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  • 1. Bergstrom, J
    et al.
    Murphy, C
    Eulitz, M
    Weiss, DT
    Westermark, Gunilla
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Clinical and Experimental Medicine, Cell Biology.
    Solomon, A
    Westermark, P
    An additional apolipoprotein in ATTR-amyloid2001In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 8, p. 32-33Conference paper (Other academic)
  • 2.
    Hahn, Katharina
    et al.
    Christian Albrechts University of Kiel, Germany.
    Nilsson, Peter
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Hammarström, Per
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Urban, Peter
    Institute Pathol and Dermatopathol, Germany.
    Ruediger Meliss, Rolf
    Institute Dermatopathol, Germany.
    Behrens, Hans-Michael
    Christian Albrechts University of Kiel, Germany.
    Krueger, Sandra
    Christian Albrechts University of Kiel, Germany.
    Roecken, Christoph
    Christian Albrechts University of Kiel, Germany.
    Establishing and validating the fluorescent amyloid ligand h-FTAA (heptamer formyl thiophene acetic acid) to identify transthyretin amyloid deposits in carpal tunnel syndrome2017In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 24, no 2, p. 78-86Article in journal (Refereed)
    Abstract [en]

    Transthyretin-derived (ATTR) amyloidosis is a frequent finding in carpal tunnel syndrome. We tested the following hypotheses: the novel fluorescent amyloid ligand heptameric formic thiophene acetic acid (h-FTAA) has a superior sensitivity for the detection of amyloid compared with Congo red-staining; Amyloid load correlates with patient gender and/or patient age. We retrieved 208 resection specimens obtained from 184 patients with ATTR amyloid in the carpal tunnel. Serial sections were stained with Congo red, h-FTAA and an antibody directed against transthyretin (TTR). Stained sections were digitalized and forwarded to computational analyses. The amount of amyloid was correlated with patient demographics. Amyloid stained intensely with h-FTAA and an anti-TTR-antibody. Congo red-staining combined with fluorescence microscopy was significantly less sensitive than h-FTAA-fluorescence and TTR-immunostaining: the highest percentage area was found in TTR-immunostained sections, followed by h-FTAA and Congo red. The Pearson correlation coefficient was .8 (Congo red vs. h-FTAA) and .9 (TTR vs. h-FTAA). Amyloid load correlated with patient gender, anatomical site and patient age. h-FTAA is a highly sensitive method to detect even small amounts of ATTR amyloid in the carpal tunnel. The staining protocol is easy and h-FTAA may be a much more sensitive procedure to detect amyloid at an earlier stage.

  • 3.
    Hornemann, S
    et al.
    Institute of Neuropathology, University Hospital Zurich, Zu¨ rich, Switzerland.
    Sponarova, J
    Institute of Neuropathology, University Hospital Zurich, Zu¨ rich, Switzerland.
    Zhu, C
    Institute of Neuropathology, University Hospital Zurich, Zu¨ rich, Switzerland.
    Finder, V
    Institute of Molecular Biology and Biophysics, Swiss Federal Institute of Technology, Zürich, Switzerland.
    Glockshuber, R
    Institute of Molecular Biology and Biophysics, Swiss Federal Institute of Technology, Zürich, Switzerland.
    Nilsson, Peter
    Linköping University, Department of Physics, Chemistry and Biology, Organic Chemistry. Linköping University, The Institute of Technology.
    Aguzzi, A
    Institute of Neuropathology, University Hospital Zurich, Zürich, Switzerland.
    Mechanistic and structural aspects of the interaction of luminescent conjugated polymers with amyloid oligomers2010In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 17, no S1, p. 98-99Article in journal (Other academic)
    Abstract [en]

    Protein  misfolding  and aggregation  diseases, such as e.g. Alzheimer’s disease, are associated by the accumulation of a disease-related protein.  The pathogenic  mechanisms involved in these confor- mational diseases are only poorly understood. Luminescent-conjugated   polymers    (LCPs)     have been   shown   as  a  sensitive   tool   for  detection   of amyloid deposits. In contrast to commonly used amyloidotropic  dyes  such  as  thioflavins  or  Congo Red, LCPs are composed of flexible polythiophene chains which allow rotation  of the molecule.  Upon binding to amyloids, the LCPs alter their spectral properties  in a conformation dependent manner. However,  there  is still limited  information available on the binding  mechanism and binding  properties  of the LCPs  to amyloid fibrils and oligomers.

    We  have  produced  recombinant  human   Aβ1-42 (recAβ1-42) protein  in Escherichia coli and  purified it by conventional chromatographic techniques in large  quantities. The  recAβ-protein was  incubated in the presence  of SDS to induce formation  of homogenous, globular Aβ-oligomers  with a size of approximately   60  kDa,  known  as  Aβ-globulomers. We present  first biophysical  and  spectroscopic data used  to study  the  binding  and  structural properties of  the  complex   formed   by  the  globulomers   and LCPs  with various  charged  side chains.  These  data will  provide   a  more   detailed   knowledge   of  the binding    mode    of   amyloidogenic    probes    which is essential for understanding the structural char- acteristics    of   amyloid   fibrils   detected    by   thesemolecules.

  • 4.
    Jonson, Maria
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Divison of Neurobiology. Linköping University, Faculty of Medicine and Health Sciences.
    Nyström, Sofie
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Sandberg, Alexander
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Carlback, Marcus
    Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Medicine and Health Sciences.
    Michno, Wojciech
    Univ Gothenburg, Sweden.
    Hanrieder, Jorg
    Univ Gothenburg, Sweden; UCL, England.
    Starkenberg, Annika
    Linköping University, Department of Clinical and Experimental Medicine, Division of Surgery, Orthopedics and Oncology. Linköping University, Faculty of Medicine and Health Sciences.
    Peter, K.
    Nilsson, Peter
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Thor, Stefan
    Linköping University, Department of Clinical and Experimental Medicine, Division of Hematopoiesis and Developmental Biology. Linköping University, Faculty of Medicine and Health Sciences.
    Hammarström, Per
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Amyloid fibril polymorphism and cell-specific toxicity in vivo2019In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 26, no sup1, p. 136-137Article in journal (Refereed)
    Abstract [en]

    n/a

  • 5.
    Ma, Zhi
    et al.
    Linköping University, Department of Molecular and Clinical Medicine, Molecular and Immunological Pathology. Linköping University, Faculty of Health Sciences.
    Westermark, Gunilla
    Linköping University, Department of Biomedicine and Surgery, Cell biology. Linköping University, Faculty of Health Sciences.
    Sakagashira, S.
    First Department of Medicine, Wakayama University of Medical Science, Kagawa Medical University, Japan.
    Sanke, T.
    First Department of Medicine, Wakayama University of Medical Science, Kagawa Medical University, Japan.
    Gustavsson, Å
    Linköping University, Department of Molecular and Clinical Medicine, Molecular and Immunological Pathology. Linköping University, Faculty of Health Sciences.
    Sakamoto, H.
    Department of Pathology, Kagawa Medical University, Japan.
    Engstrom, U.
    Ludwig Institute of Cancer Research, Uppsala Branch, Uppsala University, Uppsala, Sweden.
    Nanjo, K.
    First Department of Medicine, Wakayama University of Medical Science, Kagawa Medical University, Japan.
    Westermark, P.
    Department of Genetics and Pathology, Uppsala University, Uppsala, Sweden.
    Enhanced in vitro production of amyloid-like fibrils from mutant (S20G) islet amyloid polypeptide2001In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 8, no 4, p. 242-249Article in journal (Refereed)
    Abstract [en]

    Islet amyloid polypeptide (IAPP, “amylin”) is the amyloid-fibril-forming polypeptide in the islets of Langerhans associated with type 2 diabetes mellitus. A missense mutation in the IAPP gene associated with early-onset type 2 diabetes has been identified in the Japanese population. This mutation results in a glycine for serine substitution at position 20 of the mature IAPP molecule. Whether or not formation of islet amyloid with resulting destruction of islet tissue is the cause of this diabetes is yet not known. The present in vitro study was performed in order to investigate any influence of the amino acid substitution on the fibril formation capacity. Synthetic full-length wild type (lAPPwt) and mutant (IAPPS20G) as well as corresponding truncated peptides (position 18-29) were dissolved in dimethylsulfoxide (DMSO) or in 10% acetic acid at a concentration of 10 mg/mL and their fibril forming capacity was checked by Congo red staining, electron microscopy, a Congo red affinity assay and Thioflavine T fluorometric assay. It was found that full-length and truncated IAPPS20G both formed more amyloid-like fibrils and did this faster compared to IAPPwt. The fibril morphology differed slightly between the preparations. Conclusion: The amino acid substitution (S20G) is situated close to the region of the IAPP molecule implicated in the IAPP fibrillogenesis. The significantly increased formation of amyloid-like fibrils by IAPPS20G is highly interesting and may be associated with an increased islet amyloid formation in vivo and of fundamental importance in the pathogenesis of this specific form of diabetes.

  • 6.
    Ma, Zhi
    et al.
    Linköping University, Department of Molecular and Clinical Medicine, Molecular and Immunological Pathology. Linköping University, Faculty of Health Sciences.
    Westermark, Gunilla T.
    Linköping University, Department of Molecular and Clinical Medicine, Molecular and Immunological Pathology. Linköping University, Faculty of Health Sciences.
    Johnsson, Kenneth H.
    Department of Veterinary Patho Biology, College of Veterinary Medicine, University of Minnesota, St Paul, Minnesota, 55108, USA.
    O'Brien, Timothy D.
    Department of Veterinary Diagnostic Medicine, College of Veterinary Medicine, University of Minnesota, St Paul, Minnesota, 55108, USA .
    Westermark, Per
    Linköping University, Department of Molecular and Clinical Medicine, Molecular and Immunological Pathology. Linköping University, Faculty of Health Sciences.
    Quantitative immunohistochemical analysis of islet amyloid polypeptide (IAPP) in normal, impaired glucose tolerant, and diabetic cats1998In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 5, no 4, p. 255-261Article in journal (Refereed)
    Abstract [en]

    Islet amyloid polypeptide (IAPP, “amylin”) has been proposed as having important roles in the pathogenesis of type 2 diabetes mellitus via its biological activity and by forming islet amyloid. The domestic cat develops a type of diabetes that closely resembles type 2 diabetes in humans, including the frequent formation of islet amyloid deposits in the impaired glucose tolerant (IGT) and diabetic state. With the aid of computerized image analysis and immuno-histochemistry, we examined the IAPP and insulin content inpancreatic islets of normal, IGT and diabetic cats. IAPP immunoreactivity in beta cells from IGT cats was significantly stronger (p < 0.01) as compared with cells from normal cats, while the insulin labelling strength was unchanged. Overtly diabetic cats were usually almost devoid of beta cells. As in humans, cellular IAPP but not IAPP in islet amyloid deposits was labelled by the newly developed monoclonal antibody to IAPP 4A5, thus providing further evidence that IAPP is modified by a yet unknown mechanism during the amyloidogenic process. The study provides evidence that an increased beta cell storage of IAPP independent of insulin may be an important factor in the early phase of the development of islet amyloid in this form of diabetes.

  • 7.
    Nyström, Sofia N.
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Cell Biology. Linköping University, Faculty of Health Sciences.
    Westermark, Gunilla T.
    Uppsala University, Sweden.
    AA-Amyloid is cleared by endogenous immunological mechanisms2012In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 19, no 3, p. 138-145Article in journal (Refereed)
    Abstract [en]

    Reactive amyloidosis is a complication to longstanding inflammatory diseases.Protein amyloid A (AA), an N-terminal fragment of the acute phase protein serumamyloid A, undergoes conformational changes and is deposited as amyloid in tissue.AA-amyloidosis is reversible and reduction of amyloid mass has been reported as theinflammation ceases. Not much is known about the endogenous factors thatcontribute to amyloid resolution. Herein, we describe the dynamics of amyloiddegradation in experimental murine AA-amyloidosis and show that amyloiddegradation depends on macrophages and antibody formation. AA-amyloidosis wasinduced in mice and resolution of amyloid was monitored over time by histologicaltechniques. Internalized amyloid was present in macrophages that appeared at siteof deposition. At 9 months, when virtually all amyloid was cleared, amyloidosis wasre-induced in one group of animals by a single silver nitrate injection. This causedeposition of excessive amounts of amyloid, and indicate that even thoughundetectable the amyloid reseed in the body and can there act as amyloid enhancingfactor. Antibodies directed against protein AA were detected in animals duringamyloid clearance by ELISA-technique. Passive immunization with an amyloidspecific monoclonal antibody, produced by a B-cell clone recovered from an animalwith advanced AA-amyloidosis, diminish amyloid deposits in murine AA-amyloidosis.Immunoglobulins co-localize with amyloid deposits and can contribute to amyloiddegradation by Fc-receptor mediated phagocytosis.

  • 8.
    Nyström, Sofie
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Vahdat Shariat Panahi, Aida
    Linköping University, Department of Clinical and Experimental Medicine, Divison of Neurobiology. Linköping University, Faculty of Medicine and Health Sciences.
    Nilsson, Peter
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Westermark, Per
    d Department of Immunology , Genetics and Pathology, Uppsala University , Uppsala , Sweden.
    Westermark, Gunilla T.
    e Department of Medical Cell Biology , Uppsala University , Uppsala , Sweden.
    Hammarström, Per
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Lundmark, Katarzyna
    Linköping University, Department of Clinical and Experimental Medicine, Divison of Neurobiology. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Center for Diagnostics, Clinical pathology.
    Seed-dependent templating of murine AA amyloidosis2017In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 24, no sup1, p. 140-141Article in journal (Other academic)
    Abstract [en]

    n/a

  • 9.
    Olsen, KE
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Molecular and Immunological Pathology. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
    Sletten, K
    Sandgren, O
    Olsson, H
    Myrvold, K
    Westermark, P
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Molecular and Immunological Pathology. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
    What is the role of giant cells in AL-amyloidosis?1999In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 6, p. 89-97Article in journal (Refereed)
  • 10.
    Paulsson, Johan
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Clinical and Experimental Medicine, Cell Biology.
    Westermark, Gunilla
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Clinical and Experimental Medicine, Cell Biology.
    Differences in distribution of insulin and IAPP on the cellular level2001In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 8, p. 132-132Conference paper (Other academic)
  • 11. Peng, SW
    et al.
    Westermark, Gunilla
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Clinical and Experimental Medicine, Cell Biology.
    Sletten, K
    Glennert, J
    Westermark, P
    Distribution of medin-amyloid in aging and in association with arterial diseases2001In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 8, p. 122-123Conference paper (Other academic)
  • 12. Samdahl, IA
    et al.
    Sletten, K
    Olsen, KE
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Molecular and Immunological Pathology. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
    Westermark, P
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Molecular and Immunological Pathology. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
    AL 366 - a glycosylated protein of kappa 1b origin in a patient with systemic amyloidosis of predominantly non-parenchymatous distribution.2001In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 8, p. 111-114Article in journal (Refereed)
  • 13.
    Schultz, Sebastian
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Cell Biology. Linköping University, Faculty of Health Sciences.
    Nilsson, Peter
    Linköping University, Department of Physics, Chemistry and Biology, Organic Chemistry. Linköping University, The Institute of Technology.
    Thor, Stefan
    Linköping University, Department of Clinical and Experimental Medicine, Developmental Biology. Linköping University, Faculty of Health Sciences.
    Westermark, Gunilla
    Linköping University, Department of Clinical and Experimental Medicine, Cell Biology. Linköping University, Faculty of Health Sciences.
    Fly model of type 2 diabetes: processing of proIAPP makes a difference2010In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 17, no S1, p. 44-45Article in journal (Other academic)
    Abstract [en]

    Patients  with type 2 diabetes  have a marked  reducedbeta cell mass and fail to produce  sufficient amounts of insulin required  for regulation  of glucose home- ostasis. Recent research supports that intracellular aggregation of islet amyloid polypeptide  (IAPP) leads to cell death and therefore makes IAPP aggregation a plausible cause for the beta cell reduction. Little is known about the mechanisms that precede amyloid formation  or which cellular pathways are involved in this process.  To  gain better  understanding we haveestablished  a Drosophila melanogaster model,  where GAL4 drives expression  of UAS-targeted transgenes in a cell or tissue specific pattern. The  fruit fly offers a unique  option  to manipulate any cellular  pathway with  different   genetic   tools.   The   knowledge   that*70%  of all Drosophila  melanogaster genes  have anorthologue in humans  stress  the  potential  for path- ways found in D. melanogaster to be of importance in humans  as well. Transgenic flies expressing  human proIAPP  (the precursor of IAPP)  and IAPP and the non-amyloidogenic mouse IAPP (mIAPP) have been generated.  Expression    of  proIAPP    in   the   brain reduced the lifespan of the fly whereas neither  IAPP nor mIAPP expression influenced survival. Immu- nolabelling  with  an  antibody  raised  against  human IAPP   and   that   cross-reacts    with   murine    IAPP labelled neurons  in all three strains, whereas a concomitant loss of cell nuclei only appeared  during proIAPP and IAPP expression. Furthermore, we detected  an early potentiated activation of the autophagy  pathway  in  proIAPP   flies. Interestingly, even  though  IAPP  expression  was not  related  to  a shorter  lifespan, both IAPP and proIAPP  expression in the  central  nervous  system  led  to  amyloid deposition  in the fat body of the head as shown with Congo  red  and  pFTAA,   a  newly  synthesised luminescent conjugated polymer. Our results de- monstrate that  D. melanogaster has a great  potential as a model  for studies  of proIAPP  and  IAPP expression with subsequent amyloid formation  and connected cellular  response  mechanisms. The  find- ing that proIAPP  aggregation  seems to exert a more toxic  impact  at  a  cellular  level is in  line  with  ourresults from mammalian cell lines.

  • 14.
    Shariatpanahi, Aida
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Divison of Neurobiology. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Center for Diagnostics, Clinical pathology.
    Hultman, Per
    Linköping University, Department of Clinical and Experimental Medicine, Division of Neuro and Inflammation Science. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Center for Diagnostics, Clinical pathology.
    Öllinger, Karin
    Linköping University, Department of Clinical and Experimental Medicine, Division of Cell Biology. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Center for Diagnostics, Clinical pathology.
    Westermark, Gunilla T.
    Uppsala Univ, Sweden.
    Lundmark, Katarzyna
    Linköping University, Department of Clinical and Experimental Medicine, Divison of Neurobiology. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Center for Diagnostics, Clinical pathology.
    Lipid membranes accelerate amyloid formation in the mouse model of AA amyloidosis2019In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 26, no 1, p. 34-44Article in journal (Refereed)
    Abstract [en]

    Introduction: AA amyloidosis develops as a result of prolonged inflammation and is characterized by deposits of N-terminal proteolytic fragments of the acute phase reactant serum amyloid A (SAA). Macrophages are usually found adjacent to amyloid, suggesting their involvement in the formation and/or degradation of the amyloid fibrils. Furthermore, accumulating evidence suggests that lipid membranes accelerate the fibrillation of different amyloid proteins.

    Methods: Using an experimental mouse model of AA amyloidosis, we compared the amyloidogenic effect of liposomes and/or amyloid-enhancing factor (AEF). Inflammation was induced by subcutaneous injection of silver nitrate followed by intravenous injection of liposomes and/or AEF to accelerate amyloid formation.

    Results: We showed that liposomes accelerate amyloid formation in inflamed mice, but the amyloidogenic effect of liposomes was weaker compared with AEF. Regardless of the induction method, amyloid deposits were mainly found in the marginal zones of the spleen and coincided with the depletion of marginal zone macrophages, while red pulp macrophages and metallophilic marginal zone macrophages proved insensitive to amyloid deposition.

    Conclusions: We conclude that increased intracellular lipid content facilitates AA amyloid fibril formation and show that the mouse model of AA amyloidosis is a suitable system for further mechanistic studies.

  • 15.
    Sjölander, Daniel
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, The Institute of Technology.
    Bijzet, Johan
    Department of Rheumatology & Clinical Immunology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
    Hazenberg, Bouke P.
    Department of Rheumatology & Clinical Immunology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
    Nilsson, Peter
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, The Institute of Technology.
    Hammarström, Per
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, The Institute of Technology.
    Sensitive and rapid assessment of amyloid by oligothiophene fluorescence in subcutaneous fat tissue2015In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 22, no 1, p. 19-25Article in journal (Refereed)
    Abstract [en]

    Systemic amyloidosis (SA) is often diagnosed late. Combining clinical and biochemical biomarkers is necessary for raising suspicion of disease. Fine needle aspiration (FNA) of subcutaneous fat enables SA detection by Congo red staining. The luminescent conjugated probe heptameric formic thiophene acetic acid (h-FTAA) is a sensitive alternative to Congo red-staining of tissue samples. Our objective was to compare h-FTAA fluorescence with the Congo red stain for amyloid detection in FNA-obtained fat tissue. Herein, we studied samples from 57 patients with established SA (19 with AA, 20 with AL, and 18 with ATTR) and 17 age-matched controls (34–75 years). Positivity for h-FTAA was graded according to a Congo red-based grading scale ranging from 0 to 4+. Amyloid grading by both methods correlated strongly (r = 0.87). Here h-FTAA was positive in 53 of 54 Congo red-positive cases (sensitivity 98%) and h-FTAA was negative in 7 of 17 Congo red-negative controls (specificity 41%), but was also positive for 3 Congo red-negative SA cases. We conclude that h-FTAA fluorescence is more sensitive than Congo red staining in this small exploratory study of fat tissue samples, implicating potential sensitivity for prodromal amyloidosis, but is less specific for clinical amyloidosis defined by Congo red positivity. Given its simplicity h-FTAA staining may therefore be the most appropriate method for rapid screening of fat tissue samples but should presently treat grade 1+ as only suggestive, whereas 2+ or higher as positive for amyloidosis. Parallel assessment of h-FTAA and Congo red staining appears highly promising for clinical applications.

  • 16.
    Sjölander, Daniel
    et al.
    Linköping University, Faculty of Science & Engineering. Linköping University, Department of Physics, Chemistry and Biology, Chemistry.
    Roecken, Christoph
    University of Kiel, Germany.
    Westermark, Per
    Uppsala University, Sweden.
    Westermark, Gunilla T.
    Uppsala University, Sweden.
    Nilsson, Peter
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Hammarström, Per
    Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, Faculty of Science & Engineering.
    Establishing the fluorescent amyloid ligand h-FTAA for studying human tissues with systemic and localized amyloid2016In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 23, no 2, p. 98-108Article in journal (Refereed)
    Abstract [en]

    Rapid and accurate detection of amyloid deposits in routine surgical pathology settings are of great importance. The use of fluorescence microscopy in combination with appropriate amyloid specific dyes is very promising in this regard. Here we report that a luminescent conjugated oligothiophene, h-FTAA, rapidly and with high sensitivity and selectivity detects amyloid deposits in verified clinical samples from systemic amyloidosis patients with AA, AL and ATTR types; as well as in tissues laden with localized amyloidosis of AANF, AIAPP and ASem1 type. The probe h-FTAA emitted yellow red fluorescence on binding to amyloid deposits, whereas no apparent staining was observed in surrounding tissue. The only functional structure stained with h-FTAA showing the amyloidotypic fluorescence spectrum was Paneth cell granules in intestine. Screening of 114 amyloid containing tissues derived from 107 verified (Congo red birefringence and/or immunohistochemistry) amyloidosis patients revealed complete correlation between h-FTAA and Congo red fluorescence (107/107, 100% sensitivity). The majority of Congo red negative control cases (27 of 32, 85% specificity) were negative with h-FTAA. Small Congo red negative aggregates in kidney, liver, pancreas and duodenum were found by h-FTAA fluorescence in five control patients aged 72-83 years suffering from diverse diseases. The clinical significance of these false-positive lesions is currently not known. Because h-FTAA fluorescence is one magnitude brighter than Congo red and as the staining is performed four magnitudes lower than the concentration of dye, we believe that these inclusions are beyond detection by Congo red. We conclude that h-FTAA is a fluorescent hypersensitive, rapid and powerful tool for identifying amyloid deposits in tissue sections. Use of h-FTAA can be exploited as a rapid complementary technique for accurate detection of amyloid in routine surgical pathology settings. Our results also implicate the potential of the technique for detection of prodromal amyloidosis as well as for discovery of new amyloid-like protein aggregates in humans.

  • 17. Sörby, Randi
    et al.
    Espenes, Arild
    Landsverk, Thor
    Westermark, Gunilla
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Clinical and Experimental Medicine, Cell Biology.
    Rapid induction of experimental AA amyloidosis in mink by intravenous injection of amyloid enhancing factor2008In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 15, no 1, p. 20-28Article in journal (Refereed)
    Abstract [en]

    Studies of amyloid enhancing factor (AEF)-induced amyloidosis are commonly performed in mice. In mink, earlier studies of amyloid A (AA) amyloidosis showed that the predeposition phase was highly variable. Thus, the aim of the study was to establish an AEF-induced AA amyloidosis model in mink to facilitate studies of early amyloid deposition in a species with prominent ellipsoids, anatomical structures lacking in mice but present in most other mammals. AEF was extracted from mink spleens containing AA. Mink received one intravenous injection of AEF and repeated subcutaneous injections of lipopolysaccharide (LPS) as an inflammatory stimulus. On day 4, small amounts of amyloid were detected in the marginal zone in the spleen. On day 7, considerable amyloid deposition was detected in the ellipsoids and marginal zones in the spleen and in the space of Disse in the liver. By immunohistochemistry, the deposits were identified as AA amyloid. Immunolabeling was also detected in lymphoid follicles and the red pulp of some animals. Control animals receiving only AEF were negative. Control animals receiving only LPS were negative except for one of three animals which had small amounts of amyloid in the spleen. The mink AEF model is a suitable tool to study the development of AA amyloidosis in a species with a spleen containing both well-developed ellipsoids and marginal zone. © 2008 Informa UK Ltd.

  • 18.
    Westermark, Gunilla
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Clinical and Experimental Medicine, Cell Biology.
    Ma, Z
    Effects of free fatty acids (FFAs) on polymerization of islet amyloid polypeptide (IAPP)2001In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 8, p. 128-128Conference paper (Other academic)
  • 19.
    Westermark, Gunilla
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Biomedicine and Surgery, Cell biology.
    Westermark, Per
    Endocrine amyloid - A subject of increasing interest for the next century2000In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 7, no 1, p. 19-22Article in journal (Refereed)
  • 20.
    Westermark, P
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Molecular and Immunological Pathology. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
    Araki, S
    Benson, MD
    Cohen, A
    Frangione, B
    Masters, CL
    Saraiva, MJ
    Sipe, JD
    Husby, G
    Kyle, RA
    Selkoe, D
    Nomenclature of amyloid fibril proteins. Report from the meeting of the international nomenclature committee on amyloidosis, August 8-9, 1998. Part 1.1999In: Amyloid: Journal of Protein Folding Disorders, ISSN 1350-6129, E-ISSN 1744-2818, Vol. 6, p. 63-66Article in journal (Refereed)
1 - 20 of 20
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