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Bright OA, Samuel DN, Adisa MA, Dorcas OO, Perez Q, Melody AA, Michael AK, Albert OS, Senu E. Clearing Properties Between Coconut Oil and Xylene in Histological Tissue Processing. J Histochem Cytochem 2024; 72:233-243. [PMID: 38553997 PMCID: PMC11020745 DOI: 10.1369/00221554241241369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 02/20/2024] [Indexed: 04/16/2024] Open
Abstract
Xylene is the commonest clearing agent even though it is hazardous and costly. This study evaluated the clearing properties of coconut oil as an alternative cost-effective clearing agent for histological processes. Ten (10) prostate samples fixed in formalin were taken and each one was cut into 4 before randomly separating them into four groups (A, B, C and D). Tissues were subjected to ascending grades of alcohol for dehydration. Group A was cleared in xylene and Groups B, C, and D were cleared at varying times of 1hr 30mins, 3hrs, and 4hrs in coconut oil respectively before embedding, sectioning, and staining were carried out. Gross and histological features were compared. Results indicated a significant shrinkage in coconut oil-treated specimen compared with the xylene-treated specimen and only the tissues cleared in coconut oil for 4hrs were as rigid as the tissues cleared in xylene (p > 0.05). No significant difference was found in either of the sections when checked for cellular details and staining quality (p > 0.999). Coconut oil is an efficient substitute for xylene in prostate tissues with a minimum clearing time of 4hrs, as it is environmentally friendly and less expensive, but causes significant shrinkage to prostate tissue.
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Affiliation(s)
- Owusu Afriyie Bright
- Department of Medical Laboratory Technology, Garden City University College, Kumasi, Ghana
- Department of Medical Laboratory Science, University of Energy and Natural Resources, Sunyani, Ghana
- Department of Molecular Medicine, School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Darko Nkansah Samuel
- Department of Molecular Medicine, School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Musah Ayeley Adisa
- Department of Biological Sciences, University of Energy and Natural Resources, Sunyani, Ghana
| | - Owusu Ohui Dorcas
- Department of Biological Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Quartey Perez
- Department of Medical Laboratory Technology, Garden City University College, Kumasi, Ghana
| | - Antwi Ama Melody
- Department of Medical Laboratory Technology, Garden City University College, Kumasi, Ghana
- Department of Molecular Medicine, School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Addai Kusi Michael
- Department of Medical Laboratory Technology, Garden City University College, Kumasi, Ghana
- Department of Medical Laboratory, Pathology Unit, HopeXchange Medical Centre, Kumasi, Ghana
| | - Osei Sarpong Albert
- Department of Medical Laboratory Technology, Garden City University College, Kumasi, Ghana
| | - Ebenezer Senu
- Department of Molecular Medicine, School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
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Schlein E, Syvänen S, Rokka J, Gustavsson T, Rossin R, Robillard M, Eriksson J, Sehlin D. Functionalization of Radiolabeled Antibodies to Enhance Peripheral Clearance for High Contrast Brain Imaging. Mol Pharm 2022; 19:4111-4122. [PMID: 36201682 PMCID: PMC9644377 DOI: 10.1021/acs.molpharmaceut.2c00536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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Small molecule imaging
agents such as [11C]PiB, which
bind to the core of insoluble amyloid-β (Aβ) fibrils,
are useful tools in Alzheimer’s disease (AD) research, diagnostics,
and drug development. However, the [11C]PiB PET signal
saturates early in the disease progression and does not detect soluble
or diffuse Aβ pathology which are believed to play important
roles in the disease progression. Antibodies, modified into a bispecific
format to enter the brain via receptor-mediated transcytosis, could
be a suitable alternative because of their diversity and high specificity
for their target. However, the circulation time of these antibodies
is long, resulting in an extended exposure to radiation and low imaging
contrast. Here, we explore two alternative strategies to enhance imaging
contrast by increasing clearance of the antibody ligand from blood.
The bispecific Aβ targeting antibody RmAb158-scFv8D3 and the
monospecific RmAb158 were radiolabeled and functionalized with either
α-d-mannopyranosylphenyl isothiocyanate (mannose) or
with trans-cyclooctene (TCO). While mannose can directly
mediate antibody clearance via the liver, TCO-modified antibody clearance
was induced by injection of a tetrazine-functionalized, liver-targeting
clearing agent (CA). In vivo experiments in wild type and AD transgenic
mice demonstrated the ability of both strategies to drastically shorten
the circulation time of RmAb158, while they had limited effect on
the bispecific variant RmAb158-8D3. Furthermore, single photon emission
computed tomography imaging with TCO-[125I]I-RmAb158 in
AD mice showed higher contrast 1 day after injection of the tetrazine-functionalized
CA. In conclusion, strategies to enhance the clearance of antibody-based
imaging ligands could allow imaging at earlier time points and thereby
open the possibility to combine antibodies with short-lived radionuclides
such as fluorine-18.
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Affiliation(s)
- Eva Schlein
- Department of Public Health and Caring Sciences, Uppsala University, 751 85 Uppsala, Sweden
| | - Stina Syvänen
- Department of Public Health and Caring Sciences, Uppsala University, 751 85 Uppsala, Sweden
| | - Johanna Rokka
- Department of Public Health and Caring Sciences, Uppsala University, 751 85 Uppsala, Sweden
| | - Tobias Gustavsson
- Department of Public Health and Caring Sciences, Uppsala University, 751 85 Uppsala, Sweden
| | - Raffaella Rossin
- Tagworks Pharmaceuticals, Toernooiveld 1, 6525 ED Nijmegen, Netherlands
| | - Marc Robillard
- Tagworks Pharmaceuticals, Toernooiveld 1, 6525 ED Nijmegen, Netherlands
| | - Jonas Eriksson
- PET Centre, Uppsala University Hospital, 751 85 Uppsala, Sweden.,Department of Medicinal Chemistry, Uppsala University, 751 23 Uppsala, Sweden
| | - Dag Sehlin
- Department of Public Health and Caring Sciences, Uppsala University, 751 85 Uppsala, Sweden
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Thamilselvan S, Sherlin HJ, Jayaraj G, Don KR, Santhanam A. Cedarwood oil as an alternative to xylene as a clearing agent in histopathological tissue processing - A comparative study. J Oral Maxillofac Pathol 2021; 25:299-305. [PMID: 34703125 PMCID: PMC8491330 DOI: 10.4103/0973-029x.325232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 06/07/2021] [Accepted: 07/05/2021] [Indexed: 11/05/2022] Open
Abstract
Background: Clearing in histopathological tissue processing should be able to make the tissues translucent and clear for the tissues to be visible under light microscopy and should render the clearing agent to be miscible with the dehydrant and the impregnation wax in the preceding and following processing steps. Xylene is a gold standard clearing agent but increasing concerns about the potential carcinogenicity, implementing eco-friendly agents in routine histopathology is necessary. Aim: The aim of the study is to assess the clearing ability of Cedarwood oil as an alternative to Xylene in routine tissue processing. Materials & Methods: The study was carried out in the Department of Oral Pathology and Microbiology. Formalin fixed 50 tissue samples of size 3-7mm were taken and subsequent dehydration done with acetone and alcohol. The dehydrated tissue is later processed using 90ml of Cedarwood oil with few drops of Xylene and Thymol. After clearing the tissues were subjected to impregnation and embedded in paraffin wax, later which sections were made and stained using H & E stain. Results: The results of our study on comparison showed better outcome in tissues processed with cedarwood oil than xylene. Statistical Significant correlation was observed in nuclear staining (p value = 0.001) ; cytoplasmic staining (p value = 0.08) and background staining ( p value = 0.045) indicating a positive results on using cedarwood oil as clearing agent. Conclusion: The cedarwood oil can be considered as a safer natural alternative to xylene in laboratories. The cedarwood oil is eco - friendly and easily available with enhanced tissue processing qualities.
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Affiliation(s)
- Snega Thamilselvan
- Department of Oral Pathology and Microbiology, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College and Hospitals, Saveetha University, Chennai, Tamil Nadu, India
| | - Herald J Sherlin
- Department of Oral Pathology and Microbiology, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College and Hospitals, Saveetha University, Chennai, Tamil Nadu, India
| | - Gifrina Jayaraj
- Department of Oral Pathology and Microbiology, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College and Hospitals, Saveetha University, Chennai, Tamil Nadu, India
| | - K R Don
- Department of Oral Pathology and Microbiology, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College and Hospitals, Saveetha University, Chennai, Tamil Nadu, India
| | - Archana Santhanam
- Department of Oral Pathology and Microbiology, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College and Hospitals, Saveetha University, Chennai, Tamil Nadu, India
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Dineshshankar J, Saranya M, Tamilthangam P, Swathiraman J, Shanmathee K, Preethi R. Kerosene as an Alternative to Xylene in Histopathological Tissue Processing and Staining: An Experimental Study. J Pharm Bioallied Sci 2019; 11:S376-S379. [PMID: 31198372 PMCID: PMC6555370 DOI: 10.4103/jpbs.jpbs_38_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Background Conventional tissue processing is as old as 100 years and still remains the gold standard. Tissue processing involves many steps, of which one of the important steps is clearing. Xylene is one of the common clearing agents used in laboratory, but it is carcinogenic and teratogenic. Aim The aim of this study was to substitute conventionally used xylene with kerosene in tissue processing and staining. Materials and Methods Thirty bits of chicken tissue samples were collected; each was randomly separated into two groups: tissue processing and staining. Instead of conventional xylene, we used kerosene. The tissue blocks were subjected to sectioning and staining, and finally, they were observed under light microscope. Results Tissue samples that were processed and cleared with kerosene showed equal clearing and staining without any alterations of the tissue morphology and cellular details with that of xylene. Conclusion Kerosene can be used as a substitute to xylene without posing any health risk or compromising the cellular integrity.
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Affiliation(s)
- Janardhanam Dineshshankar
- Department of Oral Pathology and Microbiology, Vivekanandha Dental College for Women, Namakkal, Tamil Nadu, India
| | - Manikandan Saranya
- Department of Oral Pathology and Microbiology, Vivekanandha Dental College for Women, Namakkal, Tamil Nadu, India
| | - Periyasamy Tamilthangam
- Department of Oral Pathology and Microbiology, Vivekanandha Dental College for Women, Namakkal, Tamil Nadu, India
| | - Jeyaraman Swathiraman
- Department of Oral Pathology and Microbiology, Vivekanandha Dental College for Women, Namakkal, Tamil Nadu, India
| | - Kumaravel Shanmathee
- Department of Oral Pathology and Microbiology, Vivekanandha Dental College for Women, Namakkal, Tamil Nadu, India
| | - Ravichandran Preethi
- Department of Oral Pathology and Microbiology, Vivekanandha Dental College for Women, Namakkal, Tamil Nadu, India
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Dou S, Virostko J, Rusckowski M, Greiner DL, Powers AC, Liu G. Differentiation between temporary and real non-clearability of biotinylated IgG antibody by avidin in mice. Front Pharmacol 2014; 5:172. [PMID: 25104938 PMCID: PMC4109569 DOI: 10.3389/fphar.2014.00172] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 07/02/2014] [Indexed: 11/23/2022] Open
Abstract
Although an increasing number of antibody conjugates are being used in the clinic, there remain many unmet needs in antibody targeting. Normal tissue background is one of the key issues that limits the therapeutic efficacy and the detection sensitivity. Background reduction coupled with dose increase may provide the required target accumulation of the label or toxin at an acceptable normal tissue background. However, the knowledge about the in vivo interaction between antibody and a clearing agent is currently inadequate for designing a rational clearance regimen or system. The current investigation focuses on the clearability of antibody for background reduction, an important topic to antibody targeting in general. The investigation employs pretargeting as a research tool and avidin as a model clearing agent. By comparing the effects of natural clearance at a longer post-injection time and avidin clearance, we demonstrated that avidin clearance is much more effective. By directly attaching avidin to a biotinylated antibody prior to injection, we found that the biotinylated antibody in blood, once bound to the clearing agent, can be removed from the circulation immediately and completely, while the real non-clearable antibody without biotin stays. The study of multiple avidin injections confirmed that the presence of clearable biotinylated antibodies after an avidin injection is due to their temporary inaccessibility and subsequent return from tissue compartments. The collective clearance efficiency of 91% by three avidin injections indicates a continuous IV infusion would be recommended to remove all of the biotinylated IgG molecules. In conclusion, the use of antibody pretargeting as a tool in this study has improved understanding of the incomplete clearance by avidin and can aid in overcoming this obstacle.
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Affiliation(s)
- Shuping Dou
- Department of Radiology, University of Massachusetts Medical School Worcester, MA, USA
| | - John Virostko
- Vanderbilt University Institute of Imaging Science, Vanderbilt University Nashville, TN, USA
| | - Mary Rusckowski
- Department of Radiology, University of Massachusetts Medical School Worcester, MA, USA
| | - Dale L Greiner
- Department of Molecular Medicine, University of Massachusetts Medical School Worcester, MA, USA
| | - Alvin C Powers
- Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Vanderbilt University Nashville, TN, USA ; Department of Molecular Physiology and Biophysics, Vanderbilt University Nashville, TN, USA ; Veterans Affairs Tennessee Valley Healthcare System Nashville, TN, USA
| | - Guozheng Liu
- Department of Radiology, University of Massachusetts Medical School Worcester, MA, USA
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Rossin R, Läppchen T, van den Bosch SM, Laforest R, Robillard MS. Diels-Alder reaction for tumor pretargeting: in vivo chemistry can boost tumor radiation dose compared with directly labeled antibody. J Nucl Med 2013; 54:1989-95. [PMID: 24092936 DOI: 10.2967/jnumed.113.123745] [Citation(s) in RCA: 130] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
UNLABELLED Current pretargeting systems use noncovalent biologic interactions, which are prone to immunogenicity. We previously developed a novel approach based on the bioorthogonal reaction between a radiolabeled tetrazine and an antibody-conjugated trans-cyclooctene (TCO). However, the tumor-to-blood ratio was low due to reaction with freely circulating antibody-TCO. METHODS Here we developed 2 tetrazine-functionalized clearing agents that enable rapid reaction with and removal of a TCO-tagged antibody (CC49) from blood. Next, we incorporated this approach into an optimized pretargeting protocol in LS174T-bearing mice. Then we compared the pretargeted (177)Lu-labeled tetrazine with (177)Lu-labeled CC49. The biodistribution data were used for mouse and human dosimetry calculations. RESULTS The use of a clearing agent led to a doubling of the tetrazine tumor uptake and a 125-fold improvement of the tumor-to-blood ratio at 3 h after tetrazine injection. Mouse dosimetry suggested that this should allow for an 8-fold higher tumor dose than is possible with nonpretargeted radioimmunotherapy. Also, humans treated with CC49-TCO-pretargeted (177)Lu-tetrazine would receive a dose to nontarget tissues 1 to 2 orders of magnitude lower than with directly labeled CC49. CONCLUSION The in vivo performance of chemical pretargeting falls within the range of results obtained for the clinically validated pretargeting approaches in mice, with the advantage of potentially allowing for fractionated radiotherapy as a result of a lower likelihood of immunogenicity. These findings demonstrate that biologic pretargeting concepts can be translated to rapid bioorthogonal chemical approaches with retained potential.
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Affiliation(s)
- Raffaella Rossin
- Department of Minimally Invasive Healthcare, Philips Research, Eindhoven, The Netherlands; and
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Kunhua W, Chuming F, Tao L, Yanmei Y, Xin Y, Xiaoming Z, Xuezhong G, Xun L. A novel non-toxic xylene substitute (SBO) for histology. Afr J Tradit Complement Altern Med 2012; 9:43-9. [PMID: 23983318 DOI: 10.4314/ajtcam.v9i1.6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Xylene has been generally used as a clearing and deparaffinizing agent in histology. Because of the potential toxic and flammable nature of xylene, its substitutes have been introduced into some laboratories. In this study, we introduced a novel, non-toxic xylene substitute (SBO), which was generated through a mixture of 86% of white oil No.2 and 14% of N-heptane. SBO had a high boiling point (188°C) and flash point (144°C) coupled with a scentless and decreased volatility. To compare the effectiveness of SBO and xylene in histology, a wide range of tissue samples from rats and human beings were processed in parallel in SBO and xylene, subjected to various staining procedures. Similar to the xylene-processed paraffin blocks, the SBO-processed counterparts were easy to section without any evidence of cell shrinkage. Assessment of the SBO-treated sections stained with hematoxylin-eosin revealed a good maintenance of cell morphology and structure, and a clear definition of the cytoplasm and the nucleus. Moreover, comparable good results were achieved between the SBO- and xylene-processed tissues in other histochemical and immunohistochemical stainings. Six-month clinical applications at one department of pathology supported the potentials of SBO as a xylene substitute. In conclusion, we suggest that SBO is a safe and efficient substitute of xylene and may probably replace xylene without losing valuable diagnostic information.
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Affiliation(s)
- Wang Kunhua
- The First People's Hospital of Yunnan Province, Kunming 650032, PR China
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