Staging of Alzheimer disease-associated neurofibrillary pathology using paraffin sections and immunocytochemistry
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Assessment of Alzheimer’s disease (AD)-related neurofibrillary pathology requires a procedure that permits a sufficient differentiation between initial, intermediate, and late stages. The gradual deposition of a hyperphosphorylated tau protein within select neuronal types in specific nuclei or areas is central to the disease process. The staging of AD-related neurofibrillary pathology originally described in 1991 was performed on unconventionally thick sections (100 μm) using a modern silver technique and reflected the progress of the disease process based chiefly on the topographic expansion of the lesions. To better meet the demands of routine laboratories this procedure is revised here by adapting tissue selection and processing to the needs of paraffin-embedded sections (5–15 μm) and by introducing a robust immunoreaction (AT8) for hyperphosphorylated tau protein that can be processed on an automated basis. It is anticipated that this revised methodological protocol will enable a more uniform application of the staging procedure.
KeywordsAlzheimer’s disease Neurofibrillary changes Immunocytochemistry Hyperphosphorylated tau protein Neuropathologic staging Pretangles
The development of intraneuronal lesions at selectively vulnerable brain sites is central to the pathological process in Alzheimer’s disease (AD) [42, 46, 55, 56, 58, 94]. The lesions consist chiefly of hyperphosphorylated tau protein and include pretangle material, neurofibrillary tangles (NFTs) in cell bodies, neuropil threads (NTs) in neuronal processes, and material in dystrophic nerve cell processes of neuritic plaques (NPs) [7, 19, 30].
For routine diagnostic purposes, however, such a system is problematic because it calls for unusually thick sections cut from blocks embedded in an unconventional medium [polyethylene glycol (PEG)] . In addition, the method requires that free floating sections be stained by experienced laboratory assistants using a non-automated silver technique. These features drastically limit the feasibility of the original staging protocol for routine diagnostic use in the majority of neuropathological laboratories . At the same time, they account for the fact that the staging system has found broad acceptance in a research context while having been subjected to numerous modifications [9, 18, 36, 39, 40, 53, 59, 60, 61, 62, 69, 70, 71, 75, 76, 83, 88]. Neuropathologists in routine diagnostic praxis as well as reference centers that maintain brain banks are interested in a uniform staging procedure so that the material submitted by various participating institutions can be used and evaluated according to the same criteria. Such a staging system must be reproducible, cost-effective, and easy.
In recent years, sensitive immunocytochemical methods have been developed, the application of which makes it possible to reliably detect not only incipient neurofibrillary pathology in mildly involved brain regions of non-symptomatic individuals but also, with disease progression, the full extent of the intraneuronal pathology in the end phase [19, 90]. Neurofibrillary changes of the Alzheimer type consist of stable proteins that are impervious to postmortal delay or suboptimal fixation conditions, and immunoreactions for demonstration of hyperphosphorylated tau protein can be carried out even on tissue that has been stored for decades in formaldehyde [1, 72].
In view of the progress that has been made in the demonstration of the neurofibrillary changes of the Alzheimer type, it seemed expedient to revise the 1991 staging procedure by introducing immunoreactions for visualization of hyperphosphorylated tau and by adapting the tissue selection and processing to the demands of the routine diagnostic laboratory. The goal remains the same, namely to stage the AD-related neurofibrillary pathology in six stages, as previously, with emphasis this time on the plexuses formed of both pretangle and tangle material, but using paraffin sections immunostained for hyperphosphorylated tau and processed on an automated basis. To illustrate the advantages and disadvantages of both methods, required brain regions with lesions representing AD stages I–VI have been digitally photographed both in silver- and immunostained 100 μm PEG sections and in 7 μm paraffin sections immunostained for hyperphosphorylated tau protein (AT8–antibody). The revised procedure is intended to facilitate the uniform application of the staging procedure, which now can be performed with greater efficiency than previously.
Fixation and macroscopic preparation
Brains obtained at autopsy should be fixed by immersion in 10% formalin (4% aqueous solution of HCHO) for one week or longer. Partially remove the meninges to uncover the rhinal sulcus, collateral sulcus, and calcarine fissure (Fig. 1a–d).
Whereas the original staging procedure requires evaluation of thick silver-stained sections from two relatively large blocks of cortical tissue, the revised version uses immunostained paraffin sections microtomed from three blocks of conventional size that fit routine tissue cassettes. Figure 1d shows the cutting lines for removal of the three blocks and, in addition, those for the classical view of the hippocampal formation. Alternatively, the tissue on one side of a cut can be used for conventional paraffin embedding (thin sections), and that on the other side for PEG embedding (thick sections).
The first block includes anteromedial portions of the temporal lobe cut at the mid-uncal or amygdala level (frontal section through the temporal lobe at the level of the mamillary bodies) encompassing anterior portions of both the parahippocampal gyrus and adjoining occipito-temporal gyrus. The cutting line runs through the rhinal sulcus (Fig. 1a, d). The sections from this block contain central portions of the entorhinal region and the adjoining transentorhinal region, the latter of which is concealed in the depths of the rhinal sulcus [23, 98]. This block is essential for assessment of neurofibrillary AD stages I–III.
The second block simplifies assessment of stage IV. It is obtained from the same slice as the first block and includes portions of the medial and superior temporal gyri (Fig. 1a, d). As an alternative to the first two blocks, the entire slice through the temporal lobe can be used, provided slides of sufficient size are available. Reduction of this slice to two blocks is recommended to avoid exceeding the size of conventional tissue cassettes.
The third block is removed halfway between the occipital pole and the junction of the parieto-occipital sulcus with the calcarine fissure. The cut is oriented perpendicular to the calcarine fissure (Fig. 1c, d). Again, the size of the block has been reduced to fit standard tissue cassettes. Care has to be taken that the block includes part of the lower bank of the calcarine fissure and the adjoining basal occipital gyri encompassing portions of the neocortex, i.e., the peristriate region, parastriate field, and a clearly definable primary field, the striate area (Brodmann field 17 with the macroscopically identifiable line of Gennari). This block is indispensable for recognition of the neurofibrillary AD stages V and VI.
Mounted paraffin sections of 5–15 μm thickness are de-waxed and re-hydrated.
The monoclonal antibody AT8 (Innogenetics, Belgium) is one of several commercially available specific antibodies that show robust immunoreactivity for hyperphosphorylated tau protein, and a recently published immunocytochemical trial using this antibody has yielded reproducible results . AT8 does not cross-react with normal tau epitopes or require special pre-treatments, and it is exceptionally reliable in human autopsy material regardless of the length of the fixation time in formaldehyde and/or the condition of the preserved tissue [16, 19, 57, 77]. When performed on paraffin sections (5–15 μm), AT8-immunoreactions permit counter-staining for other structures of interest, provided that diaminobenzidine is used as a chromogen. Homogeneous immunoreactions can also be achieved using PEG sections (50–150 μm) (Fig. 2). The sections are incubated for 40 h at 4°C with the AT8 antibody (1:2,000) and thereafter processed for 2 h with the second biotinylated antibody (anti-mouse IgG). Reactions are visualized with the ABC-complex (Vectastain) and 3,3-diaminobenzidine (Sigma).
Prolonged fixation of brain tissue in a formaldehyde solution may cause metachromatic precipitations (Buscaino bodies or mucocytes) . Components of this material partially react with silver methods and also may interfere with immunoreactions. The precipitations can be removed with pyridine or a tenside solution [1 unit volume Tween 20 (Merck-Schuchardt 822184) and 9 unit volumes de-ionized water] at 80°C for 30 min or both. The sections are then rinsed thoroughly under running tap water and transferred to de-ionized water.
Comparison between Gallyas silver- and AT8-immunostained thick (100 μm) sections
Figure 2 is designed to facilitate a direct comparison between selected cortical areas in 100 μm thick PEG-embedded sections. The first section of each pair has been silverstained according to a modified version of the technique originally proposed by Gallyas [22, 31, 49, 50, 51, 67, 68, 78], whereas the second serial section (i.e., back-to-back sections from the identical tissue block) underwent staining with the antibody AT8.
Nonetheless, the distribution pattern of the immunoreactive cortical alterations throughout the various fields that are crucial for staging purposes corresponds to that of the argyrophilic lesions (Fig. 2) and, as such, it allows the observer to trace the progress of the neurofibrillary pathology in both silverstained (Fig. 2) and immunostained sections alike (Fig. 3). The greater emphasis on the abnormal plexuses in AT8-immunoreactive sections, however, facilitates the immediate diagnostic assessment of the stages, as, for instance, is readily evident even in the scaled down photographs of the hemisphere sections shown in Fig. 3. These immunopositive plexuses are still visible macroscopically in paraffin sections (5–15 μm), and it is helpful, initially, without using the microscope, to view all three slides against a light background to assign them preliminarily to a given stage.
The final diagnosis is essentially based on recognition of the topographical distribution pattern of the neurofibrillary pathology and calls for a precise knowledge of which regions in the cerebral cortex, in which sequence, develop the AD-related neurofibrillary lesions. This decision can be made with almost the same degree of accuracy regardless of whether immunostained or silverstained sections are employed, although, based on experience, there is a slight tendency to assign a higher stage to the immunostained slides. The frequency of stage I cases, for example, is somewhat higher in AT8-immunostained sections because in the incipient phases of the disease process AT8-immunopositive nerve cells appear that still lack argyrophilic material. Thus, it is advisable to perform the staging procedure using either the Gallyas or AT8 technique but not both methods.
The staging system
AD-related neurofibrillary changes occur at predisposed cortical and subcortical sites. The distribution pattern and developmental sequence of the lesions are predictable and permit identification of six stages, which can be subsumed under three more general units: I–II, III–IV, V–VI [4, 5, 6, 21, 28, 32, 37, 38, 47, 65, 66, 83]. Initial diagnosis as to whether the bulk of the abnormal tau protein is detectable in the transentorhinal and entorhinal regions (stages I–II), in the limbic allocortex and adjoining neocortex (stages III–IV), or in the neocortex, including the secondary and primary fields (stages V–VI), simplifies the subsequent task of differentiation.
Cases without cortical AD-related neurofibrillary pathology
Major characteristics of stages I–II
Subcortical nuclei (i.e., locus coeruleus, magnocellular nuclei of the basal forebrain) occasionally show the earliest alterations in the absence of cortical involvement . The transentorhinal region is the first site in the cerebral cortex to become involved. AT8-immunoreactive (ir) projection cells contain hyperphosphorylated tau in both the cell body and all of its neuronal processes (Fig. 4c, d). Late phases of the stage show abundant AT8-ir neurons that permit recognition of the descent of the superficial entorhinal cellular layer (pre-α, i.e., the outer layer-α of the external principal lamina) from its uppermost position at the entorhinal border to its deepest position at the transition towards the adjoining temporal neocortex (Figs. 1, 3a) . The entorhinal region proper remains uninvolved or minimally involved.
From the transentorhinal region, the lesions encroach upon the entorhinal region, particularly its superficial cellular layer, pre-α (Figs. 1, 3b, 4e–g). The deep layer, pri-α, gradually becomes visible (Figs. 2f, 3b, 4e), shows sharply defined upper and lower boundaries, and is separated from pre-α by the broad, wedge-shaped lamina dissecans (myelinated fiber plexus) [23, 98]. AT8-ir pyramidal cells appear in sectors 1 and 2 of the hippocampal Ammon’s horn (CA1/CA2) (Fig. 3b). Dilations develop transiently in apical dendrites that pass through the stratum lacunosum moleculare of CA1 . Scattered NPs appear in CA1. Fine networks of AT8-ir neurites form in both the stratum radiatum and stratum oriens.
Major characteristics of stages III–IV
Stage III: Lesions extend into the neocortex of the fusiform and lingual gyri (Figs. 2i–n, 3c, d, 4h)
The lesions in stage II sites become more severe. The outer entorhinal cellular layers (pre-α, pre-β, pre-γ) and most of the molecular layer become filled with intermeshing AT8-ir neurites, whereas the pale lamina dissecans contains a few radially oriented neurites. The deep layer pri-α is heavily affected and gradually thins in the transentorhinal region as it approaches the temporal neocortex (Figs. 3c, 4h). CA1 appears band-like, and transient dendritic changes in CA1 reach their culmination point . CA2 is filled with large and strongly AT8-ir pyramidal cells. A moderate number of mossy cells with characteristic dendritic excrescences appear in CA3 and CA4 . The granule cells of the fascia dentata remain uninvolved. AT8-ir sections showing the classical view of the hippocampal formation (Figs. 1b, d) facilitate recognition of lesions in the fascia dentata and Ammon’s horn .
From the transentorhinal region, the lesions encroach upon the neocortex of the fusiform and lingual gyri, and then diminish markedly beyond this point (Figs. 3d, 4j). An AT8-ir plexus fills the cellular layers of the temporal neocortex (Figs. 2n, 4l). The outer line of Baillarger is barely developed and gradually becomes recognizable only with increasing distance from the transentorhinal region. A few NPs develop in the outer layers II–IV.
Stage IV: The disease process progresses more widely into neocortical association areas (Figs. 2o–t, 3e, 5a)
Lesional density increases in sites affected in stage III. A few AT8-ir pyramidal cells appear in the subiculum. The density of the neuritic plexuses of the entorhinal and transentorhinal regions increases and causes a corresponding blurring of the lamina dissecans. The deep plexus spans all of the deep layers: pri-α, pri-β, and pri-γ, and from there penetrates widely into the white substance. This aspect of maximum involvement undergoes little change until the end-phase of AD. Thus, the pathological features of the entorhinal and transentorhinal regions must not be taken into account for further differentiation of stages V and VI. CA1/CA2 are recognizable as dense bands. The varicose dendritic segments vanish from CA1 without leaving behind any remnants. Large numbers of mossy cells in CA3 and CA4 become AT8-ir. A few AT8-ir granule cells appear in the fascia dentata.
Major characteristics of stages V–VI:
Stage V: The neocortical pathology extends fanlike in frontal, superolateral, and occipital directions, and reaches the peristriate region (Figs. 2u–x, 3f, g, 5f, j)
From sites involved at stage IV, the lesions appear in hitherto uninvolved areas and extend widely into the first temporal convolution (Fig. 3f) as well as into high order association areas of the frontal, parietal, and occipital neocortex (peristriate region, Figs. 2v–x, 3g). Initially, unevenly and loosely distributed NPs appear in layers II and III, followed by large numbers of AT8-ir pyramidal cells in layers IIIa, b and V. The lower border of the outer neuritic plexus in layers II-IIIab blurs at its transition to the uninvolved layers IIIc and IV (outer line of Baillarger, Fig. 5g). In stage V, the deep plexus of layer V is narrow and tends not to extend into layer VI and the white matter (Fig. 5g, h). The same pattern (only less pronounced) is seen in secondary areas of the neocortex, where uneven accumulations of NPs predominate. Affection of layer V is weak (Fig. 5j). The primary visual field (striate area) contains only isolated signs of the pathology consisting of NPs (Fig. 5i, j). Isolated AT8-ir neurons also can be seen in layer IIIab (Fig. 5i, j).
Stage VI: The pathology reaches the secondary and primary neocortical areas and, in the occipital lobe, extends into the striate area (Figs. 2y–z″, 3h, i)
Most areas of the neocortex show severe affection and nearly all layers are filled with AT8-ir neurites. As such, the outer line of Baillarger—a pallid stripe in stage V—begins to blur (Fig. 5l). Layer V still appears as a recognizable band but continues into the neuritic plexus of layer VI. The underlying white substance contains AT8-ir axons. A decrease in immunoreactivity of NPs is seen in many neocortical areas and is most pronounced in the basal temporal fields. In the occipital lobe, the pathology breaches the parastriate and striate areas (Figs. 2y–z″, 3i, 5m–o). Large numbers of NPs and AT8-ir nerve cells appear in layers II and IIIab. Baillarger’s outer line or the line of Gennari maintains a light appearance, interrupted only by radially oriented AT8-ir neurites. A sharply drawn AT8-ir plexus follows in layer V (Figs. 2z, z″, 5n, o).
By applying the silver technique proposed by Bielschowsky [11, 12, 13, 14, 15] Alzheimer [2, 3] became the first to describe the NFTs that develop in the course of the disease that bears his name. This staining technique has been in use for decades but has been subjected to numerous modifications [10, 33, 36, 48, 52, 74, 99]. In systematic studies, Gallyas [49, 50] replaced the critical steps of the Bielschowsky technique by means of more manageable reactions and developed a reliable method for selectively demonstrating AD-related neurofibrillary changes. Following its adaptation for use on 100 μm thick sections, this method was standardized for a procedure to stage the development of the cortical AD-related neurofibrillary pathology that gradually found international acceptance [64, 66, 83]. Nonetheless, one of the unavoidable pitfalls associated with using silverstaining techniques is that different laboratories produce results of widely varying quality . Subsequently, the 1991 staging protocol, too, underwent a series of permutations, among them the application of various types of silver impregnations, the analysis of cortical sites that are fundamentally less well suited for the procedure, and the use of tissue sections, the thickness of which differed from that originally proposed [8, 9, 18, 21, 22, 36, 39, 40, 41, 53, 54, 59, 60, 61, 69, 70, 71, 75, 76, 78, 83]. A radical reduction of the different stages also has been suggested .
Since AD is an ongoing and not a static process, every staging procedure is, de facto, an artificial construct. It is the extent of brain involvement rather than qualitative changes in the neurofibrillary pathology that increases with disease progression and, as such, the concept of six neuropathological stages (and only six stages) is not entirely amenable to pathological states of a “transitional” nature that do not fulfill the criteria for one of the six neurofibrillary stages described above.
Here, a revised version of the 1991 staging procedure is presented that can be performed on paraffin sections of conventional thickness, which have been immunostained with the AT8 antibody and processed on an automated basis, thereby fulfilling the demands of the routine laboratory. The simplicity and uniformity of any staging system is the prerequisite for effective comparisons of results among laboratories and for reliable as well as reproducible classification of a disease process [35, 86].
The previous staging protocol relied upon an advanced but inexpensive silver technique that exploits the physical development of the nucleation sites and in so doing permits careful control of the entire staining procedure [49, 50, 51]. Insoluble fibrillary AD-related material can be visualized virtually in the absence of distracting background staining [66, 67, 78]. The technique can be applied to routinely fixed autopsy material, even when the material has been stored for decades in formaldehyde solutions. It facilitates processing of large numbers and/or large sections (e.g., hemisphere sections). A homogeneous staining that permeates the entire thickness of a section is achieved even in 50–150 μm sections . Thin paraffin sections (5–15 μm) can also be used and counter-stained for easy identification of cytoarchitectonic units or specific nuclei . Neurofibrillary changes of the Alzheimer type (NFTs, NTs, NPs) appear in black and, thus, contrast well against an almost unstained background. Connective tissue, glial filaments, normal components of the neuronal cytoskeleton, Pick bodies, Lewy bodies/neurites, and corpora amylacea remain unstained. Abnormal tau-protein in argyrophilic grain disease (AGD), in progressive supranuclear palsy (PSP), corticobasal degeneration (CBD), and Niemann Pick type C (NPC) can be visualized as well [46, 78].
The staging procedure originally required sectioning at a thickness of 100 μm. Silverstained or immunostained sections of such thickness are optimal for the demands of low power (stereo) microscopy and greatly facilitate recognition of the laminar and areal distribution pattern of the lesions (see hemisphere sections in Fig. 3). Sections of this thickness can be gained from non-embedded brain tissue with the aid of a vibratome or a freezing microtome. Alternatively, the tissue blocks can be embedded in PEG  and sectioned with a sliding microtome. Application of PEG (400 and 1,000: Merck-Schuchardt 807 485 and 807 488) is rapid, simple, and causes little shrinkage .
The blocks are transferred from 96% ethanol to PEG 400 and their surfaces covered with blotting paper. Blocks are placed on a rotating table and after having sunk to the bottom (this can take several days), they are transferred to fresh PEG 400 for an additional day. Then, transfer to PEG 1000 at 54°C for 1 day. Embed in fresh PEG 1000, mount, and section at 50–150 μm. Transfer sections to 70% ethanol to remove the embedding medium. Store sections in formaldehyde solutions. Prior to staining, transfer sections to de-ionized water. It is important to note that the Gallyas silver technique displays only highly aggregated fibrillary material, whereas the AT8-immunoreaction also visualizes the non-argyrophilic material that initially develops within involved neurons (pretangle material).
The skillful assistance (tissue processing and staining) of Dr. R.A. Kauppinen (Kuopio), Mr. M. Bouzrou (Frankfurt/Main), and (illustrations) Ms. I. Szász (Frankfurt/Main) is gratefully acknowledged.
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