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Abstract
The Xenopus embryo is a classical vertebrate model for molecular, cellular, and developmental biology. Despite many advantages of this organism, such as large egg size and external development, imaging of early embryonic stages is challenging because of nontransparent cytoplasm. Staining and imaging of thin tissue sections is one way to overcome this limitation. Here we describe a step-by-step protocol that combines cryosectioning of gelatin-embedded embryos with immunostaining and imaging. The purpose of this protocol is to examine various cellular and tissue markers after the manipulation of protein function. This protocol can be performed within a 2-d period and allows detection of many antigens by immunofluorescence.
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Affiliation(s)
- Olga Ossipova
- Department of Cell, Developmental and Regenerative Biology, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Sergei Y Sokol
- Department of Cell, Developmental and Regenerative Biology, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
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Wan J, Zhong X, Xu Z, Gong D, Li D, Xin Z, Ma X, Li W. A decellularized porcine pulmonary valved conduit embedded with gelatin. Artif Organs 2021; 45:1068-1082. [PMID: 33730379 DOI: 10.1111/aor.13955] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 02/27/2021] [Accepted: 03/11/2021] [Indexed: 11/27/2022]
Abstract
To prepare a tissue-engineered pulmonary valved conduit (PVC) with good tensile strength and biocompatibility. Sixty adult porcine PVCs were used to determine the optimal decellularization time. Five juvenile porcine decellularized PVCs and five juvenile porcine crosslinked PVCs were subsequently prepared according to the optimized decellularization and crosslinking methods. All PVCs were implanted into juvenile sheep for 8 months and then were harvested for staining. With a low concentration of detergent (0.25% Triton X-100+0.25% sodium deoxycholate), the decellularization effect on porcine PVCs was complete by 24 hours, and there was minimal damage to the matrix. Gelatin embedding and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) crosslinking improved the biomechanical properties of decellularized PVCs and reduced their immunogenicity. After implantation, the diameter and thickness of the PVCs in the decellularized and crosslinked groups increased significantly. In both groups, the conduits were unobstructed, with soft and smooth inner walls and without thrombosis, ulceration or neoplasia. The valves slightly degenerated with mild to moderate regurgitation. CD31-positive endothelial cells were visible on the inner surface of the conduits and valves. Scattered smooth muscle actin-positive cells were found in the middle layer of the conduit. The percentage of CD4- and CD68-positive cells and the calcium content were highest in decellularized porcine PVCs and lowest in ovine PVCs. The percentage of the matrix that was laminin-positive in decellularized and crosslinked porcine PVCs was lower than it was in ovine PVCs. Gelatin-embedded and EDC-crosslinked porcine PVCs can be "hosted" in sheep, with good biocompatibility, growth potential, and reduced calcification.
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Affiliation(s)
- Juyi Wan
- Department of Cardiovascular Surgery, The Affiliated Hospital of Southwest Medical University, Luzhou, P.R. China.,Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessel Diseases, Beijing, P.R. China.,Cardiovascular and Metabolic Diseases Key Laboratory of Luzhou, Luzhou, P.R. China.,Key Laboratory of Medical Electrophysiology, Ministry of Education and Medical Electrophysiological Key Laboratory of Sichuan Province, (Collaborative Innovation Center for Prevention of Cardiovascular Diseases) Institute of Cardiovascular Research, Southwest Medical University, Luzhou, P.R. China
| | - Xiaolin Zhong
- Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Luzhou, P.R. China.,Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, P.R. China
| | - Zhiwei Xu
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessel Diseases, Beijing, P.R. China
| | - Da Gong
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessel Diseases, Beijing, P.R. China
| | - Diankun Li
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessel Diseases, Beijing, P.R. China
| | - Zhifei Xin
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessel Diseases, Beijing, P.R. China
| | - Xiaolong Ma
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessel Diseases, Beijing, P.R. China
| | - Wenbin Li
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessel Diseases, Beijing, P.R. China
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Gavdush AA, Chernomyrdin NV, Malakhov KM, Beshplav SIT, Dolganova IN, Kosyrkova AV, Nikitin PV, Musina GR, Katyba GM, Reshetov IV, Cherkasova OP, Komandin GA, Karasik VE, Potapov AA, Tuchin VV, Zaytsev KI. Terahertz spectroscopy of gelatin-embedded human brain gliomas of different grades: a road toward intraoperative THz diagnosis. J Biomed Opt 2019; 24:1-5. [PMID: 30729762 PMCID: PMC6988181 DOI: 10.1117/1.jbo.24.2.027001] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 01/11/2019] [Indexed: 05/18/2023]
Abstract
We applied terahertz (THz)-pulsed spectroscopy to study ex vivo the refractive index and absorption coefficient of human brain gliomas featuring different grades, as well as perifocal regions containing both intact and edematous tissues. Glioma samples from 26 patients were considered and analyzed according to further histological examination. In order to fix tissues for the THz measurements, we applied gelatin embedding, which allows for sustaining their THz response unaltered, as compared to that of the freshly excised tissues. We observed a statistical difference between the THz optical constants of intact tissues and gliomas of grades I to IV, while the response of edema was similar to that of tumor. The results of this paper justify a potential of THz technology in the intraoperative label-free diagnosis of human brain gliomas for ensuring the gross-total resection.
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Affiliation(s)
- Arseniy A. Gavdush
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
- Bauman Moscow State Technical University, Moscow, Russia
| | - Nikita V. Chernomyrdin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
- Bauman Moscow State Technical University, Moscow, Russia
| | - Kirill M. Malakhov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
- Bauman Moscow State Technical University, Moscow, Russia
| | | | - Irina N. Dolganova
- Bauman Moscow State Technical University, Moscow, Russia
- Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, Russia
| | | | | | - Guzel R. Musina
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
- Bauman Moscow State Technical University, Moscow, Russia
| | - Gleb M. Katyba
- Bauman Moscow State Technical University, Moscow, Russia
- Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, Russia
| | - Igor V. Reshetov
- Sechenov First Moscow State Medical University, Institute of Regenerative Medicine, Moscow, Russia
| | - Olga P. Cherkasova
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
- Institute of Laser Physics of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Gennady A. Komandin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
| | | | | | | | - Kirill I. Zaytsev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
- Bauman Moscow State Technical University, Moscow, Russia
- Address all correspondence to Kirill I. Zaytsev, E-mail:
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