TY - JOUR
T1 - Accumulation of intracellular amyloid-β peptide (Aβ 1-40) in mucopolysaccharidosis brains
AU - Ginsberg, Stephen D.
AU - Galvin, James E.
AU - Lee, Viginia M.Y.
AU - Rorke, Lucy B.
AU - Dickson, Dennis W.
AU - Wolfe, John H.
AU - Jones, Margaret Z.
AU - Trojanowski, John Q.
PY - 1999/8
Y1 - 1999/8
N2 - To evaluate whether in vivo accumulations of heparan sulfate caused by inborn errors in the metabolism of glycosaminoglycans lead to the formation of neurofibrillary tangles and/or senile plaques, as seen in Alzheimer disease (AD), we studied postmortem brains from 9 patients, ages 1 to 42 years, with mucopolysaccharidosis (MPS). The brains of patients with Hurler's syndrome (MPS I; n = 5) and Sanfilippo's syndrome (MPS III; n = 4) as well as from caprine MPS IIID and murine MPS VII models were evaluated by thioflavine-S staining and by immunohistochemistry using antibodies directed against heparan sulfate proteoglycans, hyperphosphorylated tau, amyloid-β peptide precursor proteins (APP), and amyloid-β peptides (Aβ [1-40], and Aβ [1-42]). A two-site sandwich enzyme-linked immunosorbent assay (ELISA) was also utilized to compare levels of total soluble and insoluble Aβ (1-40) and Aβ (1-42) obtained from temporal cortex of MPS patients. Although no neurofibrillary tangles, senile plaques, or tau-positive lesions were detected in any of the MPS brains studied here, antibodies directed against Aβ (1-40) intensely and diffusely stained the cytoplasm of cells throughout the brains of the MPS patients and the caprine MPS model. The ELISA assay also demonstrated a significant 3-fold increase in the level of soluble Aβ (1-40) in the MPS brains compared with normal control brains. Thus, at least some of the metabolic defects that lead to accumulations of glycosaminoglycans in MPS also are associated with an increase in immunoreactive Aβ (1:40) within the cytoplasmic compartment where they could contribute to the dysfunction and death of affected cells in these disorders, but not induce the formation of plaques and tangles. Models of MPS may enable mechanistic studies of the role Aβ and glycosaminoglycans play in the amyloidosis that is a neuropathological feature of AD.
AB - To evaluate whether in vivo accumulations of heparan sulfate caused by inborn errors in the metabolism of glycosaminoglycans lead to the formation of neurofibrillary tangles and/or senile plaques, as seen in Alzheimer disease (AD), we studied postmortem brains from 9 patients, ages 1 to 42 years, with mucopolysaccharidosis (MPS). The brains of patients with Hurler's syndrome (MPS I; n = 5) and Sanfilippo's syndrome (MPS III; n = 4) as well as from caprine MPS IIID and murine MPS VII models were evaluated by thioflavine-S staining and by immunohistochemistry using antibodies directed against heparan sulfate proteoglycans, hyperphosphorylated tau, amyloid-β peptide precursor proteins (APP), and amyloid-β peptides (Aβ [1-40], and Aβ [1-42]). A two-site sandwich enzyme-linked immunosorbent assay (ELISA) was also utilized to compare levels of total soluble and insoluble Aβ (1-40) and Aβ (1-42) obtained from temporal cortex of MPS patients. Although no neurofibrillary tangles, senile plaques, or tau-positive lesions were detected in any of the MPS brains studied here, antibodies directed against Aβ (1-40) intensely and diffusely stained the cytoplasm of cells throughout the brains of the MPS patients and the caprine MPS model. The ELISA assay also demonstrated a significant 3-fold increase in the level of soluble Aβ (1-40) in the MPS brains compared with normal control brains. Thus, at least some of the metabolic defects that lead to accumulations of glycosaminoglycans in MPS also are associated with an increase in immunoreactive Aβ (1:40) within the cytoplasmic compartment where they could contribute to the dysfunction and death of affected cells in these disorders, but not induce the formation of plaques and tangles. Models of MPS may enable mechanistic studies of the role Aβ and glycosaminoglycans play in the amyloidosis that is a neuropathological feature of AD.
KW - Amyloid-β peptides
KW - Glycosaminoglycans
KW - Heparan sulfate proteoglycan
KW - Neurofibrillary tangles
KW - Senile plaques
KW - Tau protein
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UR - http://www.scopus.com/inward/citedby.url?scp=0032796126&partnerID=8YFLogxK
U2 - 10.1097/00005072-199908000-00004
DO - 10.1097/00005072-199908000-00004
M3 - Article
C2 - 10446806
AN - SCOPUS:0032796126
SN - 0022-3069
VL - 58
SP - 815
EP - 824
JO - Journal of neuropathology and experimental neurology
JF - Journal of neuropathology and experimental neurology
IS - 8
ER -