Entity

Time filter

Source Type


Lodowska J.,Medical University of Silesia, Katowice | Gruchlik A.,Medical University of Silesia, Katowice | Wolny D.,Medical University of Silesia, Katowice | Wawszczyk J.,Medical University of Silesia, Katowice | And 3 more authors.
Acta Poloniae Pharmaceutica - Drug Research | Year: 2015

Sulfasalazine (SAS) and its therapeutically active derivative - 5-aminosalicylic acid (5-ASA) are used in the treatment of inflammatory bowel disease. 5-ASA mechanism of action on the one hand, involves the inhibition of the cyclooxygenase and lipoxygenase activity, and thus decrease of synthesis of prostaglandins, leukotrienes and free radicals, on the other hand, the suppression of the immune response in the intestinal mucosa. Myofibroblasts, which are located just below the basement membrane, are important element of the mucosa. Due to its secretory activity they may interact with other cells, including epithelial cells. Examining SAS and 5-ASA cytotoxic properties on human normal, colon subepithelial myofibroblasts (CSEMF) it was found that the first of these compounds in a concentration of 1 mM significantly reduced the number of these cells as compared to the control, while the latter exhibited an action at the 5-fold higher concentration (5 mM). Moreover, SAS concentration greater than 0.25 mM reduced IL-8 secretion by CSEMF, and 5-ASA had no effect in the tested range of concentrations, i.e., up to 7.5 mM. Source


Sosinka A.,University of Silesia | Rost-Roszkowska M.M.,University of Silesia | Rost-Roszkowska M.M.,Silesian Medical College in Katowice | Vilimova J.,Charles University | And 7 more authors.
Arthropod Structure and Development | Year: 2014

The midgut epithelia of the millipedes Polyxenus lagurus, Archispirostreptus gigas and Julus scandinavius were analyzed under light and transmission electron microscopies. In order to detect the proliferation of regenerative cells, labeling with BrdU and antibodies against phosphohistone H3 were employed. A tube-shaped midgut of three millipedes examined spreads along the entire length of the middle region of the body. The epithelium is composed of digestive, secretory and regenerative cells. The digestive cells are responsible for the accumulation of metals and the reserve material as well as the synthesis of substances, which are then secreted into the midgut lumen. The secretions are of three types - merocrine, apocrine and microapocrine. The oval or pear-like shaped secretory cells do not come into contact with the midgut lumen and represent the closed type of secretory cells. They possess many electron-dense granules (J. scandinav i us) or electron-dense granules and electron-lucent vesicles (A. gigas, P. lagurus), which are accompanied by cisterns of the rough endoplasmic reticulum. The regenerative cells are distributed individually among the basal regions of the digestive cells. The proliferation and differentiation of regenerative cells into the digestive cells occurred in J. scandinavius and A. gigas, while these processes were not observed in P. lagurus. As a result of the mitotic division of regenerative cells, one of the newly formed cells fulfills the role of a regenerative cell, while the second one differentiates into a digestive cell. We concluded that regenerative cells play the role of unipotent midgut stem cells. © 2014 Elsevier Ltd. All rights reserved. Source


Rzepecka-Stojko A.,University of Silesia | Stojko J.,University of Silesia | Kurek-Gorecka A.,Silesian Medical College in Katowice | Gorecki M.,University of Silesia | And 3 more authors.
Journal of Apicultural Research | Year: 2016

Our study determined the effect of extraction method of bee pollen on the optimal antioxidant activity of the extract obtained. We determined the content of polyphenols and flavonoids as well as the antioxidant activity of the ethanol extract of pollen loads (EEP), the pepsin extract of pollen loads (PEP), and the pepsin-digested extract of pollen loads (EEPP). The total content of polyphenols was measured using Follin–Ciocalteau reagent. The flavonoid content was measured using aluminum chloride. Phenolic acids and flavonoids were identified and quantified by HPLC. The antioxidant activity was measured by 2,2-diphenyl-picrylhydrazyl radical scavenging activity assays and Trolox equivalents antioxidant capacity. Antioxidant activities were the highest in EEPP and associated with the total content of phenolic and flavonoid compounds. This study indicated that pepsin digestion conducted before ethanol extraction allowed us to obtain more bioactive compounds, as well as the highest antioxidant activity of extract. © 2016 International Bee Research Association Source


Morus M.,Silesian Medical College in Katowice | Baran M.,Silesian Medical College in Katowice | Rost-Roszkowska M.,Silesian Medical College in Katowice | Rost-Roszkowska M.,University of Silesia | And 2 more authors.
Acta Poloniae Pharmaceutica - Drug Research | Year: 2014

The stem cells thanks to their ability of unlimited division number or transformation into different cell types creating organs, are responsible for regeneration processes. Depending on the organism in which the stem cells exists, they divide to the plant or animal ones. The later group includes the stem cells existing in both embryo's and adult human's organs. It includes, among others, epidermal stem cells, located in the hair follicle relieves and also in its basal layers, and responsible for permanent regeneration of the epidermis. Temporary science looks for method suitable for stimulation of the epidermis stem cells, amongst the other by delivery of e.g., growth factors for proliferation that decrease with the age. One of the methods is the use of the plant cell culture technology, including a number of methods that should ensure growth of plant cells, issues or organs in the environment with the microorganism-free medium. It uses abilities of the different plant cells to dedifferentiation into stem cells and coming back to the pluripotent status. The extracts obtained this way from the plant stem cells are currently used for production of both common or professional care cosmetics. This work describes exactly impact of the plant stem cell extract, coming from one type of the common apple tree (Uttwiler Spátlauber) to human skin as one of the first plant sorts, which are used in cosmetology and esthetic dermatology. © 2014, Polish Pharmaceutical Society. All rights reserved. Source


Rost-Roszkowska M.M.,University of Silesia | Rost-Roszkowska M.M.,Silesian Medical College in Katowice | Chajec L.,University of Silesia | Chajec L.,Silesian Medical College in Katowice | And 2 more authors.
Protoplasma | Year: 2015

Three types of cells have been distinguished in the midgut epithelium of two centipedes, Lithobius forficatus and Scolopendra cingulata: digestive, secretory, and regenerative cells. According to the results of our previous studies, we decided to analyze the relationship between apoptosis and necrosis in their midgut epithelium and circadian rhythms. Ultrastructural analysis showed that these processes proceed in a continuous manner that is independent of the circadian rhythm in L. forficatus, while in S. cingulata necrosis is activated at midnight. Additionally, the description of apoptosis and necrosis showed no differences between males and females of both species analyzed. At the beginning of apoptosis, the cell cytoplasm becomes electron-dense, apparently in response to shrinkage of the cell. Organelles such as the mitochondria, cisterns of endoplasmic reticulum transform and degenerate. Nuclei gradually assume lobular shapes before the apoptotic cell is discharged into the midgut lumen. During necrosis, however, the cytoplasm of the cell becomes electron-lucent, and the number of organelles decreases. While the digestive cells of about 10 % of L. forficatus contain rickettsia-like pathogens, the corresponding cells in S. cingulata are free of rickettsia. As a result, we can state that apoptosis in L. forficatus is presumably responsible for protecting the organism against infections, while in S. cingulata apoptosis is not associated with the elimination of pathogens. Necrosis is attributed to mechanical damage, and the activation of this process coincides with proliferation of the midgut regenerative cells at midnight in S. cingulata. © 2015 Springer-Verlag Wien Source

Discover hidden collaborations