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- •Contents
- •Preface
- •Amyloid Cardiomyopathy
- •Abstract
- •Definition, Pathophysiology and Classification
- •Clinical Manifestation and Diagnostics
- •Scintigraphy
- •Magnetic Resonance
- •AL Amyloidosis Therapy
- •Cardiac Biomarkers
- •Electrocardiography
- •Echocardiography
- •TTR Amyloidosis Therapy
- •Conservative Symptomatic and
- •Supportive Treatment
- •Conclusion
- •References
- •Abstract
- •Introduction
- •An Unmet Need
- •General Biology of Amyloidosis
- •Targeting the Deposits and Fibrils
- •with Immunotherapy
- •Conclusion
- •References
- •Abstract
- •Introduction
- •Clinical Aspects
- •Detection and Diagnosis
- •Genetic Counseling for Hereditary Amyloidosis
- •Treatment and Management
- •Conclusion
- •References
- •Tissue Examination in a
- •Diagnostic Procedure
- •Abstract
- •Introduction
- •Histopathology in Basic and Special Stains
- •Basic Composition of an Amyloid Deposit
- •Immunohistochemical Examination
- •Fluorescent Examination
- •Electron Microscopy, X-Ray Fibre Diffraction
- •Mass Spectrometry-Based Methods
- •Conclusion
- •Acknowledgment
- •References
- •Abstract
- •Introduction
- •Heavy/Light Chains Pairs (HLC)
- •Cardiac Enzymes: Troponin T (TnT), Troponin I (TnI)
- •Proteinuria
- •Alkaline Phosphatase (ALP)
- •Results and Discussion
- •FLC and MIg Determination
- •Heavy/Light Chains Pairs (HLC)
- •Troponins and NT-ProBNP
- •Conclusion
- •References
- •Bibliography
- •Related Nova Publications
- •Index

Clinical Management of Amyloidosis
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In: Amyloidosis ISBN: 978-1-63485-884-7
Editor: Raquel Watts © 2017 Nova Science Publishers, Inc.
Chapter 4
TISSUE EXAMINATION IN A
DIAGNOSTIC PROCEDURE
Pavla Flodrova
1,*
, Tomas Pika
2
and Patrik Flodr
1
1
Department of Clinical and Molecular Pathology,
Faculty of Medicine and Dentistry,
Palacky University Olomouc, Czech Republic
2
Department of Hemato-oncology,
University Hospital Olomouc, Czech Republic
ABSTRACT
Apart from a general clinical examination, a tissue biopsy with the
morphological proof of amyloid deposits plays an unsubstitutable role in
making a diagnosis. In cases of systemic diseases, a biopsy could be
untargeted at first (subcutaneous fat, small labial glands, rectal mucosa,
and tongue) and followed by a targeted biopsy of the involved organ
(heart or kidney) when the first untargeted specimen was not diagnostic.
In methods of special histological staining, amyloid reacts positively
with histochemical dyes Congo red or Sirius red, a metachromatic
staining (methyl violet) can also be used. Characteristic properties of
amyloid using Congo red stained slides seen under polarized light are
required for the diagnosis.
*
Corresponding author: latalova.pavla@seznam.cz.

Pavla Flodrova, Tomas Pika and Patrik Flodr
74
An ultrastructure of amyloid deposits is demonstrated by using an
electron microscope, where non-branching fibrils composed of
protofibrils can be seen.
Nowadays a determination of a specific amyloid type is dominantly
based on immunological methods with an antigen-antibody
reaction (immunohistochemistry, immunofluorescence, or less used
immunoelectron microscopy), that is the indirect evidence of the
protein. Several difficulties have been described in immunohisto-
chemistochemical examination of formalin-fixed paraffin embedded
tissue samples. For example, the heterogeneity of variable domains of
light chains, antigen masking due to protein folding, or contamination of
amyloid deposits by serum proteins could reduce reliability of the testing
using an immunohistochemical method.
To avoid problems with nonspecific protein detection, the new
methodology based on mass spectrometry seems to be highly specific and
sensitive with the direct protein recognition in a small piece of tissue
sample. Liquid chromatography-mass spectrometry is an analytic
chemistry technique and a well established powerful proteomic tool
which allows an identification of the amyloidogenic protein and other
amyloid-associated molecules as well (serum amyloid P component,
apolipoproteins). These form usual constituent parts of the amyloid and
may serve as an ancillary diagnostic approach. Laser microdissection of
amyloid deposit from histological sections significantly increases the
accuracy and reliability of the LC-MS analysis and is preferred.
INTRODUCTION
Amyloidosis as a disease includes an incoherent group of amyloid
subtypes. Although the aetiology and pathogenesis of amyloidosis are diverse
according to individual subtypes of the disease, regardless of the subtype it can
be defined as an extracellular accumulation of insoluble or poorly soluble
complex deposits in various tissues and organs in the body. Amyloid deposits
could be local or more often systemic involving various types of tissues. The
beginning of the amyloid history is associated with Rudolph Virchow, who
described macroscopically a substance in brain tissue, which was recognized
by characteristic tinctorial properties when treated with iodine and sulphuric
acid treatment [1]. Conditions that underlie the origin of amyloidosis, are
connected either with inherent instability of a native wild-type protein, or
overproduction of a normal protein with reduced stability and increased
propensity to misfold or with production of an abnormal unstable protein [2].

Tissue Examination in a Diagnostic Procedure
75
For a long time, it was not of physicians and investigators’ primary
interest. The reasons were primarily the absence of adequate therapy,
knowledge of aetiology, and pathogenesis of the disease and last but not least
late diagnoses of patients in advanced and incurable stages. With significant
improvement of precise diagnostic methods and new drug and therapy
possibilities in last decades, this diagnosis gains an adequate attention through
the whole spectrum of research and medical teams.
Protein misfolding has been described as a feature in many pathological
conditions ranging from neurodegenerative disorders to amyloidosis. From
clinical point of view, in genuine amyloidosis the deposits are unequivocally
harmful and cause the disease; there is no clinical or pathological evidence of
disease in the absence of such deposits (deposits of amyloid can also be found
in the Islet of Langerhans of pancreatic tissue in some patients with diabetes
mellitus II, but there is no evidence of amyloidosis in these patients since
deposits do not cause the disease) [3]. On the other hand, modern biophysical
definition of the term amyloid reads unbranching protein fibre the repeating
substructure of which consists of β strands that run perpendicular to the fibre
axis, forming a cross-β sheet of indefinite length [30], with the designation of
“amyloid fibril” when they accumulate extracellularly and propose
“intracellular inclusions” in case of fibrils morphologically and structurally
related to extracellular amyloid form inside the cell [4]. Since the deposits are
not a necessary condition for diseases such Alzheimer’s disease, Parkinson’s
disease and prion diseases, finding of abnormal protein aggregates in these
conditions should not be called amyloidosis [3]. The term “functional
amyloid” was established to define the amyloid structure found to have
beneficial function for a living organism and this was supported by increasing
findings of fibrillar aggregates with no link to protein deposition disease.
Some organisms (bacteria as well as higher organisms) are able to transform a
normal endogenous protein into amyloid fibrils during their physiological life
and this process is thought to be useful for specific and specialized biological
functions and takes place under highly controlled conditions [4].
HISTOPATHOLOGY IN BASIC AND SPECIAL STAINS
A histological examination with a proof of amyloid deposits is necessary
to make a diagnosis. In cases of systemic diseases, a biopsy could be
untargeted at first (subcutaneous fat, small labial glands, rectal mucosa, and

Pavla Flodrova, Tomas Pika and Patrik Flodr
76
tongue) and followed by a targeted biopsy of the involved organ (heart or
kidney) when the first untargeted specimen was not diagnostic.
Basic staining in histology, the hematoxylin-eosin, gives an eosinophilic
colour in amyloid deposits as well as other proteinaceous substances in tissues.
In methods of special histologic staining, amyloid reacts with Congo red and
Sirius red label and metachromatic staining (methyl violet) can also be used.
Figure 1. Kidney, Congo red, original magnification 100x. Massive amyloid deposition
in glomeruli, which is characteristic for amyloid based on fibrinogen.
Figure 2. Rectal biopsy, Congo red (A) and Sirius red (B) in original magnification
200x. Very few blood vessels with intramural deposition of amyloid can cause serious
diagnostic problem due to the oversight.
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