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Článek

Degradační produkty kolagenu a elastinu jako možné ukazatele aktivity sklerodermie
[Collagen and elastin degradation products as potential activity markers of scleroderma]

Česká revmatologie. 2009 ; 17 (1) : 23-29.

ISSN 1210-7905
Medvik
Zdroj

Úvod. U systémové (SSc) a lokalizované sklerodermie (LSc) nejsou zatím k dispozici žádné spolehlivé ukazatele aktivity. U obou onemocnění dochází k excesivnímu ukládání vláken kolagenu a elastinu v kůži a podkoží, u SSc navíc v cévní stěně a parenchymu většiny orgánů. Cíle. Cílem této studie bylo stanovit míru degradace kolagenu typu I, exkreci elastinu a sérové koncentrace prozánětlivých cytokinů u SSc a LSc a porovnat tyto skupiny s pacienty s psoriasis vulgaris (PsV) a zdravými jedinci (ZJ). Pacienti a metody. Celkem bylo vyšetřeno 91 jedinců – 24 se SSc, 16 s LSc a jako kontrolní skupiny 37 pacientů s PsV a 14 dárců krve. Močová exkrece pyridinolinu (U-PD) a deoxypyridinolinu (U-DPD) byla měřena pomocí HPLC. Močová exkrece rozpustného elastinu (U-SE) byla hodnocena kvantitativní imunoprecipitační metodou, sérové koncentrace interleukinu-6 (IL-6) a solubilního receptoru pro interleukin-2 (IL-2R) byly stanoveny pomocí souprav ELISA. Všechna měření byla provedena při vstupu a po jednom roce. Výsledky. Hladiny U-PD byly při vstupu a po roce nejvyšší u SSc. Při vstupu byly koncentrace U-PD zvýšené u SSc a LSc ve srovnání se ZJ (u obou skupin p < 0,0001). Pacienti se SSc měli také vyšší hladiny ve srovnání s PsV (p < 0,001). Při vstupu byly U-DPD u SSc zvýšené ve srovnání se ZJ a LSc (p = 0,006 a p < 0,001). Při vstupu byly zvýšené koncentrace U-SE u skupiny PsV ve srovnání se ZJ (p < 0,001). Po roce byly tyto koncentrace významně vyšší u skupin SSc a PsV ve srovnání se ZJ (u obou p = 0,001). Hladiny IL-6 byly při vstupu zvýšené u skupin SSc, LSc a PsV ve srovnání se ZJ (p < 0,0001, p < 0,001 a p = 0,004), po roce však pouze u SSc (p < 0,001). Hladiny IL-2R se nelišily v žádné době. Závěry. Zvýšené ukazatele metabolismu kolagenu a elastinu u SSc a LSc odrážejí aktivní fibrotický proces u těchto nemocí a jsou v souladu s již publikovanými daty. Vysoká exkrece elastinu u nemocných PsV je překvapivá a nemáme pro ni dosud vysvětlení.

Introduction. Systemic (SSc) and localized scleroderma (LSc) do not have reliable activity markers. In both conditions an excessive deposition of collagen and elastin fibrils occurs in the skin and subcutis, and in SSc additionally in vessel walls and in majority of parenchymatous organs. Aims. The aim of this study was to assess the degradation of collagen type I, elastin excretion and proinflammatory cytokines in SSc and LSc compared with patients with psoriasis vulgaris (PsV) and healthy controls (HC). Patients and methods. Total 91 individuals were examined – 24 with SSc, 16 with LSc, and two control groups - 37 patients with PsV and 14 blood donors. Urinary excretion of pyridinoline (U-PD) and deoxypyridinoline (U-DPD) were measured using sensitive isocratic HPLC method. Urinary excretion of soluble elastin (U-SE) ) was evaluated by quantitative immunoprecipitation method, serum levels of interleukin-6 (IL-6) and soluble interleukin-2 receptor (IL-2R) were assayed using commercial ELISA kits. All measurements were performed at entry and after one year. Results. U-PD levels were the highest at entry and after one year in SSc group. At entry U-PD concentrations in SSc and LSc groups were increased compared with HC (p < 0.0001, and p < 0.0001 respectively). SSc patients had also a higher levels compared with PsV group (p < 0.001). At entry U-DPD levels in SSc group were increased compared with HC and LSc (p = 0.006, and p < 0.001 respectively). U-SE was the highest at entry in PsV and one year later in SSc group. At entry U-SE in PsV group were increased compared with HC (p < 0.001). After a year U-SE in SSc and PsV patients were higher compared with HC (for both p = 0.001). IL-6 serum levels were increased at entry in SSc, LSc and PsV groups compared with HC (p < 0.0001, p < 0.001, and p = 0.004 respectively), after one year only SSc had increased levels compared with HC (p < 0.001). IL-2R serum levels did not differ among the studied groups at any time. Conclusions. The increased markers of collagen and elastin turnover in SSc and LSc reflect the active fibrotic process in the diseases and are accordance with the published data. High elastin levels in PsV group are surprising, and we have so far no explanation for this result.

MeSH
elastin diagnostické užití chemie MeSH
financování organizované MeSH
kolagen typu I diagnostické užití chemie MeSH
lidé MeSH
lokalizovaná sklerodermie diagnóza metabolismus MeSH
progrese nemoci MeSH
psoriáza diagnóza metabolismus MeSH
systémová sklerodermie diagnóza metabolismus MeSH
Check Tag
lidé MeSH

Článek

Thermoresponsive self-assembly of short elastin-like polypentapeptides and their poly(ethylene glycol) derivatives

Macromolecular bioscience. 2007 ; 7 (1) : 56-69.

ISSN 1616-5187
Medvik
Zdroj

Short polypeptides with four pentad repeats, (VPGVG)(4) and (VPAVG)(4), were synthesised by manual fluorenylmethoxycarbonyl/tert-butyl (Fmoc/t-Bu) solid phase peptide synthesis using a convergent approach. In the next step, the peptides were coupled via their N-terminus with activated semi-telechelic poly(ethylene glycol) O-(N-Fmoc-2-aminoethyl)-O'-(2-carboxyethyl)undeca(ethylene glycol) (Fmoc-PEG-COOH) to yield monodisperse Fmoc-PEG-peptide diblock copolymer. Both the presence of the terminal hydrophobic Fmoc group and the hydrophilic PEG chain in the copolymers were shown to play a crucial role in their self-associative behaviour, leading to reversible formation of supramolecular thermoresponsive assemblies. The peptides and their PEG derivatives were characterised by HPLC, NMR and MALDI-TOF MS. The associative behaviour of the peptides and their PEG derivatives was studied by dynamic light scattering, MAS NMR and phase contrast microscopy. [image: see text].