical HSI guidance. In addition, a systematic literature review was conducted to summarize the current indications and performance of neurosurgical HSI systems, with an emphasis on machine learning-based methods. RESULTS The published data comprised a few case series or case reports aiming to classify tissues during glioma operations. For a multitissue classification problem, the highest overall accuracy of 80% was obtained using deep learning. Our HSI system was capable of intraoperative data acquisition and visualization with minimal disturbance to glioma surgery. CONCLUSIONS In a limited number of publications, neurosurgical HSI has demonstrated unique capabilities in contrast to the established imaging techniques. Multidisciplinary work is required to establish communicable HSI standards and clinical impact. Our HSI paradigm endorses systematic intraoperative HSI data collection, which aims to facilitate the related standards, medical device regulations, and value-based medical imaging systems.
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Affiliation(s)
- Sami Puustinen
- University of Eastern Finland, Faculty of Health Sciences, School of Medicine, Kuopio, Finland; Kuopio University Hospital, Eastern Finland Microsurgery Center, Kuopio, Finland.
| | - Hana Vrzáková
- Kuopio University Hospital, Eastern Finland Microsurgery Center, Kuopio, Finland; University of Eastern Finland, Faculty of Science and Forestry, School of Computing, Joensuu, Finland
| | - Joni Hyttinen
- University of Eastern Finland, Faculty of Science and Forestry, School of Computing, Joensuu, Finland
| | - Tuomas Rauramaa
- Kuopio University Hospital, Department of Clinical Pathology, Kuopio, Finland
| | - Pauli Fält
- University of Eastern Finland, Faculty of Science and Forestry, School of Computing, Joensuu, Finland
| | - Markku Hauta-Kasari
- University of Eastern Finland, Faculty of Science and Forestry, School of Computing, Joensuu, Finland
| | - Roman Bednarik
- University of Eastern Finland, Faculty of Science and Forestry, School of Computing, Joensuu, Finland
| | - Timo Koivisto
- Kuopio University Hospital, Department of Neurosurgery, Kuopio, Finland
| | - Susanna Rantala
- Kuopio University Hospital, Department of Neurosurgery, Kuopio, Finland
| | - Mikael von Und Zu Fraunberg
- Oulu University Hospital, Department of Neurosurgery, Oulu, Finland; University of Oulu, Faculty of Medicine, Research Unit of Clinical Medicine, Oulu, Finland
| | | | - Antti-Pekka Elomaa
- University of Eastern Finland, Faculty of Health Sciences, School of Medicine, Kuopio, Finland; Kuopio University Hospital, Eastern Finland Microsurgery Center, Kuopio, Finland; Kuopio University Hospital, Department of Neurosurgery, Kuopio, Finland
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Souza JS, Farani PSG, Ferreira BIS, Barbosa HS, Menna-Barreto RFS, Moreira OC, Mariante RM. Establishment of a murine model of congenital toxoplasmosis and validation of a qPCR assay to assess the parasite load in maternal and fetal tissues. Front Microbiol 2023; 14:1124378. [PMID: 36922978 PMCID: PMC10009190 DOI: 10.3389/fmicb.2023.1124378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 02/06/2023] [Indexed: 03/03/2023] Open
Abstract
Toxoplasma gondii is the causative agent of toxoplasmosis, a disease that affects warm-blooded animals and one third of the human population worldwide. Pregnant women who have never been exposed to the parasite constitute an important risk group, as infection during pregnancy often leads to congenital toxoplasmosis, the most severe form of the disease. Current therapy for toxoplasmosis is the same as it was 50 years ago and has little or no effect when vertical transmission occurs. Therefore, it is urgent to develop new strategies to prevent mother-to-fetus transmission. The implementation of experimental animal models of congenital toxoplasmosis that reproduces the transmission rates and clinical signs in humans opens an avenue of possibilities to interfere in the progression of the disease. In addition, knowing the parasite load in maternal and fetal tissues after infection, which may be related to organ abnormalities and disease outcome, is another important step in designing a promising intervention strategy. Therefore, we implemented here a murine model of congenital toxoplasmosis with outbred Swiss Webster mice infected intravenously with tachyzoites of the ME49 strain of T. gondii that mimics the frequency of transmission of the parasite, as well as important clinical signs of human congenital toxoplasmosis, such as macrocephaly, in addition to providing a highly sensitive quantitative real-time PCR assay to assess parasite load in mouse tissues. As the disease is not restricted to humans, also affecting several domestic animals, including companion animals and livestock, they can also benefit from the model presented in this study.
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Affiliation(s)
- Jéssica S Souza
- Laboratório de Biologia Estrutural, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Priscila S G Farani
- Plataforma de PCR em Tempo Real RPT09A, Laboratório de Virologia Molecular, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil.,Department of Biological Science, Border Biomedical Research Center, The University of Texas at El Paso, El Paso, TX, United States
| | - Beatriz I S Ferreira
- Plataforma de PCR em Tempo Real RPT09A, Laboratório de Virologia Molecular, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Helene S Barbosa
- Laboratório de Biologia Estrutural, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | | | - Otacilio C Moreira
- Plataforma de PCR em Tempo Real RPT09A, Laboratório de Virologia Molecular, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Rafael M Mariante
- Laboratório de Biologia Estrutural, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
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Early detection of stripe rust infection in wheat using light-induced fluorescence spectroscopy. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES : OFFICIAL JOURNAL OF THE EUROPEAN PHOTOCHEMISTRY ASSOCIATION AND THE EUROPEAN SOCIETY FOR PHOTOBIOLOGY 2023; 22:115-134. [PMID: 36121603 DOI: 10.1007/s43630-022-00303-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 09/08/2022] [Indexed: 01/12/2023]
Abstract
In the current study, the application of fluorescence spectroscopy along with the advanced statistical technique and confocal microscopy was investigated for the early detection of stripe rust infection in wheat grown under field conditions. The indigenously developed Fluorosensor fitted with LED, emitting monochromatic light was used that covered comparatively larger leaf area for recording fluorescence data thus presenting more reliable current status of the leaf. The examined leaf samples covered the entire range of stripe rust disease infection from no visible symptoms to the complete disease prevalence. The molecular changes were also assessed in the leaves as the disease progresses. The emission spectra mainly produce two fluorescence emission classes, namely the blue-green fluorescence (400-600 nm range) and chlorophyll fluorescence (650-800 nm range). The chlorophyll fluorescence region showed lower chlorophyll bands both at 685 and 735 nm in the asymptomatic (early diseased) and symptomatic (diseased) leaf samples than the healthy ones as a result of partial deactivation of PSII reaction centers. The 735 nm chlorophyll fluorescence band was either slight or completely absent in the leaf samples with lower to higher disease incidence and thus differentiate between the healthy and the infected leaf samples. The Hydroxycinnamic acids (caffeic and sinapic acids) showed decreasing trend, whereas the ferulic acid increased with the rise in disease infection. Peak broadening/shifting has been observed in case of ferulic acid and carotenes/carotenoids, with the increase in the disease intensity. While using the LEDs (365 nm), the peak broadening and the decline in the chlorophyll fluorescence bands could be used for the early prediction of stripe rust disease in wheat crop. The PLSR statistical techniques discriminated well between the healthy and the diseased samples, thus showed promise in early disease detection. Confocal microscopy confirmed the early prevalence of stripe rust disease infection in a susceptible variety at a stage when the disease is not detectable visually. It is inferred that fluorescence emission spectroscopy along with the chemometrics aided in the effective and timely diagnosis of plant diseases and the detected signatures provide the basis for remote sensing.
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Microfluidic-Based Novel Optical Quantification of Red Blood Cell Concentration in Blood Flow. BIOENGINEERING (BASEL, SWITZERLAND) 2022; 9:bioengineering9060247. [PMID: 35735490 PMCID: PMC9219653 DOI: 10.3390/bioengineering9060247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 06/03/2022] [Accepted: 06/07/2022] [Indexed: 11/23/2022]
Abstract
The optical quantification of hematocrit (volumetric percentage of red blood cells) in blood flow in microfluidic systems provides enormous help in designing microfluidic biosensing platforms with enhanced sensitivity. Although several existing methods, such as centrifugation, complete blood cell count, etc., have been developed to measure the hematocrit of the blood at the sample preparation stage, these methods are impractical to measure the hematocrit in dynamic microfluidic blood flow cases. An easy-to-access optical method has emerged as a hematocrit quantification technique to address this limitation, especially for the microfluidic-based biosensing platform. A novel optical quantification method is demonstrated in this study, which can measure the hematocrit of the blood flow at a targeted location in a microchannel at any given instant. The images of the blood flow were shot using a high-speed camera through an inverted transmission microscope at various light source intensities, and the grayscale of the images was measured using an image processing code. By measuring the average grayscale of the images of blood flow at different luminous exposures, a relationship between hematocrit and grayscale has been developed. The quantification of the hematocrit in the microfluidic system can be instant and easy with this method. The innovative proposed technique has been evaluated with porcine blood samples with hematocrit ranging from 5% to 70%, flowing through 1000 µm wide and 100 µm deep microchannels. The experimental results obtained strongly supported the proposed optical technique of hematocrit measurement in microfluidic systems.
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Wolf M, Ortiz-Garcia JJ, Guberman-Pfeffer MJ, Gascón JA, Quardokus RC. Electronic energy levels of porphyrins are influenced by the local chemical environment. RSC Adv 2022; 12:1361-1365. [PMID: 35425205 PMCID: PMC8978926 DOI: 10.1039/d1ra09116f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 12/23/2021] [Indexed: 11/26/2022] Open
Abstract
Self-assembled islands of 5,10,15,20-tetrakis(pentafluoro-phenyl)porphyrin (2HTFPP) on Au(111) contain two bistable molecular species that differ by shifted electronic energy levels. Interactions with the underlying gold herringbone reconstruction and neighboring 2HTFPP molecules cause approximately 60% of molecules to have shifted electronic energy levels. We observed the packing density decrease from 0.64 ± 0.04 molecules per nm2 to 0.38 ± 0.03 molecules per nm2 after annealing to 200 °C. The molecules with shifted electronic energy levels show longer-range hexagonal packing or are adjacent to molecular vacancies, indicating that molecule-molecule and molecule-substrate interactions contribute to the shifted energies. Multilayers of porphyrins do not exhibit the same shifting of electronic energy levels which strongly suggests that molecule-substrate interactions play a critical role in stabilization of two electronic species of 2HTFPP on Au(111).
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Affiliation(s)
- Margaret Wolf
- Department of Chemistry, University of Connecticut USA +1-860-486-2981 +1-860-486-2844
| | - José J Ortiz-Garcia
- Department of Chemistry, University of Connecticut USA +1-860-486-2981 +1-860-486-2844
| | | | - José A Gascón
- Department of Chemistry, University of Connecticut USA +1-860-486-2981 +1-860-486-2844
| | - Rebecca C Quardokus
- Department of Chemistry, University of Connecticut USA +1-860-486-2981 +1-860-486-2844
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Canavieira LM, Brasil EM, Silva TDME, Borges RDS, Silva JRA, Lameira J, Bernhardt PV, Williams CM, Alves CN. Experimental and theoretical approaches for the development of 4H-Chromene derivatives as inhibitors of tyrosinase. MOLECULAR SIMULATION 2021. [DOI: 10.1080/08927022.2021.1926455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Luciana Morais Canavieira
- Programa de Pós-Graduação em Biotecnologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Brazil
| | - Edikarlos Macedo Brasil
- Peptide Science Laboratory, School of Chemistry and Physics, University of KwaZulu-Natal, Durban, South Africa
| | - Thiago de Melo e Silva
- Programa de Pós-Graduação em Química, Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, Brazil
| | - Rosivaldo dos Santos Borges
- Núcleo de Estudos e Seleção de Moléculas Bioativas, Instituto de Ciências da Saúde, Universidade Federal do Pará, Belém, Brazil
| | - José Rogério Araújo Silva
- Programa de Pós-Graduação em Química, Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, Brazil
| | - Jerônimo Lameira
- Programa de Pós-Graduação em Biotecnologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Brazil
- Programa de Pós-Graduação em Química, Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, Brazil
| | - Paul V. Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia
| | - Cláudio Nahum Alves
- Programa de Pós-Graduação em Química, Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, Brazil
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Weber A, Jackson Y. A Survey of Neonatal Clinicians' Use, Needs, and Preferences for Kangaroo Care Devices. Adv Neonatal Care 2021; 21:232-241. [PMID: 32858546 PMCID: PMC7907250 DOI: 10.1097/anc.0000000000000790] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Decades of research supports the benefits of kangaroo care (KC) for the parent and newborn. Supportive KC devices may be an important tool clinicians can use to assist parents with KC. In recent years, there has been a rise in the availability of KC devices. However, the use, needs, and preferences for these supportive devices by neonatal clinicians have not been documented. PURPOSE To survey clinicians' use, needs, and preferences of KC supportive devices, and examine whether differences exist based on clinician and organizational characteristics. METHODS A cross-sectional, online survey was sent through neonatal organization Web sites, conferences, and social media. RESULTS Many clinicians (n = 68, 43%; N = 158) facilitated KC with a supportive device, with 81% of devices provided by the clinician's employer. The most important "Must Have" feature of a KC device was "Safety: Reduces patient falls if caregiver sleeps or needs to use hands" (84% of respondents) followed by washability (82%), and "immediate, effective access to the baby" (78%). Clinicians' responses did not differ based on hospital setting, type of unit, KC experience, or experience using a KC device. IMPLICATIONS FOR PRACTICE To support safe use of KC devices in neonatal intensive care unit (NICU) clinical care, a device must hold the proper KC position consistently, allow immediate access to the infant, and hold the infant in place without the parent's hands to prevent falls. Training is needed to ensure safe device use. IMPLICATIONS FOR RESEARCH Future research should evaluate the safety, efficacy, and cost-effectiveness of these devices.
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Affiliation(s)
- Ashley Weber
- University of Cincinnati, Proctor Hall, College of Nursing,
3110 Vine Street, Cincinnati OH, 45221 USA
| | - Yamile Jackson
- Nurtured by Design, P.O. Box 3276 Sugar Land, TX, 77487
USA
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Puustinen S, Alaoui S, Bartczak P, Bednarik R, Koivisto T, Dietz A, von Und Zu Fraunberg M, Iso-Mustajärvi M, Elomaa AP. Spectrally Tunable Neural Network-Assisted Segmentation of Microneurosurgical Anatomy. Front Neurosci 2020; 14:640. [PMID: 32694976 PMCID: PMC7339939 DOI: 10.3389/fnins.2020.00640] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 05/25/2020] [Indexed: 11/29/2022] Open
Abstract
Background Distinct tissue types are differentiated based on the surgeon’s knowledge and subjective visible information, typically assisted with white-light intraoperative imaging systems. Narrow-band imaging (NBI) assists in tissue identification and enables automated classifiers, but many anatomical details moderate computational predictions and cause bias. In particular, tissues’ light-source-dependent optical characteristics, anatomical location, and potentially hazardous microstructural changes such as peeling have been overlooked in previous literature. Methods Narrow-band images of five (n = 5) facial nerves (FNs) and internal carotid arteries (ICAs) were captured from freshly frozen temporal bones. The FNs were split into intracranial and intratemporal samples, and ICAs’ adventitia was peeled from the distal end. Three-dimensional (3D) spectral data were captured by a custom-built liquid crystal tunable filter (LCTF) spectral imaging (SI) system. We investigated the normal variance between the samples and utilized descriptive and machine learning analysis on the image stack hypercubes. Results Reflectance between intact and peeled arteries in lower-wavelength domains between 400 and 576 nm was significantly different (p < 0.05). Proximal FN could be differentiated from distal FN in a higher range, 490–720 nm (p < 0.001). ICA with intact tunica differed from proximal FN nearly thorough the VIS range, 412–592 nm (p < 0.001) and 664–720 nm (p < 0.05) as did its distal counterpart, 422–720 nm (p < 0.001). The availed U-Net algorithm classified 90.93% of the pixels correctly in comparison to tissue margins delineated by a specialist. Conclusion Selective NBI represents a promising method for assisting tissue identification and computational segmentation of surgical microanatomy. Further multidisciplinary research is required for its clinical applications and intraoperative integration.
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Affiliation(s)
- Sami Puustinen
- School of Medicine, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
| | - Soukaina Alaoui
- School of Computing, Faculty of Science and Forestry, University of Eastern Finland, Joensuu, Finland
| | - Piotr Bartczak
- School of Computing, Faculty of Science and Forestry, University of Eastern Finland, Joensuu, Finland
| | - Roman Bednarik
- School of Computing, Faculty of Science and Forestry, University of Eastern Finland, Joensuu, Finland
| | - Timo Koivisto
- Department of Neurosurgery, Neurocenter, Kuopio University Hospital, Kuopio, Finland
| | - Aarno Dietz
- Department of Otolaryngology, Kuopio University Hospital, Kuopio, Finland
| | | | - Matti Iso-Mustajärvi
- Department of Otolaryngology, Kuopio University Hospital, Kuopio, Finland.,Eastern Finland Center of Microsurgery, Kuopio University Hospital, Kuopio, Finland
| | - Antti-Pekka Elomaa
- Eastern Finland Center of Microsurgery, Kuopio University Hospital, Kuopio, Finland
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Swanberg KM, Landheer K, Pitt D, Juchem C. Quantifying the Metabolic Signature of Multiple Sclerosis by in vivo Proton Magnetic Resonance Spectroscopy: Current Challenges and Future Outlook in the Translation From Proton Signal to Diagnostic Biomarker. Front Neurol 2019; 10:1173. [PMID: 31803127 PMCID: PMC6876616 DOI: 10.3389/fneur.2019.01173] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 10/21/2019] [Indexed: 01/03/2023] Open
Abstract
Proton magnetic resonance spectroscopy (1H-MRS) offers a growing variety of methods for querying potential diagnostic biomarkers of multiple sclerosis in living central nervous system tissue. For the past three decades, 1H-MRS has enabled the acquisition of a rich dataset suggestive of numerous metabolic alterations in lesions, normal-appearing white matter, gray matter, and spinal cord of individuals with multiple sclerosis, but this body of information is not free of seeming internal contradiction. The use of 1H-MRS signals as diagnostic biomarkers depends on reproducible and generalizable sensitivity and specificity to disease state that can be confounded by a multitude of influences, including experiment group classification and demographics; acquisition sequence; spectral quality and quantifiability; the contribution of macromolecules and lipids to the spectroscopic baseline; spectral quantification pipeline; voxel tissue and lesion composition; T1 and T2 relaxation; B1 field characteristics; and other features of study design, spectral acquisition and processing, and metabolite quantification about which the experimenter may possess imperfect or incomplete information. The direct comparison of 1H-MRS data from individuals with and without multiple sclerosis poses a special challenge in this regard, as several lines of evidence suggest that experimental cohorts may differ significantly in some of these parameters. We review the existing findings of in vivo1H-MRS on central nervous system metabolic abnormalities in multiple sclerosis and its subtypes within the context of study design, spectral acquisition and processing, and metabolite quantification and offer an outlook on technical considerations, including the growing use of machine learning, by future investigations into diagnostic biomarkers of multiple sclerosis measurable by 1H-MRS.
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Affiliation(s)
- Kelley M Swanberg
- Department of Biomedical Engineering, Columbia University Fu Foundation School of Engineering and Applied Science, New York, NY, United States
| | - Karl Landheer
- Department of Biomedical Engineering, Columbia University Fu Foundation School of Engineering and Applied Science, New York, NY, United States
| | - David Pitt
- Department of Neurology, Yale University School of Medicine, New Haven, CT, United States
| | - Christoph Juchem
- Department of Biomedical Engineering, Columbia University Fu Foundation School of Engineering and Applied Science, New York, NY, United States.,Department of Radiology, Columbia University College of Physicians and Surgeons, New York, NY, United States
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Ashooriha M, Khoshneviszadeh M, Khoshneviszadeh M, Moradi SE, Rafiei A, Kardan M, Emami S. 1,2,3-Triazole-based kojic acid analogs as potent tyrosinase inhibitors: Design, synthesis and biological evaluation. Bioorg Chem 2018; 82:414-422. [PMID: 30428420 DOI: 10.1016/j.bioorg.2018.10.069] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 10/30/2018] [Accepted: 10/30/2018] [Indexed: 12/28/2022]
Abstract
A series of kojic acid-derived compounds 6a-p bearing aryloxymethyl-1H-1,2,3-triazol-1-yl moiety were designed by modifying primary alcoholic group of kojic acid as tyrosinase inhibitors. The target compounds 6a-p were synthesized via click reaction. All compounds showed very potent anti-tyrosinase activity (IC50s = 0.06-6.80 µM), being superior to reference drug, kojic acid. In particular, the naphthyloxy analogs 6o and 6p were found to be 31-155 times more potent than kojic acid. The metal-binding study of selected compound 6o revealed that the prototype compound possesses metal-chelating ability, particularly with Cu2+ ions. The promising compounds 6o and 6p had acceptable safety profile as demonstrated by cytotoxicity assay against melanoma (B16) cell line and Human Foreskin Fibroblast (HFF) cells.
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Affiliation(s)
- Morteza Ashooriha
- Department of Medicinal Chemistry, Student Research Committee, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran
| | - Mehdi Khoshneviszadeh
- Department of Medicinal Chemistry, Faculty of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran; Medicinal and Natural Products Chemistry Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mahsima Khoshneviszadeh
- Medicinal and Natural Products Chemistry Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Seyed Ershad Moradi
- Pharmaceutical Sciences Research Center, Student Research Committee, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran
| | - Alireza Rafiei
- Department of Immunology and Molecular and Cell Biology Research Center, Hemoglobinopathy Institute, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Mostafa Kardan
- Department of Immunology and Molecular and Cell Biology Research Center, Hemoglobinopathy Institute, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Saeed Emami
- Department of Medicinal Chemistry and Pharmaceutical Sciences Research Center, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran.
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Ortiz-Hidalgo C, Pina-Oviedo S. Hematoxylin: Mesoamerica’s Gift to Histopathology. Palo de Campeche (Logwood Tree), Pirates’ Most Desired Treasure, and Irreplaceable Tissue Stain. Int J Surg Pathol 2018; 27:4-14. [DOI: 10.1177/1066896918787652] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Hematoxylin is a basic dye derived from the heartwood of Palo de Campeche ( Haematoxylum campechianum), the logwood tree native to Mexico and Central America. Haematoxylum means “bloodwood” in reference to its dark-red heartwood and campechianum refers to its site of origin, the coastal city of Campeche on the Yucatan Peninsula, Mexico. Hematoxylin is colorless but it turns into the color dye hematein after oxidation (ripening). The dyeing property of logwood was well-known to the natives of the Yucatan Peninsula before the arrival of the Spaniards who brought it to Europe shortly after the discovery of the Americas. An important trade soon developed related to growing and preparing hematoxylin for dyeing fabrics. Pirates discovered that one shipload of logwood was equivalent to a year’s value from any other cargo, and by 1563, more than 400 pirate vessels wandered the Atlantic Ocean and attacked Spanish galleons transporting gold, silver, and logwood from the Americas to Europe. Hematoxylin and eosin is a staining method that dates back to the late 19th century. In 1865 and 1891, Böhmer and Meyer, respectively, first used hematoxylin in combination with a mordant (alum). Later, with the use of anilines by Ehrlich, the repertoire of stains expanded rapidly resulting in the microscopic descriptions of multiple diseases that were defined by their stainable features. Today hematoxylin, along with eosin, remains the most popular stain in histology.
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Affiliation(s)
- Carlos Ortiz-Hidalgo
- Hospital y Fundación Médica Sur, Mexico City, Mexico
- Universidad Panamericana, Mexico City, Mexico
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Maheshwari A, Finger PT. Regression patterns of choroidal melanoma: After palladium-103 ( 103Pd) plaque brachytherapy. Eur J Ophthalmol 2018; 28:722-730. [PMID: 29788760 PMCID: PMC6210576 DOI: 10.1177/1120672118776146] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Purpose: To describe the patterns of regression of choroidal melanoma after treatment with plaque brachytherapy. Methods: Retrospective interventional case series including 170 consecutive patients treated with 103Pd eye plaque radiation for choroidal melanoma. Outcome measures were changes in tumor thickness, surface characteristics, tumor vascularity, ultrasonography, fluorescein angiography, optical coherence tomography, and histopathology. Results: The mean initial tumor thickness was 3.9 mm (median 2.8 mm; range 2–11.3 mm) that decreased to 1.7 mm (median 1.2 mm; range 0–7.1 mm) after plaque brachytherapy. On imaging, tumors were pigmented in 51% (n = 86/170), amelanotic in 10% (n = 17/170), and variably pigmented in 39% (n = 67/170). Tumor pigmentation increased in 64% (n = 106/166), decreased in 18% (n = 30/166), and was unchanged in 18% (n = 30/166). Of the 120 that demonstrated intrinsic vascularity, 10% (n = 12/120) had decreased tumor-related vascularity and 90% (n = 108/120) showed complete resolution. Subretinal fluid was present in 34% (n = 58/170) of eyes at presentation. Of them, 15% (9; n = 9/58) had persistent SRF at last follow-up. On ultrasound imaging, 88% (n = 149/170) tumors presented with low to moderate internal reflectivity of which 61% (n = 91/149) showed increased reflectivity on regression. We noted a crescendo–decrescendo fluctuation in the presence of orange pigment lipofuscin along with complete resolution of drusenoid retinal pigment epithelial detachments. In the entire series of 170 patients, there was 0.5% (1) failure of local control, 2% (4) secondary enucleations, and 6% (10) patients developing metastasis. Conclusion: Findings related to choroidal melanoma regression after 103Pd plaque brachytherapy included decreased intrinsic tumor vascularity, decreased tumor-related subretinal fluid, increased pigmentation, specific changes in orange pigment lipofuscin and resolution of drusenoid retinal pigment epithelial detachments, as well as decreased tumor thickness with an increase in internal reflectivity on ultrasound.
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