alphaB-crystallin (HspB5) in familial amyloidotic polyneuropathy.
Summary of "alphaB-crystallin (HspB5) in familial amyloidotic polyneuropathy."
Summary The small heat shock protein alphaB-crystallin (HspB5) is known to be overexpressed in several neurodegenerative disorders. In familial amyloidotic polyneuropathy (FAP), a neurodegenerative disorder characterized by extracellular deposition of mutated transthyretin (TTR), activation of heat shock factor 1 -HSF1- by extracellular TTR deposition has been shown as well as induction of the expression of heat shock proteins, HSP27 and HSP70. Here we investigate the expression of alphaB-crystallin in FAP. We first detected alphaB-crystallin in aggregates extracted from tissues of both FAP patients and transgenic mice for the human V30M mutant TTR; however, subsequent studies by confocal fluorescence microscopy did not confirm the association of alphaB-crystallin with TTR aggregates; thus the presence of alphaB-crystallin in aggregate extracts might derive from the extraction procedure. Increased levels of alphaB-crystallin were observed by immunohistochemistry in human FAP skin, as compared to normal skin. Furthermore, skin, stomach and dorsal root ganglia from V30M transgenic mice showed increased expression of alphaB-crystallin as compared to controls without deposition. A human neuroblastoma cell line incubated with TTR aggregates displayed increased expression of alphaB-crystallin. Overall, these results show that extracellular TTR deposits induce an intracellular response of alphaB-crystallin. This small heat shock protein (HSP), which is important for anti-apoptotic and chaperone properties, may have a protective role in FAP.
IBMC, Instituto de Biologia Molecular e Celular, Porto, Portugal.
This article was published in the following journal.
Name: International journal of experimental pathology
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20804537
- DOI: http://dx.doi.org/10.1111/j.1365-2613.2010.00735.x
Medical and Biotech [MESH] Definitions
Alpha-crystallin B Chain
One of the alpha crystallin subunits. In addition to being expressed in the lens (LENS, CRYSTALLINE), alpha-crystallin B chain has been found in a variety of tissues such as HEART; BRAIN; MUSCLE; and KIDNEY. Accumulation of the protein in the brain is associated with NEURODEGENERATIVE DISEASES such as CREUTZFELDT-JAKOB SYNDROME and ALEXANDER DISEASE.
Alpha-crystallin A Chain
One of the subunits of alpha-crystallins. Unlike ALPHA-CRYSTALLIN B CHAIN the expression of ALPHA-CRYSTALLIN A CHAIN is limited primarily to the lens (LENS, CRYSTALLINE).
A diffuse or multifocal peripheral neuropathy related to the remote effects of a neoplasm, most often carcinoma or lymphoma. Pathologically, there are inflammatory changes in peripheral nerves. The most common clinical presentation is a symmetric distal mixed sensorimotor polyneuropathy. (Adams et al., Principles of Neurology, 6th ed, p1334)
An autosomal recessive familial disorder that usually presents in childhood with POLYNEUROPATHY; SENSORINEURAL HEARING LOSS; ICHTHYOSIS; ATAXIA; RETINITIS PIGMENTOSA; and CARDIOMYOPATHIES. (From Joynt, Clinical Neurology, 1991, Ch37, p58-9; Rev Med Interne 1996;17(5):391-8) This condition can be caused by mutation in the genes encoding peroxisomal phytanoyl-CoA hydroxylase or proteins associated peroxisomal membrane, leading to impaired catabolism of PHYTANIC ACID in PEROXISOMES.
A class of crystallins that provides refractive power and translucency to the lens (LENS, CRYSTALLINE) in VERTEBRATES. Beta-crystallins are similar in structure to GAMMA-CRYSTALLINS in that they both contain Greek key motifs. Beta-crystallins exist as oligomers formed from acidic (BETA-CRYSTALLIN A CHAIN) and basic (BETA-CRYSTALLIN B CHAIN) subunits.
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