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    Wyświetlanie 1-5 z 5
    Tytuł:
    Cyclic enkephalin-deltorphin hybrids containing a carbonyl bridge: structure and opioid activity
    Autorzy:
    Ciszewska, Małgorzata
    Ruszczyńska, Katarzyna
    Oleszczuk, Marta
    Chung, Nga
    Witkowska, Ewa
    Schiller, Peter
    Wójcik, Jacek
    Izdebski, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/1039922.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    cyclic opioid peptides
    conformation
    NMR
    N-(ureidoethyl)amides
    side-chain to side-chain cyclization
    structure-activity relationship
    Opis:
    Six hybrid N-ureidoethylamides of octapeptides in which an N-terminal cyclic structure related to enkephalin was elongated by a C-terminal fragment of deltorphin were synthesized on MBHA resin. The synthetic procedure involved deprotection of Boc groups with HCl/dioxane and cleavage of the peptide resin with 45 % TFA in DCM. d-Lys and d-Orn were incorporated in position 2, and Lys, Orn, Dab, or Dap in position 5. The side chains of the dibasic amino function were protected with the Fmoc group. This protection was removed by treatment with 55 % piperidine in DMF, and cyclization was achieved by treatment with bis-(4-nitrophenyl)carbonate. Using various combinations of dibasic amino acids, peptides containing a 17-, 18-, 19- or 20-membered ring structure were obtained. The peptides were tested in the guinea-pig ileum (GPI) and mouse vas deferens (MVD) assays. Diverse opioid activities were observed, depending on the size of the ring. Extension of the enkephalin sequence at the C-terminus by a deltorphin fragment resulted in a change of receptor selectivity in favor of the δ receptor. The conformational propensities of selected peptides were determined using the EDMC method in conjunction with data derived from NMR experiments carried out in water. This approach allowed proper examination of the dynamical behavior of these small peptides. The results were compared with those obtained earlier with corresponding N-(ureidoethyl)pentapeptide amides.
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 2; 225-230
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light conditions alter accumulation of long chain polyprenols in leaves of trees and shrubs throughout the vegetation season.
    Autorzy:
    Bajda, Agnieszka
    Chojnacki, Tadeusz
    Hertel, Józefina
    Swiezewska, Ewa
    Wójcik, Jacek
    Kaczkowska, Alicja
    Marczewski, Andrzej
    Bojarczuk, Tomasz
    Karolewski, Piotr
    Oleksyn, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1041482.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    plant polyprenols
    SLA
    Opis:
    In many plants belonging to angiosperms and gymnosperms the accumulation in leaves of long chain polyprenols and polyprenyl esters during growth in natural habitats depends on the light intensity. The amount of polyprenols in leaves is also positively correlated with the thickness of the leaf blade (SLA, specific leaf area). The polyprenol content of leaves shows seasonal changes with a maximum in autumn and a minimum in early summer with the difference between poorly and well illuminated plants persisting throughout the vegetation season.
    Źródło:
    Acta Biochimica Polonica; 2005, 52, 1; 233-241
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of biochemical factors in the pathogenesis of keratoconus
    Autorzy:
    Wojcik, Katarzyna
    Blasiak, Janusz
    Szaflik, Jerzy
    Szaflik, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1039330.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    keratoconus
    cornea
    collagen
    proteinases
    proinflammatory markers
    antioxidants
    Opis:
    Keratoconus (KC) is a corneal disease associated with structural abnormalities in the corneal epithelium, Bowman's layer and stroma and altered concentration of tear components. KC corneas show a different pattern of collagen lamellae than their normal counterparts. Also, a reduction of several collagen types in KC epithelium and stroma was observed. Altered expression and/or activity of lysyl oxidase, a critical enzyme of the biogenesis of connective tissue detected in KC corneas, may weaken covalent bonds between collagen and elastin fibrils, what may lead to biomechanical deterioration of the cornea. Increased activity of matrix metalloproteinases observed in KC may induce the degradation of the extracellular matrix causing damage to the cornea. Oxidative and nitrative stress play an important role in KC pathogenesis and KC corneas are characterized by the disturbed lipid peroxidation and nitric oxide pathways. Malfunctioning of these pathways may lead to accumulation of their toxic by-products inducing several detrimental effects, along with apoptosis of the corneal cells, which may result from the loss of β-actin or increased levels of cytokines, including interleukin-1 and -6. Change in the expression of genes associated with wound healing, including the nerve growth factor and the visual system homeobox 1, may contribute to increased susceptibility of KC corneas to injury. Consequently, biochemical changes may play an important role in KC pathophysiology and, therefore, can be considered in prevention, diagnosis, prognosis and in the therapy of this disease as well.
    Źródło:
    Acta Biochimica Polonica; 2014, 61, 1; 55-62
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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