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Nascimento VA, Malmonge SM, Santos AR. Culture of rat mesenchymal stem cells on PHBV-PCL scaffolds: analysis of conditioned culture medium by FT-Raman spectroscopy. BRAZ J BIOL 2021; 83:e246592. [PMID: 34550283 DOI: 10.1590/1519-6984.246592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 05/13/2021] [Indexed: 11/22/2022] Open
Abstract
Mesenchymal stem cells (MSCs) have great potential for application in cell therapy and tissue engineering procedures because of their plasticity and capacity to differentiate into different cell types. Given the widespread use of MSCs, it is necessary to better understand some properties related to osteogenic differentiation, particularly those linked to biomaterials used in tissue engineering. The aim of this study was to develop an analysis method using FT-Raman spectroscopy for the identification and quantification of biochemical components present in conditioned culture media derived from MSCs with or without induction of osteogenic differentiation. All experiments were performed between passages 3 and 5. For this analysis, MSCs were cultured on scaffolds composed of bioresorbable poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) and poly(ε-caprolactone) (PCL) polymers. MSCs (GIBCO®) were inoculated onto the pure polymers and 75:25 PHBV/PCL blend (dense and porous samples). The plate itself was used as control. The cells were maintained in DMEM (with low glucose) containing GlutaMAX® and 10% FBS at 37oC with 5% CO2 for 21 days. The conditioned culture media were collected and analyzed to probe for functional groups, as well as possible molecular variations associated with cell differentiation and metabolism. The method permitted to identify functional groups of specific molecules in the conditioned medium such as cholesterol, phosphatidylinositol, triglycerides, beta-subunit polypeptides, amide regions and hydrogen bonds of proteins, in addition to DNA expression. In the present study, FT-Raman spectroscopy exhibited limited resolution since different molecules can express similar or even the same stretching vibrations, a fact that makes analysis difficult. There were no variations in the readings between the samples studied. In conclusion, FT-Raman spectroscopy did not meet expectations under the conditions studied.
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Affiliation(s)
- V A Nascimento
- Universidade Federal do ABC, Centro de Ciências Naturais e Humanas - CCNH, São Bernardo do Campo, SP, Brasil
| | - S M Malmonge
- Universidade Federal do ABC, Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, São Bernardo do Campo, SP, Brasil
| | - A R Santos
- Universidade Federal do ABC, Centro de Ciências Naturais e Humanas - CCNH, São Bernardo do Campo, SP, Brasil
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Pereira Viana MR, Martins Alves Melo I, Pupin B, Raniero LJ, de Azevedo Canevari R. Molecular detection of HPV and FT-IR spectroscopy analysis in women with normal cervical cytology. Photodiagnosis Photodyn Ther 2019; 29:101592. [PMID: 31706048 DOI: 10.1016/j.pdpdt.2019.101592] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 10/21/2019] [Accepted: 10/24/2019] [Indexed: 12/12/2022]
Abstract
BACKGROUND The increase in the incidence of Cervical Cancer in the female population worldwide has been an issue that deserves further attention from the scientific community. Several studies have already proven the relationship of its development with the molecular mechanisms that Human Papillomavirus (HPV) induces in cervical cells. The gene amplification provided by molecular biology techniques has been used as the gold standard diagnostic method of this virus because of its high specificity and sensitivity.However, the high investments associated with the acquisition of reagents, equipment and labor demonstrate the need for the development of more accessible techniques that present the same accuracy. FT-IR spectroscopy has been studied as an inexpensive and easily accessible technology that can provide the differentiation of malignant and benign cells. This study aimed to demonstrate the effectiveness and sensitivity of molecular analysis by PCR in relation to cytological analysis and to evaluate the sensitivity of FT-IR spectroscopy in the diagnosis of HPV for cervical cancer prevention. METHODS Cervical fluid samples obtained from 50 patients with absence of cellular lesion by cytological analysis were analyzed by molecular and spectroscopic analyzes. Oncotic colpocitology analysis was performed by the Papanicolaou staining, amplification of the L1 viral gene by PCR was performed using primers MY09 and MY11 and biochemical analysis of the fluids by FT-IR was performed using the Spectrum 400 system equipped with a microscope. RESULTS Of the 50 patients without evident morphological alteration of the cells, seven were diagnosed by molecular analysis as positive for presence of HPV. Principal component analysis of spectroscopy was not able to separate the negative samples from the HPV positive samples and, therefore, did not present as an effective diagnostic technique. CONCLUSIONS We highlight the efficacy, sensitivity and specificity of molecular biology by PCR in the identification of the virus and we emphasize that more studies should be used for the application of FT-IR spectroscopy in the diagnosis of this infection and its application in the prevention of cervical cancer.
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Affiliation(s)
- Magda Rogéria Pereira Viana
- Laboratório de Biologia Molecular do Câncer, Universidade do Vale do Paraíba, UNIVAP, Instituto de Pesquisa e Desenvolvimento, Avenida Shishima Hifumi 2911, Urbanova, São José dos Campos, 12244-000, São Paulo, SP, Brazil
| | - Igor Martins Alves Melo
- Laboratório de Biologia Molecular do Câncer, Universidade do Vale do Paraíba, UNIVAP, Instituto de Pesquisa e Desenvolvimento, Avenida Shishima Hifumi 2911, Urbanova, São José dos Campos, 12244-000, São Paulo, SP, Brazil
| | - Breno Pupin
- Laboratório de Biologia Molecular do Câncer, Universidade do Vale do Paraíba, UNIVAP, Instituto de Pesquisa e Desenvolvimento, Avenida Shishima Hifumi 2911, Urbanova, São José dos Campos, 12244-000, São Paulo, SP, Brazil
| | - Leandro José Raniero
- Laboratório de Nanosensores, Universidade do Vale do Paraíba, UNIVAP, Instituto de Pesquisa e Desenvolvimento, Avenida ShishimaHifumi 2911, Urbanova, São José dos Campos, 12244-000, São Paulo, SP, Brazil
| | - Renata de Azevedo Canevari
- Laboratório de Biologia Molecular do Câncer, Universidade do Vale do Paraíba, UNIVAP, Instituto de Pesquisa e Desenvolvimento, Avenida Shishima Hifumi 2911, Urbanova, São José dos Campos, 12244-000, São Paulo, SP, Brazil.
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3
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Raman spectral feature selection using ant colony optimization for breast cancer diagnosis. Lasers Med Sci 2018; 33:1799-1806. [DOI: 10.1007/s10103-018-2544-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 05/17/2018] [Indexed: 11/26/2022]
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Gebrekidan MT, Erber R, Hartmann A, Fasching PA, Emons J, Beckmann MW, Braeuer A. Breast Tumor Analysis Using Shifted-Excitation Raman Difference Spectroscopy (SERDS). Technol Cancer Res Treat 2018; 17:1533033818782532. [PMID: 29991340 PMCID: PMC6048663 DOI: 10.1177/1533033818782532] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 12/13/2017] [Accepted: 05/17/2018] [Indexed: 11/17/2022] Open
Abstract
We used a shifted-excitation Raman difference spectroscopy method for the ex vivo classification of resected and formalin-fixed breast tissue samples as normal (healthy) tissue, fibroadenoma, or invasive carcinoma. We analyzed 8 tissue samples containing invasive carcinoma that were surrounded by normal tissue and 3 tissue samples with fibroadenoma only. We made various measurement sites on various tissue samples, in total 240 measurements for each type of tissue. Although the acquired raw spectra contain enough information to clearly differentiate between normal and tumor (fibroadenoma and invasive carcinoma) tissue, the differentiation between fibroadenoma and invasive carcinoma was possible only after the shifted-excitation Raman difference spectroscopy isolation of pure Raman spectra from the heavily fluorescence interfered raw spectra. We used 784 and 785 nm as excitation wavelengths for the shifted-excitation Raman difference spectroscopy method. The differences in the obtained pure Raman spectra are assigned to the different chemical compositions of normal breast tissue, fibroadenoma, and invasive breast carcinoma. Principal component analysis and linear discriminant analysis showed excellent classification results in the Raman shift range between 1000 and 1800 cm-1. Invasive breast carcinoma was identified with 99.15% sensitivity, and the absence of invasive carcinoma was identified with 90.40% specificity. Tumor tissue in tumor-containing tissue was identified with 100% sensitivity, and the absence of tumor in no-tumor containing tissue was identified with 100% specificity. As gold standard for the determination of the sensitivity and the specificity, we considered the conventional histopathological classification. In summary, shifted-excitation Raman difference spectroscopy could be potentially very useful to support histopathological diagnosis in breast pathology.
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Affiliation(s)
- Medhanie Tesfay Gebrekidan
- Lehrstuhl für Technische Thermodynamik, Friedrich-Alexander-Universität
(FAU), Erlangen-Nürnberg, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT),
Friedrich-Alexander-Universität (FAU), Erlangen-Nürnberg, Germany
- Institut für Thermische Verfahrenstechnik, Umwelt- und
Naturstoffverfahrenstechnik, Technische Universität Bergakademie Freiberg (TUBAF), Freiberg,
Germany
| | - Ramona Erber
- Pathologisches Institut, Friedrich-Alexander-Universität (FAU),
Erlangen-Nürnberg, Germany
| | - Arndt Hartmann
- Pathologisches Institut, Friedrich-Alexander-Universität (FAU),
Erlangen-Nürnberg, Germany
| | - Peter A. Fasching
- Pathologisches Institut, Friedrich-Alexander-Universität (FAU),
Erlangen-Nürnberg, Germany
| | - Julius Emons
- Frauenklinik, Friedrich-Alexander-Universität (FAU), Erlangen-Nürnberg,
Germany
| | - Mathias W. Beckmann
- Frauenklinik, Friedrich-Alexander-Universität (FAU), Erlangen-Nürnberg,
Germany
| | - Andreas Braeuer
- Lehrstuhl für Technische Thermodynamik, Friedrich-Alexander-Universität
(FAU), Erlangen-Nürnberg, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT),
Friedrich-Alexander-Universität (FAU), Erlangen-Nürnberg, Germany
- Institut für Thermische Verfahrenstechnik, Umwelt- und
Naturstoffverfahrenstechnik, Technische Universität Bergakademie Freiberg (TUBAF), Freiberg,
Germany
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de Boer LL, Hendriks BHW, van Duijnhoven F, Peeters-Baas MJTFDV, Van de Vijver K, Loo CE, Jóźwiak K, Sterenborg HJCM, Ruers TJM. Using DRS during breast conserving surgery: identifying robust optical parameters and influence of inter-patient variation. BIOMEDICAL OPTICS EXPRESS 2016; 7:5188-5200. [PMID: 28018735 PMCID: PMC5175562 DOI: 10.1364/boe.7.005188] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 11/11/2016] [Accepted: 11/13/2016] [Indexed: 05/12/2023]
Abstract
Successful breast conserving surgery consists of complete removal of the tumor while sparing healthy surrounding tissue. Despite currently available imaging and margin assessment tools, recognizing tumor tissue at a resection margin during surgery is challenging. Diffuse reflectance spectroscopy (DRS), which uses light for tissue characterization, can potentially guide surgeons to prevent tumor positive margins. However, inter-patient variation and changes in tissue physiology occurring during the resection might hamper this light-based technology. Here we investigate how inter-patient variation and tissue status (in vivo vs ex vivo) affect the performance of the DRS optical parameters. In vivo and ex vivo measurements of 45 breast cancer patients were obtained and quantified with an analytical model to acquire the optical parameters. The optical parameter representing the ratio between fat and water provided the best discrimination between normal and tumor tissue, with an area under the receiver operating characteristic curve of 0.94. There was no substantial influence of other patient factors such as menopausal status on optical measurements. Contrary to expectations, normalization of the optical parameters did not improve the discriminative power. Furthermore, measurements taken in vivo were not significantly different from the measurements taken ex vivo. These findings indicate that DRS is a robust technology for the detection of tumor tissue during breast conserving surgery.
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Affiliation(s)
- Lisanne L. de Boer
- Netherlands Cancer Institute – Antoni van Leeuwenhoek, Amsterdam The Netherlands
| | - Benno H. W. Hendriks
- Philips Research, Eindhoven, The Netherlands
- Biomechanical Engineering Department, Delft University of Technology, Delft, The Netherlands
| | | | | | - Koen Van de Vijver
- Netherlands Cancer Institute – Antoni van Leeuwenhoek, Amsterdam The Netherlands
| | - Claudette E. Loo
- Netherlands Cancer Institute – Antoni van Leeuwenhoek, Amsterdam The Netherlands
| | - Katarzyna Jóźwiak
- Netherlands Cancer Institute – Antoni van Leeuwenhoek, Amsterdam The Netherlands
| | - Henricus J. C. M. Sterenborg
- Netherlands Cancer Institute – Antoni van Leeuwenhoek, Amsterdam The Netherlands
- Academic Medical Center, Department of Biomedical Engineering and Physics, Meibergdreef 9, 1105AZ, Amsterdam, Netherlands
| | - Theo J. M. Ruers
- Netherlands Cancer Institute – Antoni van Leeuwenhoek, Amsterdam The Netherlands
- MIRA Institute, University Twente, The Netherlands
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Fernández P J, Méndez-Sánchez SC, Gonzalez-Correa CA, Miranda DA. Could field cancerization be interpreted as a biochemical anomaly amplification due to transformed cells? Med Hypotheses 2016; 97:107-111. [PMID: 27876116 DOI: 10.1016/j.mehy.2016.10.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Accepted: 10/26/2016] [Indexed: 12/12/2022]
Abstract
Field cancerization is a concept used to explain cellular and molecular alterations in tissue associated to neoplasia and cancer. This effect was proposed by Slaughter in order to explain the development of multiple primary tumors and locally recurrent cancer. The particular changes associated with this effect, in each type of cancer, have been detected even at distances greater than 10cm off the tumor, in areas classified as normal by histopathological studies. Early detection of lung, colon, and ovary cancer has been reported by the use of Partial Wave Microscopy Spectroscopy (PWS) and has been explained in terms of the field cancerization effect. Until now, field cancerization has been studied as a field effect and we hypothesize that it can be understood as an amplifying effect of biochemical abnormalities in cells, which leads us to ask the question: Could field cancerization be interpreted as a biochemical anomaly amplification due to transformed cells? We propose this question because the biochemical changes due to field cancerization alter the dynamics of molecules and cells in abnormal tissues in comparison to normal ones, these alterations modify the interaction of intracellular and extracellular medium, as well as cellular movement. We hypothesize that field cancerization when interpreted as an amplification effect can be used for the early detection of cancer by measuring the change of cell dynamics.
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Affiliation(s)
- Janeth Fernández P
- Universidad Industrial de Santander, Cra 27 Cll 9, Bucaramanga, Colombia
| | - Stelia C Méndez-Sánchez
- Escuela de Química, Universidad Industrial de Santander, Cra 27 Cll 9, Bucaramanga, Colombia
| | | | - David A Miranda
- Universidad Industrial de Santander, Cra 27 Cll 9, Bucaramanga, Colombia.
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Nogueira VC, Raniero L, Costa GB, de Freitas Coelho NPM, Miranda FC, Arisawa EÂL. Comparative Study of Morphometric and Fourier Transform Infrared Spectroscopy Analyses of the Collagen Fibers in the Repair Process of Cutaneous Lesions. Adv Wound Care (New Rochelle) 2016; 5:55-64. [PMID: 26862463 PMCID: PMC4742994 DOI: 10.1089/wound.2015.0641] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Accepted: 05/04/2015] [Indexed: 01/18/2023] Open
Abstract
Objective: Compare the efficacy of light-emitting diode (LED) and therapeutic ultrasound (TUS), combined with a semipermeable dressing (D), at forming collagen in skin lesions by morphometry and Fourier transform infrared spectroscopy (FT-IR). Materials and Methods: Surgical skin wounds (2.5 cm) were created on 84 male Wistar rats divided into four groups (n=21): Group I (Control), Group II (LED), Group III (LED+D), and Group IV (US+D). On days 7, 14, and 21, the tissue samples were removed and divided into two pieces, one was used for histological examination (collagen) and the other for FT-IR. Results: The histomorphometric analysis showed no significant differences among groups for collagen deposition at 7 days. However, at 14 days, more deposition of collagen was noted in the groups LED (p<0.05) and LED+D (p<0.001) than in the control. At 21 days, the groups LED, LED+D, and US+D presented significantly greater deposition of collagen when compared with the control. The FT-IR spectra, at 14 days, LED+D had greater amounts of type I collagen, a better organization of fibers, and greater difference of mean separation between the groups, not observed at 7 and 21 days. Innovation: The histomorphometric and FT-IR analyses suggest that the association of semipermeable dressing to LED therapy and to TUS modulates biological events, increasing fibroblast/collagen response and accelerating dermal maturation. Conclusion: The histomorphometric and FT-IR analyses showed that LED therapy is more efficacious than TUS, when combined with a semipermeable dressing, and induced the collagen production in skin lesions.
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Affiliation(s)
- Veruska Cronemberger Nogueira
- Universidade do Vale do Paraíba, UNIVAP, Teresina, São Paulo, Brazil
- Universidade Estadual do Piauí, UESPI, Teresina, Piauí, Brazil
- Faculdade Integral Diferencial, FACID, Teresina, Piauí, Brazil
| | - Leandro Raniero
- Universidade do Vale do Paraíba, UNIVAP, Teresina, São Paulo, Brazil
| | | | - Nayana Pinheiro Machado de Freitas Coelho
- Universidade do Vale do Paraíba, UNIVAP, Teresina, São Paulo, Brazil
- Universidade Estadual do Piauí, UESPI, Teresina, Piauí, Brazil
- Faculdade Integral Diferencial, FACID, Teresina, Piauí, Brazil
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8
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Tosato M, Orallo D, Ali S, Churio M, Martin A, Dicelio L. Confocal Raman spectroscopy: In vivo biochemical changes in the human skin by topical formulations under UV radiation. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2015; 153:51-8. [DOI: 10.1016/j.jphotobiol.2015.08.030] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Revised: 08/12/2015] [Accepted: 08/30/2015] [Indexed: 12/13/2022]
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Bhattacharjee T, Khan A, Maru G, Ingle A, Krishna CM. A preliminary Raman spectroscopic study of urine: diagnosis of breast cancer in animal models. Analyst 2015; 140:456-66. [DOI: 10.1039/c4an01703j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Analysis of urine by Raman spectroscopy (RS) as an alternative screening and diagnostic tool for breast cancer..
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Affiliation(s)
- T. Bhattacharjee
- Chilakapati Lab
- Advanced Center for Treatment Research and Education in Cancer (ACTREC)
- Tata Memorial Center (TMC)
- Navi-Mumbai
- India
| | - A. Khan
- Chilakapati Lab
- Advanced Center for Treatment Research and Education in Cancer (ACTREC)
- Tata Memorial Center (TMC)
- Navi-Mumbai
- India
| | - G. Maru
- Maru Lab
- ACTREC
- Navi-Mumbai
- India
| | - A. Ingle
- Laboratory Animal Facility
- ACTREC
- Navi-Mumbai
- India
| | - C. Murali Krishna
- Chilakapati Lab
- Advanced Center for Treatment Research and Education in Cancer (ACTREC)
- Tata Memorial Center (TMC)
- Navi-Mumbai
- India
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10
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Dehghani-Bidgoli Z, Baygi MHM, Kabir E, Malekfar R. Developing an Instrument-Independent Algorithm for Raman Spectroscopy: A Case of Cancer Detection. Technol Cancer Res Treat 2014; 13:119-27. [DOI: 10.7785/tcrt.2012.500373] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
One of the problems in the use of Raman spectroscopy for cancer detection in clinical application is the variety of Raman instruments, producing different spectra for the same sample, due to the nature of the measurement system. This prevents the measured spectra from different systems to be compared against one another without appropriate tools and techniques. Therefore, for each instrument one needs to spend considerable amount of time to prepare a set of reference data based on which the future measurements to be interpreted. For early diagnosis of cancer by Raman spectroscopy, there is a need for an algorithm by which such diagnosis can be made by any type of Raman instrument giving rise to the same findings. In the present study we have investigated the detection of breast cancer in three classes of breast samples (normal, benign and cancer) using three different Raman instruments (Almega, Bruker and R3000) to develop an algorithm that, irrespective of the type of Raman instrument, can be applied to the spectra to extract the features necessary to arrive at the same diagnosis. In doing so, we employed different pre-processing methods to eliminate the instrument-dependent effects on the spectra enabling us to fuse such spectra obtained from different instruments. Then, we classified the data using support vector machine (SVM) and multi-layer perception (MLP) to assess the degree to which the employed methods have been able to detect cancer. The results of the study showed that the range and resolution matching using spline interpolation, and noise and fluorescence elimination using wavelet and SNV normalizations were the most sensitive and accurate procedures for eliminating the instrumental specification-based effects and fusing the data from different instruments.
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Affiliation(s)
- Z. Dehghani-Bidgoli
- Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, I. R. Iran
| | - M. H. Miran Baygi
- Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, I. R. Iran
| | - E. Kabir
- Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, I. R. Iran
| | - R. Malekfar
- Department of Basic Sciences, Tarbiat Modares University, Tehran, I. R. Iran
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Donfack P, Grote K, Lerchl A, Materny A. Probing lymphoma infiltration in spleen of AKR/J mice chronically exposed to electromagnetic fields for risk assessment--toward noninvasive modeling. JOURNAL OF BIOPHOTONICS 2013; 6:598-611. [PMID: 22961705 DOI: 10.1002/jbio.201200058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Revised: 07/17/2012] [Accepted: 08/08/2012] [Indexed: 06/01/2023]
Abstract
Using the AKR/J mouse model, the potential of Raman spectroscopy for monitoring lymphoma in predisposed subjects is demonstrated by discriminating lymphoma infiltration in spleens; the relevance of different excitation profiles is shown. Under green excitation with optimal fluorescence bleaching, stronger DNA bands, intensity variations at amide-III and phenylalanine bands, and the behavior of the 1606/1639 cm(-1) doublet correlate with tumorigenesis. Under red excitation, Raman fingerprints with multivariate models help to discriminate AKR/J-mouse histological subtypes: Lymphoblastic lymphoma (LB) is found significantly distant from both separated lymphocytic lymphoma (LL) and healthy spleen; this agrees with histology since LB has well differentiated large lymphoma cells, while LL, with smaller cells similar to normal lymphocytes, usually cannot be discriminated from normal tissue without histoimmunoassays.
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Affiliation(s)
- Patrice Donfack
- School of Engineering and Science - Physics, Jacobs University Bremen, 28759 Bremen, Germany.
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Swiss bare mice: a suitable model for transcutaneous in vivo Raman spectroscopic studies of breast cancer. Lasers Med Sci 2013; 29:325-33. [DOI: 10.1007/s10103-013-1347-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 05/08/2013] [Indexed: 12/31/2022]
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