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- Elf, Kristin, et al.
(författare)
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Alterations in muscle proteome of patients diagnosed with amyotrophic lateral sclerosis
- 2014
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Ingår i: Journal of Proteomics. - : Elsevier BV. - 1874-3919 .- 1876-7737. ; 108, s. 55-64
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Tidskriftsartikel (refereegranskat)abstract
- Amyotrophic lateral sclerosis (ALS) is a motor neuron disease characterized by progressive muscle paralysis. Currently clinical tools for ALS diagnostics do not perform well enough and their improvement is needed. The objective of this study was to identify specific protein alterations related to the development of ALS using tiny muscle biopsies. We applied a shotgun proteomics and quantitative dimethyl labeling in order to analyze the global changes in human skeletal muscle proteome of ALS versus healthy subjects for the first time. 235 proteins were quantified and 11 proteins were found significantly regulated in ALS muscles. These proteins are involved in muscle development and contraction, metabolic processes, enzyme activity, regulation of apoptosis and transport activity. In order to eliminate a risk to confuse ALS with other denervations, muscle biopsies of patients with postpolio syndrome and Charcot Marie Tooth disease (negative controls) were compared to those of ALS and controls. Only few proteins significantly regulated in ALS patients compared to controls were affected differently in negative controls. These proteins (BTB and kelch domain-containing protein 10, myosin light chain 3, glycogen debranching enzyme, transitional endoplasmic reticulum ATPase), individually or as a panel, could be selected for estimation of ALS diagnosis and development. Biological significance ALS is a devastating neurodegenerative disease, and luckily, very rare: only one to two people out of 100,000 develop ALS yearly. This fact, however, makes studies of ALS very challenging since it is very difficult to collect the representative set of clinical samples and this may take up to several years. In this study we collected the muscle biopsies from 12 ALS patients and compared the ALS muscle proteome against the one from control subjects. We suggested the efficient method for such comprehensive quantitative analysis by LC-MS and performed it for the first time using human ALS material. This gel- and antibody-free method can be widely applied for muscle proteome studies and has been used by us for revealing of the specific protein alterations associated with ALS.
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| 2. |
- Elf, Kristin, et al.
(författare)
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Vitamin D deficiency in patients with primary immune-mediated peripheral neuropathies
- 2014
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Ingår i: Journal of the Neurological Sciences. - : Elsevier BV. - 0022-510X .- 1878-5883. ; 345:1-2, s. 184-188
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: T cells are important in the immunopathology of immune-mediated peripheral neuropathies (PNP) and activated vitamin D regulates the immune response through increasing the amount of regulatory T cells. An association between vitamin D deficiency and polyneuropathy has been stipulated; hence we assessed whether patients with primary immune-mediated PNP have low vitamin D [25(OH)D] levels.METHODS: Plasma levels of 25(OH)D were analyzed in 26 patients with primary immune-mediated PNP, 50 healthy matched blood donors and 24 patients with motor neuron disease (MND). INCAT score was assessed in patients with Guillain-Barré syndrome and chronic inflammatory demyelinating polyneuropathy. ALSFRS-R score was applied to MND patients and the modified Rankin (mRankin) scale compared disability among patient groups.RESULTS: Mean 25(OH)D value in PNP patients was 40±16nmol/l, compared to 69±21nmol/l in healthy blood donors (p<0.001). MND patients had a higher mean 25(OH)D than PNP patients (59±26nmol/L; p=0.006) and comparable levels to healthy blood donors (p=0.15). Mean 25(OH)D value was not higher in PNP patients with pre-existing vitamin D3 supplementation of 800IU/day (N=6; 35±18nmol/L) than in unsupplemented PNP patients (42±16nmol). INCAT score ranged from 0 to 10 (mean 3.5) and ALSFRS-R ranged from 11 to 44 (mean 31). mRankin score was more severe in MND patients (mean 3.5) compared to PNP patients (mean 2.1).CONCLUSIONS: All patients with primary immune-mediated PNP were diagnosed with vitamin D deficiency and they had significantly lower 25(OH)D values than healthy control persons and MND patients. We suggest monitoring of vitamin D status in patients with autoimmune PNP, since immune cells are responsive to the ameliorative effects of vitamin D.
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