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Harasymowicz NS, Rashidi N, Savadipour A, Wu CL, Tang R, Bramley J, Buchser W, Guilak F. Single-cell RNA sequencing reveals the induction of novel myeloid and myeloid-associated cell populations in visceral fat with long-term obesity. FASEB J 2021; 35:e21417. [PMID: 33566380 PMCID: PMC8743141 DOI: 10.1096/fj.202001970r] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Revised: 12/29/2020] [Accepted: 01/21/2021] [Indexed: 12/12/2022]
Abstract
Macrophages and other immune cells are important contributors to obesity-associated inflammation; however, the cellular identities of these specific populations remain unknown. In this study, we identified individual populations of myeloid cells found in mouse epididymal/visceral adipose tissue by single-cell RNA sequencing, immunofluorescence, and flow cytometry. Multiple canonical correlation analysis identified 11 unique myeloid and myeloid-associate cell populations. In obese mice, we detected an increased percentage of monocyte-derived pro-inflammatory cells expressing Cd9 and Trem2, as well as significantly decreased percentages of multiple cell populations, including tissue-resident cells expressing Lyve1, Mafb, and Mrc1. We have identified and validated a novel myeloid/macrophage population defined by Ly6a expression, exhibiting both myeloid and mesenchymal characteristics, which increased with obesity and showed high pro-fibrotic characteristics in vitro. Our mouse adipose tissue myeloid cell atlas provides an important resource to investigate obesity-associated inflammation and fibrosis.
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Affiliation(s)
- Natalia S. Harasymowicz
- Department of Orthopaedic Surgery, Washington University in St. Louis, St. Louis, MO, USA
- Shriners Hospitals for Children, St. Louis, MO, USA
- Center of Regenerative Medicine, Washington University in St. Louis, St. Louis, MO, USA
| | - Neda Rashidi
- Department of Orthopaedic Surgery, Washington University in St. Louis, St. Louis, MO, USA
- Shriners Hospitals for Children, St. Louis, MO, USA
- Center of Regenerative Medicine, Washington University in St. Louis, St. Louis, MO, USA
- Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO, USA
| | - Alireza Savadipour
- Department of Orthopaedic Surgery, Washington University in St. Louis, St. Louis, MO, USA
- Shriners Hospitals for Children, St. Louis, MO, USA
- Center of Regenerative Medicine, Washington University in St. Louis, St. Louis, MO, USA
- Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO, USA
| | - Chia-Lung Wu
- Department of Orthopaedic Surgery, Washington University in St. Louis, St. Louis, MO, USA
- Shriners Hospitals for Children, St. Louis, MO, USA
- Center of Regenerative Medicine, Washington University in St. Louis, St. Louis, MO, USA
| | - Ruhang Tang
- Department of Orthopaedic Surgery, Washington University in St. Louis, St. Louis, MO, USA
- Shriners Hospitals for Children, St. Louis, MO, USA
- Center of Regenerative Medicine, Washington University in St. Louis, St. Louis, MO, USA
| | - John Bramley
- Department of Genetics, Washington University in St. Louis, St. Louis, MO, USA
| | - William Buchser
- Department of Genetics, Washington University in St. Louis, St. Louis, MO, USA
| | - Farshid Guilak
- Department of Orthopaedic Surgery, Washington University in St. Louis, St. Louis, MO, USA
- Shriners Hospitals for Children, St. Louis, MO, USA
- Center of Regenerative Medicine, Washington University in St. Louis, St. Louis, MO, USA
- Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO, USA
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Ren W, Guo W, Kang D, Han Z, He J, Xi G, Wang C, Chen J, Li L. Visualization of lymphatic vascular invasion in breast cancer by multiphoton microscopy. Lasers Med Sci 2020; 36:303-309. [PMID: 32681221 DOI: 10.1007/s10103-020-03029-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 04/22/2020] [Indexed: 12/11/2022]
Abstract
Lymphatic vascular invasion (LVI) is regarded as one of the independent factors which affect the prognosis of breast cancer. Once LVI is formed, it indicates the tumor has metastasized or has the possibility of metastasis. In this work, multiphoton microscopy (MPM), which relies on the two-photon excited fluorescence (TPEF) and second harmonic generation (SHG), was applied to identify the typical morphology of LVI and also visualize the histological features of LVI. Furthermore, the pixel density of collagen fibers was extracted as a quantitative parameter to differentiate LVI from the ductal carcinoma in situ (DCIS). By comparing with the corresponding H&E-stained images, it was confirmed that MPM can be used as an auxiliary tool for pathologists to diagnose LVI, and has a possibility for the application in clinical examination.
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Affiliation(s)
- Wenjiao Ren
- Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou, 350007, People's Republic of China
| | - Wenhui Guo
- Department of Breast Surgery, Fujian Medical University Union Hospital, Fuzhou, 350001, People's Republic of China
| | - Deyong Kang
- Department of Pathology, Fujian Medical University Union Hospital, Fuzhou, 350001, People's Republic of China
| | - Zhonghua Han
- Department of Breast Surgery, Fujian Medical University Union Hospital, Fuzhou, 350001, People's Republic of China
| | - Jiajia He
- Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou, 350007, People's Republic of China
| | - Gangqin Xi
- Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou, 350007, People's Republic of China
| | - Chuan Wang
- Department of Breast Surgery, Fujian Medical University Union Hospital, Fuzhou, 350001, People's Republic of China.
| | - Jianxin Chen
- Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou, 350007, People's Republic of China
| | - Lianhuang Li
- Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou, 350007, People's Republic of China.
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Kantere D, Siarov J, De Lara S, Parhizkar S, Olofsson Bagge R, Wennberg Larkö A, Ericson MB. Label‐free laser scanning microscopy targeting sentinel lymph node diagnostics: A feasibility study ex vivo. TRANSLATIONAL BIOPHOTONICS 2020. [DOI: 10.1002/tbio.202000002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Despoina Kantere
- Department of Dermatology and Venereology, Institute of Clinical Sciences University of Gothenburg Gothenburg Sweden
| | - Jan Siarov
- Department of Pathology University of Gothenburg Gothenburg Sweden
| | - Shahin De Lara
- Department of Pathology University of Gothenburg Gothenburg Sweden
| | - Samad Parhizkar
- Department of Pathology University of Gothenburg Gothenburg Sweden
| | - Roger Olofsson Bagge
- Department of Surgery, Institute of Clinical Sciences University of Gothenburg Gothenburg Sweden
| | - Ann‐Marie Wennberg Larkö
- Department of Dermatology and Venereology, Institute of Clinical Sciences University of Gothenburg Gothenburg Sweden
| | - Marica B. Ericson
- Biomedical photonics group, Department of Chemistry and Molecular Biology University of Gothenburg Gothenburg Sweden
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Haluszka D, Lőrincz K, Kiss N, Szipőcs R, Kuroli E, Gyöngyösi N, Wikonkál NM. Diet-induced obesity skin changes monitored by in vivo SHG and ex vivo CARS microscopy. BIOMEDICAL OPTICS EXPRESS 2016; 7:4480-4489. [PMID: 27895989 PMCID: PMC5119589 DOI: 10.1364/boe.7.004480] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 09/26/2016] [Accepted: 09/26/2016] [Indexed: 05/21/2023]
Abstract
Obesity related metabolic syndrome and type 2 diabetes have severe consequences on our skin. Latest developments in nonlinear microscopy allow the use of noninvasive, label free imaging methods, such as second harmonic generation (SHG) and coherent anti-Stokes Raman scattering (CARS), for early diagnosis of metabolic syndrome-related skin complications by 3D imaging of the skin and the connective tissue. Our aim was to study effects of various types of diet-induced obesity in mice using these methods. We examined mice on different diets for 32 weeks. The collagen morphology was evaluated four times in vivo by SHG microscopy, and adipocytes were examined once at the end of experiment by ex vivo CARS method. A strong correlation was found between the body weight and the adipocyte size, while we found that the SHG intensity of dermal collagen reduces considerably with increasing body weight. Obese mice on high-fat diet showed worse results than those on high-fat - high-fructose diet. Animals on high-fructose diet did not gain more weight than those on ordinary diet despite of the increased calorie intake, but their collagen damage was nonetheless significant. Obesity and high sugar intake damages the skin, mainly the dermal connective tissue and subcutaneous adipose tissue, which efficiently can be monitored by in vivo SHG and ex vivo CARS microscopy.
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Affiliation(s)
- Dóra Haluszka
- Semmelweis University, Department of Dermatology, Venereology and Dermatooncology, Budapest, Hungary
- Institute for Solid State Physics and Optics of Wigner RCP, Budapest, Hungary
| | - Kende Lőrincz
- Semmelweis University, Department of Dermatology, Venereology and Dermatooncology, Budapest, Hungary
| | - Norbert Kiss
- Semmelweis University, Department of Dermatology, Venereology and Dermatooncology, Budapest, Hungary
- Institute for Solid State Physics and Optics of Wigner RCP, Budapest, Hungary
| | - Róbert Szipőcs
- Institute for Solid State Physics and Optics of Wigner RCP, Budapest, Hungary
- R&D Ultrafast Lasers Ltd, Budapest, Hungary
| | - Enikő Kuroli
- Semmelweis University, Department of Dermatology, Venereology and Dermatooncology, Budapest, Hungary
| | - Nóra Gyöngyösi
- Semmelweis University, Department of Dermatology, Venereology and Dermatooncology, Budapest, Hungary
| | - Norbert M. Wikonkál
- Semmelweis University, Department of Dermatology, Venereology and Dermatooncology, Budapest, Hungary
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Xu Y, Liao C, Chen J, Chen Y, Zhu X, Chen J. Two-photon excited fluorescence imaging of the pancreatic solid pseudopapillary tumor without hematoxylin and eosin stains. SCANNING 2016; 38:245-250. [PMID: 26331487 DOI: 10.1002/sca.21267] [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: 07/02/2015] [Revised: 08/13/2015] [Accepted: 08/21/2015] [Indexed: 06/05/2023]
Abstract
Solid pseudopapillary tumor (SPT) of the pancreas is an epithelial tumor with low-grade malignant potential and present more common in females. At present, the gold standard for accurate diagnosis of pancreatic tumor was mostly depending on the pathological and/or cytological evaluation. In this work, TPEF microscopy was applied to obtain the images of human normal pancreas and SPT of the pancreas without hematoxylin and eosin (H&E) staining, for the purpose of identifying the organization structural, cell morphological, and cytoplasm changing, which were then compared to their corresponding H&E stained histopathological results. Our results showed that high-resolution TPEF imaging of the pancreatic SPT can clearly distinguish the pathological features from normal pancreas in unstained histological sections, and the results are consistent with the histological results. Moreover, we measured the nuclear-cytoplasmic ratios of the pancreatic SPT and normal pancreas to characterize their difference in the cytomorphological feature. It indicated that this technique can achieve the consistent information of pathological diagnosis, and has the potential to substantially improve the optical diagnosis and treatment of the pancreatic SPT without H&E staining in the future. SCANNING 38:245-250, 2016. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Yahao Xu
- Institute of Laser and Optoelectronics Technology, Fujian Provincial Key Laboratory for Photonics Technology, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou, P. R. China
| | - Chenxi Liao
- Institute of Laser and Optoelectronics Technology, Fujian Provincial Key Laboratory for Photonics Technology, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou, P. R. China
| | - Jing Chen
- Institute of Laser and Optoelectronics Technology, Fujian Provincial Key Laboratory for Photonics Technology, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou, P. R. China
| | - Youting Chen
- Department of Hepatopancreatobiliary Surgery and Institute of Abdominal Surgery, The First Affiliated Hospital of Fujian Medical University, Fuzhou, P. R. China
| | - Xiaoqin Zhu
- Institute of Laser and Optoelectronics Technology, Fujian Provincial Key Laboratory for Photonics Technology, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou, P. R. China
| | - Jianxin Chen
- Institute of Laser and Optoelectronics Technology, Fujian Provincial Key Laboratory for Photonics Technology, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou, P. R. China
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Li L, Chen Z, Wang X, Li H, Jiang W, Zhuo S, Guan G, Chen J. Detection of morphologic alterations in rectal carcinoma following preoperative radiochemotherapy based on multiphoton microscopy imaging. BMC Cancer 2015; 15:142. [PMID: 25885576 PMCID: PMC4373096 DOI: 10.1186/s12885-015-1157-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 03/03/2015] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Preoperative radiochemotherapy improves outcomes in patients with locally advanced rectal carcinoma, and has been used increasingly in patient management. However, there is a strong clinical need to assess tumor response to neoadjuvant treatment, and a non-invasive technique that allows the precise identification of morphologic changes in tumors would be of considerable clinical interest. METHODS In this study, we used multiphoton microscopy (MPM) to detect morphologic alterations in rectal adenocarcinomas in patients treated with preoperative radiochemotherapy. RESULTS MPM was able to identify histopathologic alterations in rectal cancer following preoperative radiochemotherapy, and allowed the qualitative assessment of treatment efficacy and feasibility in relation to dose or strategy. CONCLUSION These findings may provide the groundwork for evaluating tumor response to neoadjuvant treatment, thus allowing the tailoring of effective treatment doses and strategies.
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Affiliation(s)
- Lianhuang Li
- Institute of Laser and Optoelectronics Technology, Fujian Provincial Key Laboratory for Photonics Technology, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou, 350007, China.
| | - Zhifen Chen
- Department of Colorectal Surgery, The Affiliated Union Hospital, Fujian Medical University, Fuzhou, 350001, China.
| | - Xingfu Wang
- Department of Pathology, The First Affiliated Hospital, Fujian Medical University, Fuzhou, 350001, China.
| | - Hongsheng Li
- Institute of Laser and Optoelectronics Technology, Fujian Provincial Key Laboratory for Photonics Technology, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou, 350007, China.
| | - Weizhong Jiang
- Department of Colorectal Surgery, The Affiliated Union Hospital, Fujian Medical University, Fuzhou, 350001, China.
| | - Shuangmu Zhuo
- Institute of Laser and Optoelectronics Technology, Fujian Provincial Key Laboratory for Photonics Technology, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou, 350007, China.
| | - Guoxian Guan
- Department of Colorectal Surgery, The Affiliated Union Hospital, Fujian Medical University, Fuzhou, 350001, China.
| | - Jianxin Chen
- Institute of Laser and Optoelectronics Technology, Fujian Provincial Key Laboratory for Photonics Technology, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou, 350007, China.
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Vargas G, Chandalia M, Jiang Y, Davila H, Motamedi M, Abate N. Heterogeneity in subcutaneous adipose tissue morphology and metabolic complications in overweight and obese women. Metab Syndr Relat Disord 2013; 11:276-82. [PMID: 23621112 DOI: 10.1089/met.2013.0024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVE The aim of this study was to assess morphological features of intact adipose tissue (AT) ex vivo from both subcutaneous (s.c.) abdominal and gluteal areas using a novel approach of multiphoton autofluorescence microscopy (MPAM) combined with second harmonic generation microscopy (SHGM), and to assess the relationship between morphological features in the two AT sites and insulin resistance to peripheral glucose disposal. METHOD This study was a cross-sectional evaluation of AT morphology feature and peripheral insulin resistance. SUBJECTS Fourteen overweight/obese premenopausal women underwent body composition studies, hyperinsulinemic-euglycemic clamps, and needle biopsy of both the s.c. abdominal and gluteal AT areas. MPAM combined with SHGM was used to measure adipocyte maximal diameter and collagen fiber bundle thickness within a sampled image volume after three-dimensional visualization. RESULTS Higher body mass index (BMI) was associated with larger adipocyte diameter in s.c. abdominal, but not gluteal, AT. Higher adipocyte diameter was associated with higher pericellular collagen thickness. Adipocyte diameter in s.c. abdominal, but not gluteal, AT was associated positively with leptin and negatively with adiponectin plasma levels and peripheral glucose disposal rate. The latter correlation was no longer significant after adjustment for collagen thickness. CONCLUSION In overweight/obese premenopausal women, larger adipocyte diameter in s.c. abdominal, but not gluteal, AT associates with low plasma adiponectin and systemic insulin resistance, and suggests that increased collagen thickness (obesity-related scarring) could contribute to these findings.
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Affiliation(s)
- Gracie Vargas
- Center for Biomedical Engineering, Department of Neuroscience and Cell Biology, University of Texas Medical Branch at Galveston, Galveston, Texas, USA
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Tsai CK, Wang TD, Lin JW, Hsu RB, Guo LZ, Chen ST, Liu TM. Virtual optical biopsy of human adipocytes with third harmonic generation microscopy. BIOMEDICAL OPTICS EXPRESS 2013; 4:178-86. [PMID: 23304657 PMCID: PMC3539194 DOI: 10.1364/boe.4.000178] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Revised: 11/19/2012] [Accepted: 11/21/2012] [Indexed: 05/08/2023]
Abstract
Using the sectioning capability of third harmonic generation (THG) microscopy, we assessed the morphologic features of human adipocytes directly without fixation and labeling. At the plane of the largest cross-sectional area, both area-equivalent circular diameters (AECD) and perimeters of adipocytes were measured, and their statistical distributions were examined. We found, in patients with no cardiovascular risk factors, the average AECD of epicardial adipocytes were 70-90 μm with 11-17 μm standard deviations. In contrast, for patients with coronary artery disease, amounts of small-sized (AECD <40 µm) epicardial adipocytes were observed and the corresponding standard deviations of AECD were increased to 20-29 μm. Our results indicate that the THG tomography platform can be used to explore the histopathological features of adipocytes in clinical scenarios based on its superior resolution for virtual optical biopsy.
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Affiliation(s)
- Cheng-Kun Tsai
- Institute of Biomedical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Tzung-Dau Wang
- Division of Cardiology, Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei 10617, Taiwan
- Cardiovascular Center and Department of Internal Medicine, National Taiwan University Hospital Yun-Lin Branch, Yun-Lin County 64041, Taiwan
- Molecular Imaging Center, National Taiwan University, Taipei 10617, Taiwan
| | - Jong-Wei Lin
- Division of Cardiology, Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei 10617, Taiwan
| | - Ron-Bin Hsu
- Department of Surgery, National Taiwan University Hospital, Taipei 10048, Taiwan
| | - Lun-Zhang Guo
- Institute of Biomedical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - San-Tai Chen
- Institute of Biomedical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Tzu-Ming Liu
- Institute of Biomedical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Molecular Imaging Center, National Taiwan University, Taipei 10617, Taiwan
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Huang Z, Pan J, Chen G, Li Z, Chen X, Li Y, Wang J, Chen R. Fractal analysis of two-photon microscopic images for diagnosis of nasopharyngeal cancer. SCANNING 2012; 34:399-403. [PMID: 22552959 DOI: 10.1002/sca.21023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Accepted: 03/12/2012] [Indexed: 05/31/2023]
Abstract
In this study, two-photon microscopy (TPM) was applied to obtain high-resolution, optically sectioned images with cellular morphology information from normal and cancerous nasopharyngeal tissue. Notable difference of nuclear-cytoplasmic ratio was found between these two groups. In particular, fractal dimension (FD) analysis based on TPM images showed good differentiation between normal and cancerous nasopharyngeal tissues. Our results indicate that TPM coupled with FD analysis methods has the potential to extract diagnostic features for label-free histological diagnosis.
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Affiliation(s)
- Zufang Huang
- Key Laboratory of Opto-Electronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou, People's Republic of China
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Lv T, Huang ZF, Wang HW, Lin JQ, Chen GN, Chen XW, Chen R, Huang Z, Wang XL. Evaluation of collagen alteration after topical photodynamic therapy (PDT) using second harmonic generation (SHG) microscopy--in vivo study in a mouse model. Photodiagnosis Photodyn Ther 2012; 9:164-9. [PMID: 22594987 DOI: 10.1016/j.pdpdt.2011.12.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2011] [Revised: 12/03/2011] [Accepted: 12/10/2011] [Indexed: 12/19/2022]
Abstract
Topical photodynamic therapy (PDT) mediated by 5-aminolevulinic acid (ALA) has been used for the treatment of age-related skin lesions for therapeutic or cosmetic purposes. The modulation of collagen component and structure might play a significant role in influencing treatment outcomes of PDT. In this study, the effect of multi-session low dose ALA PDT on skin rejuvenation was examined in a hairless mouse model. Changes in collagen and skin texture were investigated by histological examination and in vivo second harmonic generation (SHG) microscopy. Results indicated that multi-session PDT could improve the collagen density and arrangement of skin tissue. SHG microscopy combined with quantitative collagen analysis could provide a useful tool for the evaluation of collagen alteration induced by ALA PDT.
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Affiliation(s)
- Ting Lv
- Shanghai Skin Diseases Hospital, Shanghai 200050, PR China
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