Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Ochronosis in a murine model of alkaptonuria is synonymous to that in the human condition
AU - Taylor, Adam
AU - Preston, A. J.
AU - Paulk, N. K.
AU - Sutherland, H.
AU - Keenan, C. M.
AU - Wilson, P. J. M.
AU - Wlodarski, Brenda
AU - Grompe, M.
AU - Ranganath, L. R.
AU - Gallagher, J. A.
AU - Jarvis, Jonathan C.
PY - 2012/8
Y1 - 2012/8
N2 - OBJECTIVE:Alkaptonuria (AKU) is a rare genetic disease which results in severe early onset osteoarthropathy. It has recently been shown that the subchondral interface is of key significance in disease pathogenesis. Human surgical tissues are often beyond this initial stage and there is no published murine model of pathogenesis, to study the natural history of the disease. The murine genotype exists but it has been reported not to demonstrate ochronotic osteoarthropathy consistent with the human disease. Recent anecdotal evidence of macroscopic renal ochronosis in a mouse model of tyrosinaemia led us to perform histological analysis of tissues of these mice that are known to be affected in human AKU.DESIGN:The homogentisate 1,2-dioxygenase Hgd(+/)(-)Fah(-)(/)(-) mouse can model either hereditary tyrosinaemia type I (HT1) or AKU depending on selection conditions. Mice having undergone Hgd reversion were sacrificed at various time points, and their tissues taken for histological analysis. Sections were stained with haematoxylin eosin (H&E) and Schmorl's reagent.RESULTS:Early time point observations at 8 months showed no sign of macroscopic ochronosis of tissues. Macroscopic examination at 13 months revealed ochronosis of the kidneys. Microscopic analysis of the kidneys revealed large pigmented nodules displaying distinct ochre colouration. Close microscopic examination of the distal femur and proximal fibula at the subchondral junctions revealed the presence of numerous pigmented chondrocytes.CONCLUSIONS: Here we present the first data showing ochronosis of tissues in a murine model of AKU. These preliminary histological observations provide a stimulus for further studies into the natural history of the disease to provide a greater understanding of this class of arthropathy.
AB - OBJECTIVE:Alkaptonuria (AKU) is a rare genetic disease which results in severe early onset osteoarthropathy. It has recently been shown that the subchondral interface is of key significance in disease pathogenesis. Human surgical tissues are often beyond this initial stage and there is no published murine model of pathogenesis, to study the natural history of the disease. The murine genotype exists but it has been reported not to demonstrate ochronotic osteoarthropathy consistent with the human disease. Recent anecdotal evidence of macroscopic renal ochronosis in a mouse model of tyrosinaemia led us to perform histological analysis of tissues of these mice that are known to be affected in human AKU.DESIGN:The homogentisate 1,2-dioxygenase Hgd(+/)(-)Fah(-)(/)(-) mouse can model either hereditary tyrosinaemia type I (HT1) or AKU depending on selection conditions. Mice having undergone Hgd reversion were sacrificed at various time points, and their tissues taken for histological analysis. Sections were stained with haematoxylin eosin (H&E) and Schmorl's reagent.RESULTS:Early time point observations at 8 months showed no sign of macroscopic ochronosis of tissues. Macroscopic examination at 13 months revealed ochronosis of the kidneys. Microscopic analysis of the kidneys revealed large pigmented nodules displaying distinct ochre colouration. Close microscopic examination of the distal femur and proximal fibula at the subchondral junctions revealed the presence of numerous pigmented chondrocytes.CONCLUSIONS: Here we present the first data showing ochronosis of tissues in a murine model of AKU. These preliminary histological observations provide a stimulus for further studies into the natural history of the disease to provide a greater understanding of this class of arthropathy.
KW - Alkaptonuria
KW - Mouse model
KW - Arthropathy
KW - Arthritis
KW - Ochronosis
U2 - 10.1016/j.joca.2012.04.013
DO - 10.1016/j.joca.2012.04.013
M3 - Journal article
VL - 20
SP - 880
EP - 886
JO - Osteoarthritis and Cartilage
JF - Osteoarthritis and Cartilage
SN - 1522-9653
IS - 8
ER -