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Kamiie J, Aihara N, Uchida Y, Kobayashi D, Yoshida Y, Kuroda T, Sakaue M, Sugihara Y, Rezeli M, Marko-Varga G. Amyloid-specific extraction using organic solvents. MethodsX 2020; 7:100770. [PMID: 32140436 PMCID: PMC7046812 DOI: 10.1016/j.mex.2019.100770] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 12/12/2019] [Indexed: 11/25/2022] Open
Abstract
Typing of amyloidosis by mass spectrometry (MS) based proteomic analysis contribute to the diagnosis of amyloidosis. For MS analysis, laser microdissection (LMD) is used for amyloid specific sampling. This study aimed to establish a method for selectively extracting amyloids from formalin-fixed, paraffin-embedded (FFPE) specimens by organic solvent instead of LMD. The extracts using dimethyl sulfoxide (DMSO), dimethylformamide (DMF), methanol, trifluoroethanol (TFE) or hexafluoro-2-propanol from FFPE brain of alzheimer's disease mouse model generated protein bands on SDS-PAGE, and Aβ was identified in the extract of DMF using mass spectrometry. The extract using DMSO from the kidney of a AA amyloidosis patient produced a protein band in SDS-PAGE. This protein band was identified to be serum amyloid A (SAA) by Western blotting and mass spectrometry. Circular dichroism spectrometry revealed that the secondary structures of Aβ and transthyretin were converted to α-helices from β-sheets in TFE. Our results suggest that organic solvents can extract amyloids from FFPE specimens by converting their secondary structure. This method could eliminate the LMD step and simplified amyloid typing by MS analysis. •DMSO, DMF, methanol, TFE and HFIP can extract Aβ specifically from the FFPE brain of a Alzheimer' disease mouse model.•DMSO can extract SAA specifically from a FFPE section of AA amyloidosis.•Secondary structures of Aβ and transthyretin converted from β-sheet to α-helix in TFE.
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Affiliation(s)
- Junichi Kamiie
- Laboratory of Veterinary Pathology, School of Veterinary Medicine, Azabu University, Sagamihara, Japan
| | - Naoyuki Aihara
- Laboratory of Veterinary Pathology, School of Veterinary Medicine, Azabu University, Sagamihara, Japan
| | - Yu Uchida
- Laboratory of Veterinary Pathology, School of Veterinary Medicine, Azabu University, Sagamihara, Japan
| | - Daiki Kobayashi
- Omics Unit, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Yutaka Yoshida
- Department of Structural Pathology, Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Takeshi Kuroda
- Division of Clinical Nephrology and Rheumatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Motoharu Sakaue
- Laboratory of Veterinary Anatomy II, School of Veterinary Medicine, Azabu University, Sagamihara, Japan
| | - Yutaka Sugihara
- Division of Clinical Protein Science & Imaging, Department of Biomedical Engineering, Lund University, Lund, Sweden
| | - Melinda Rezeli
- Division of Clinical Protein Science & Imaging, Department of Biomedical Engineering, Lund University, Lund, Sweden
| | - György Marko-Varga
- Division of Clinical Protein Science & Imaging, Department of Biomedical Engineering, Lund University, Lund, Sweden
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Yanagisawa A, Ueda M, Sueyoshi T, Nakamura E, Tasaki M, Suenaga G, Motokawa H, Toyoshima R, Kinoshita Y, Misumi Y, Yamashita T, Sakaguchi M, Westermark P, Mizuta H, Ando Y. Knee osteoarthritis associated with different kinds of amyloid deposits and the impact of aging on type of amyloid. Amyloid 2016; 23:26-32. [PMID: 26701417 DOI: 10.3109/13506129.2015.1115758] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Amyloidosis is a protein conformational disorder in which amyloid fibrils accumulate in the extracellular space and induce organ dysfunction. Recently, two different amyloidogenic proteins, transthyretin (TTR) and apolipoprotein A-I (Apo A-I), were identified in amyloid deposits in knee joints in patients with knee osteoarthritis (OA). However, clinicopathological differences related to those two kinds of amyloid deposits in the knee joint remain to be clarified. Here, we investigated the clinicopathological features related to these knee amyloid deposits associated with knee OA and the biochemical characteristics of the amyloid deposits. We found that all of our patients with knee OA had amyloid deposits in the knee joints, especially in the meniscus, and those deposits were primarily derived from TTR and/or Apo A-I. Some patients with knee OA, however, had unclassified amyloid deposits. One of our interesting observations concerned the different effects of aging on each type of amyloid formed. The frequency of formation of ATTR deposits clearly increased with age, but that of AApo A-I deposits decreased. Furthermore, we found that ∼16% of patients with knee OA developed ATTR/AApo A-I double deposits in the meniscus. Amyloid deposition may therefore be a common histopathological feature associated with knee OA. Also, aging may induce ATTR formation in the knee joint in elderly patients with knee OA, whereas AApo A-I formation may be inversely correlated with age.
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Affiliation(s)
- Akihiro Yanagisawa
- a Department of Orthopaedic Surgery , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan .,b Department of Neurology , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Mitsuharu Ueda
- b Department of Neurology , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Takanao Sueyoshi
- a Department of Orthopaedic Surgery , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Eiichi Nakamura
- a Department of Orthopaedic Surgery , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Masayoshi Tasaki
- b Department of Neurology , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Genki Suenaga
- b Department of Neurology , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Hiroaki Motokawa
- b Department of Neurology , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Risa Toyoshima
- b Department of Neurology , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Yumiko Kinoshita
- b Department of Neurology , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Yohei Misumi
- b Department of Neurology , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Taro Yamashita
- b Department of Neurology , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | | | - Per Westermark
- d Department of Immunology , Genetics and Pathology, Uppsala University , Uppsala , Sweden
| | - Hiroshi Mizuta
- a Department of Orthopaedic Surgery , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
| | - Yukio Ando
- b Department of Neurology , Graduate School of Medical Sciences, Kumamoto University , Chuo-ku, Kumamoto , Japan
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Amyloid deposits derived from transthyretin in the ligamentum flavum as related to lumbar spinal canal stenosis. Mod Pathol 2015; 28:201-7. [PMID: 25189643 DOI: 10.1038/modpathol.2014.102] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Revised: 05/23/2014] [Accepted: 05/28/2014] [Indexed: 11/08/2022]
Abstract
Amyloidosis is a protein conformational disorder with the distinctive feature of extracellular accumulation of amyloid fibrils that come from different proteins. In the ligamentum flavum of the lumbar spine, amyloid deposits were frequently found in elderly patients with lumbar spinal canal stenosis and were at least partially formed by wild-type transthyretin. However, how amyloid deposits in the ligamentum flavum affect lumbar spinal canal stenosis has remained unclear. In this study, we analyzed clinical, pathologic, and radiologic findings of patients with lumbar spinal canal stenosis who had amyloid deposits in the ligamentum flavum. We studied 95 ligamentum flavum specimens obtained from 56 patients with lumbar spinal canal stenosis and 21 ligamentum flavum specimens obtained from 19 patients with lumbar disk herniation. We evaluated histopathologic findings and clinicoradiologic manifestations, such as thickness of the ligamentum flavum and lumbar spinal segmental instability. We found that all 95 ligamentum flavum specimens resected from patients with lumbar spinal canal stenosis had amyloid deposits, which we classified into two types, transthyretin-positive and transthyretin-negative, and that transthyretin amyloid formation in the ligamentum flavum of patients with lumbar spinal canal stenosis was an age-associated phenomenon. The amount of amyloid in the ligamentum flavum was related to clinical manifestations of lumbar spinal canal stenosis, such as thickness of the ligamentum flavum and lumbar spinal segmental instability, in the patients with lumbar spinal canal stenosis with transthyretin-positive amyloid deposits. To our knowledge, this report is the first to show clinicopathologic correlations in transthyretin amyloid deposits of the ligamentum flavum. In conclusion, transthyretin amyloid deposits in the ligamentum flavum may be related to the pathogenesis of lumbar spinal canal stenosis in elderly patients.
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Oshima T, Kawahara S, Ueda M, Kawakami Y, Tanaka R, Okazaki T, Misumi Y, Obayashi K, Yamashita T, Ohya Y, Ihse E, Shinriki S, Tasaki M, Jono H, Asonuma K, Inomata Y, Westermark P, Ando Y. Changes in pathological and biochemical findings of systemic tissue sites in familial amyloid polyneuropathy more than 10 years after liver transplantation. J Neurol Neurosurg Psychiatry 2014; 85:740-6. [PMID: 24023270 DOI: 10.1136/jnnp-2013-305973] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVE To elucidate the long-term effects of liver transplantation (LT) on familial amyloid polyneuropathy (FAP). METHODS We investigated clinicopathological and biochemical characteristics of systemic tissues in four autopsied cases of FAP patients surviving more than 10 years after LT and seven autopsied cases without LT. For analysing the truncated form of transthyretin (TTR) in amyloid, we also employed specimens from additional 18 FAP patients. RESULTS Several tissue sites such as the heart, tongue and spinal cord had moderate-to-severe amyloid deposits but other tissues showed no or mild amyloid deposition. Those findings seemed similar to those observed in senile systemic amyloidosis (SSA), a sporadic amyloidosis caused by wild-type (WT) TTR. Also, amyloid deposits in systemic tissue sites except for the spinal cord in patients after LT derived mostly from WT TTR secreted from the normal liver grafts. In addition, in non-transplantation patients, proportions of WT TTR seemed to be relatively high in those tissue sites in which patients after LT had severe amyloid deposition, which suggests that WT TTR tends to form amyloid in those tissue sites. Finally, although the truncation of TTR in amyloid deposits did not depend on undergoing LT, we elucidated the truncation of TTR occurred predominantly in patients from non-endemic areas of Japan, where FAP amyloidogenic TTR V30M patients are late onset and low penetrance, compared with patients from an endemic area of Japan. CONCLUSIONS FAP may shift to systemic WT TTR amyloid formation after LT, which seems to be similar to the process in SSA. The truncation of TTR in amyloid deposits may depend on some genetic or environmental factors other than undergoing LT.
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Affiliation(s)
- Toshinori Oshima
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Satomi Kawahara
- Department of Diagnostic Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Mitsuharu Ueda
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Yushi Kawakami
- Department of Diagnostic Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Rina Tanaka
- Department of Diagnostic Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Takahiro Okazaki
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Yohei Misumi
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Konen Obayashi
- Department of Diagnostic Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Taro Yamashita
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Yuki Ohya
- Department of Transplantation and Pediatric Surgery, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Elisabet Ihse
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Satoru Shinriki
- Department of Diagnostic Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Masayoshi Tasaki
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Hirofumi Jono
- Department of Diagnostic Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Katsuhiro Asonuma
- Department of Transplantation and Pediatric Surgery, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Yukihiro Inomata
- Department of Transplantation and Pediatric Surgery, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Per Westermark
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Yukio Ando
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
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Guo S, Zou J, Wang G. Advances in the proteomic discovery of novel therapeutic targets in cancer. DRUG DESIGN DEVELOPMENT AND THERAPY 2013; 7:1259-71. [PMID: 24187485 PMCID: PMC3810204 DOI: 10.2147/dddt.s52216] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Proteomic approaches are continuing to make headways in cancer research by helping to elucidate complex signaling networks that underlie tumorigenesis and disease progression. This review describes recent advances made in the proteomic discovery of drug targets for therapeutic development. A variety of technical and methodological advances are overviewed with a critical assessment of challenges and potentials. A number of potential drug targets, such as baculoviral inhibitor of apoptosis protein repeat-containing protein 6, macrophage inhibitory cytokine 1, phosphoglycerate mutase 1, prohibitin 1, fascin, and pyruvate kinase isozyme 2 were identified in the proteomic analysis of drug-resistant cancer cells, drug action, and differential disease state tissues. Future directions for proteomics-based target identification and validation to be more translation efficient are also discussed.
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Affiliation(s)
- Shanchun Guo
- Department of Microbiology, Biochemistry, and Immunology, Morehouse School of Medicine, Clark Atlanta University, Atlanta, GA, USA
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Giusti L, Lucacchini A. Proteomic studies of formalin-fixed paraffin-embedded tissues. Expert Rev Proteomics 2013; 10:165-77. [PMID: 23573783 DOI: 10.1586/epr.13.3] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Formalin-fixed paraffin-embedded (FFPE) tissue specimens represent a valuable informational resource of histologically characterized specimens for proteomic studies. In this article, the authors review the advancement performed in the field of FFPE proteomics focusing on formaldehyde treatment and on strategies addressed to obtain the best recovery in the protein/peptide extraction. A variety of approaches have been used to characterize protein tissue extracts, and many efforts have been performed demonstrating the comparability between fresh/frozen and FFPE proteomes. Finally, the authors report and discuss the large numbers of works aimed at developing new strategies and sophisticated platforms in the analysis of FFPE samples to validate known potential biomarkers and to discover new ones.
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Affiliation(s)
- Laura Giusti
- Department of Pharmacy, University of Pisa, Via Bonanno 6, 56126 Pisa, Italy
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7
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Tanca A, Pagnozzi D, Addis MF. Setting proteins free: Progresses and achievements in proteomics of formalin-fixed, paraffin-embedded tissues. Proteomics Clin Appl 2011; 6:7-21. [DOI: 10.1002/prca.201100044] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2011] [Revised: 09/01/2011] [Accepted: 09/13/2011] [Indexed: 12/25/2022]
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8
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Sen S, Sarsik B. A proposed histopathologic classification, scoring, and grading system for renal amyloidosis: standardization of renal amyloid biopsy report. Arch Pathol Lab Med 2010; 134:532-44. [PMID: 20367305 DOI: 10.5858/134.4.532] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
CONTEXT A disease associated with amyloid deposits, called amyloidosis, is associated with characteristic electron microscopic appearance, typical x-ray pattern, and specific staining. Renal involvement mainly occurs in AA amyloidosis and AL amyloidosis and usually progresses to renal failure. OBJECTIVE The renal histopathologic changes with amyloidosis comprise a spectrum. Clear relationships between the extent of amyloid deposition and the severity of clinical manifestations have not been demonstrated. Whether there is a lack of clinicopathologic correlation is not clear, but studies have revealed the need for standardization of the renal amyloid biopsy report. With these objectives in mind, we proposed a histopathologic classification, scoring, and grading system. Renal amyloidosis was divided into 6 classes, similar to the classification of systemic lupus erythematosus. Amyloid depositions and other histopathologic lesions were scored. The sum of these scores was termed the renal amyloid prognostic score and was divided into 3 grades. DATA SOURCES AA amyloidosis was detected in 90% of cases, mostly related to familial Mediterranean fever. Positive correlations between class I and grade I, class VI and grade III, and class III and grade II were observed. Also, a positive correlation was identified between severity of glomerular amyloid depositions, interstitial fibrosis, and inflammation. Because of the inadequacy of the patients' records and outcomes, different therapy regimes, and etiologies, clinical validation of this study has not been completed. CONCLUSIONS Standardization of the renal amyloid pathology report might be critical for patients' medication and comparison of outcome and therapeutic trials between different clinics. Because of our AA to AL amyloidosis ratio and the predisposition of familial Mediterranean fever-related AA amyloidosis, there is a need for further international collaborative studies.
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Affiliation(s)
- Sait Sen
- Pathology Department, Ege University School of Medicine, Bornova Izmir, Turkey.
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Murphy CL, Wang S, Williams T, Weiss DT, Solomon A. Characterization of Systemic Amyloid Deposits by Mass Spectrometry. Methods Enzymol 2006; 412:48-62. [PMID: 17046651 DOI: 10.1016/s0076-6879(06)12004-2] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The human systemic (noncerebral) amyloidoses represent a heterogeneous group of disorders characterized by the widespread deposition of proteins as fibrils in organs or tissues throughout the body. The unequivocal identification of the type of amyloid deposited is critical to the correct diagnosis and treatment of patients with these illnesses. Heretofore, this information was inferred from clinical data, ancillary laboratory tests, and results of immunohistochemical, as well as genetic, analyses. However, to establish definitively the type of amyloid present, the chemical composition of the fibrillar components must be determined. For this purpose, we have developed micro-methods, whereby this information can be obtained by tandem mass spectrometry (MS/MS) using material extracted from formalin-fixed, amyloid-containing tissue biopsy specimens or subcutaneous fat aspirates. The ability to identify precisely the protein nature of the pathologic deposits has diagnostic, therapeutic, and prognostic implications for patients with amyloid-associated disease.
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Affiliation(s)
- Charles L Murphy
- Human Immunology and Cancer Program, University of Tennessee Graduate School of Medicine, Knoxville, 37920, USA
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10
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Kaplan B, Martin BM, Livoff A, Yeremenko D, Livneh A, Cohen HI. Gastrointestinal beta2microglobulin amyloidosis in hemodialysis patients: biochemical analysis of amyloid proteins in small formalin-fixed paraffin-embedded tissue specimens. Mod Pathol 2005; 18:1610-7. [PMID: 16258516 DOI: 10.1038/modpathol.3800477] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We present here a first report on the biochemical analysis of intestinal amyloid deposits found in two cases of hemodialysis-related amyloidosis. A new microtechnique was applied for extraction and immunochemical/chemical characterization of amyloid proteins in small amounts of fixed tissue, thus allowing precise identification of beta2microglobulin amyloid (Abeta2M) in both cases studied. The molecular mass of the identified amyloid beta2M was close to that of intact beta2M (12 kDa), with no evidence of the products of proteolytic fragmentation of these molecules. The isoelectrofocusing of the purified Abeta2M demonstrated a shift to more acidic pI as compared to the normal beta2M analyzed under the same experimental conditions. The obtained data suggest that the intestinal amyloid deposits in dialysis-related amyloidosis contain disease-specific beta2M isoforms, which could play a role in the pathogenesis of amyloid disease. The new methodology used might be useful in obtaining precise diagnosis of amyloidosis that is necessary for appropriate therapy, and also provide new important information on the chemical structure of amyloid proteins.
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Affiliation(s)
- Batia Kaplan
- Heller Institute of Medical Research, Sheba Medical Center, Tel-Hashomer, Israel.
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Yazaki M, Liepnieks JJ, Callaghan J, Connolly CE, Benson MD. Chemical characterization of a lambda I amyloid protein isolated from formalin-fixed and paraffin-embedded tissue sections. Amyloid 2004; 11:50-5. [PMID: 15185499 DOI: 10.1080/13506120410001689382] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Amyloid protein was isolated from formalin-fixed paraffin-embedded heart tissue sections from a patient with primary (AL) amyloidosis by extraction with 6 M guanidine HCl. SDS-PAGE analysis of extracted material showed a major band at 16 kDa and a minor band at 18 kDa. Edman degradation analysis before and after pyroglutamate aminopeptidase treatment showed that the amyloid protein contained N-terminal pyroglutamic acid and was derived from an immunoglobulin lambda light chain. Analysis of tryptic peptides from the extract identified the amyloid protein as a lambda I. Of particular interest is that almost the entire amyloid protein amino acid sequence could be obtained from the cardiac sections. These results demonstrate that formalin-fixed paraffin-embedded tissue sections can be used for extensive biochemical characterization of amyloid proteins and will become a valuable source for isolation and extensive biochemical characterization of amyloid proteins as they are now a valuable source for isolation of DNA for genetic analysis.
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Affiliation(s)
- Masahide Yazaki
- Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, 635 Barnhill Drive, MS-128, Indianapolis, IN 46202-5126, USA
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Abstract
This review describes the different microtechniques developed for the extraction and purification of amyloid proteins from small specimens of fresh and formalin fixed tissues. These procedures differ with respect to solvent type, extraction conditions, and protein purification strategy. The advantages and disadvantages of the different microtechniques are discussed by taking into consideration tissue type (fresh of fixed) and size, amyloid type, and its content in the tissue. The review demonstrates the applicability of these techniques for the immunochemical and chemical characterisation of amyloid in different clinical forms of amyloidosis and in experimental small animal models. The clinical value of the applied microtechniques and their importance in the study of the pathogenesis of amyloid related diseases are outlined.
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Affiliation(s)
- B Kaplan
- Heller Institute of Medical Research, Sheba Medical Centre, Tel Hashomer 52621, Israel.
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13
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Murphy CL, Eulitz M, Hrncic R, Sletten K, Westermark P, Williams T, Macy SD, Wooliver C, Wall J, Weiss DT, Solomon A. Chemical typing of amyloid protein contained in formalin-fixed paraffin-embedded biopsy specimens. Am J Clin Pathol 2001; 116:135-42. [PMID: 11447744 DOI: 10.1309/twbm-8l4e-vk22-frh5] [Citation(s) in RCA: 118] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
The human amyloidoses represent a heterogeneous group of disorders characterized by the deposition of fibrillar protein in vital organs. Given the fact that at least 20 different molecules can form fibrils, the unambiguous identification of the type of amyloid deposited is critical to the correct diagnosis and treatment of patients with these disorders. Heretofore, this information has been inferred from particular clinical features of the disease, ancillary laboratory tests, and results of immunohistochemical analyses. However, to establish unequivocally the kind of protein that is deposited as amyloid, it is necessary to determine its chemical composition through amino acid sequencing or mass spectroscopy of material extracted from fibrillar deposits. We have developed a micromethod whereby such studies can be performed readily using sections of formalin-fixed, paraffin-embedded biopsy specimens. The ability to identify precisely the nature of the tissue deposits has diagnostic, therapeutic, and prognostic implications for patients with amyloid-associated disorders.
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Affiliation(s)
- C L Murphy
- University of Tennessee Graduate School of Medicine, Knoxville, TN, USA
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14
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Kaplan B, Hrncic R, Murphy CL, Gallo G, Weiss DT, Solomon A. Microextraction and purification techniques applicable to chemical characterization of amyloid proteins in minute amounts of tissue. Methods Enzymol 1999; 309:67-81. [PMID: 10507017 DOI: 10.1016/s0076-6879(99)09007-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This article described micromethods useful for the extraction, purification, and amino acid sequencing of amyloid proteins contained in minute specimens obtained from patients with systemic forms of amyloidosis. We posit that these procedures can also be applied to the biochemical characterization of cerebral amyloid deposits. The selection of the techniques is dependent on the type of sample to be extracted (fresh or formalin fixed) as well as the amount of congophilic material present. Although amyloid proteins are isolated and purified more easily from fresh tissue, it must be noted that formalin-fixed specimens are available more readily for analysis due to the common diagnostic use of fine needle tissue biopsies and are therefore, important for both current and retrospective studies. Remarkably, despite the expected difficulties associated with formalin treatment we were able to extract and sequence amyloid proteins from fixed tissues presumably due to the resistance of amyloid to formalin cross-linking. Through the continued development of techniques for small-scale protein separation and application of highly sensitive microsequencing and mass spectral methods, exact identification of the protein contained in fibrillar amyloid deposits can be determined. Such information has therapeutic and prognostic relevance and can increase our understanding of the pathogenesis of amyloidosis.
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Affiliation(s)
- B Kaplan
- Heller Institute of Medical Research, Chaim Sheba Medical Center, Tel Hashomer, Israel
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