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A series of novel thermo-responsive hydrogels cross-linked by acid-degradable trehalose diacetals with VPTTs tailored to biologically useful temperatures were obtained by copolymerization of Nisopropylacrylamide with more hydrophilic comonomers: acrylamide, N-(2-hydroxyethyl)acrylamide or N,N-dimethylacrylamide. Due to the properties of the acetal bond, these hydrogels degraded via acid-catalyzed hydrolysis, in the course of which water-soluble terpolymers were formed and trehalose molecules with bioprotective properties were released. The incorporation of hydrophilic comonomers influenced the volume phase transition, swelling capacity, response rate to temperature change, mechanical properties, morphology and the degradation rate in acidic conditions. The release profile of the model drug, propranolol hydrochloride, was found to be dependent on the hydrogel composition, matrix form, and a medium pH. The preliminarily results of cytotoxicity assay suggest, that hydrogels and terpolymers are non-toxic towards L929 mouse fibroblasts.

Cancer therapy is often based on combination of conventional methods of cancer treatment with immunotherapy. Photodynamic therapy (PDT) is one of the immunomodulating methods used in oncology. We examined how PDT influences the secretory activity of colon cancer cells in vitro, especially the secretion of vascular endothelial growth factor (VEGF) in aerobic conditions.We used two cancer cell lines with different malignancy potentials: a metastatic SW620 line and a non-metastatic SW480 line. In the first stage of the experiment, we exposed each cell line to three different concentrations of photosensitizer's precursor: 5-aminolevulinic acid (ALA) and varying levels of light radiation, after which we assessed cell viability and apoptosis induction in these lines, using the MTT and LDH assays. Then, we determined the secretion of VEGF by these cells in aerobic conditions and under the ALA-PDT parameters at which cells presented the highest viability.Photodynamic treatment with ALA did not influence on VEGF secretion by the non-metastatic SW480 cells, but caused a decrease in VEGF secretion by the metastatic SW 620 cell line by 29% (p0.05). SW 620 cell line secreted more actively VEGF than the SW480 cells, both before and after photo dynamic therapy (p0.05).The outcome of this in vitro study presented a beneficial effect of ALA-PDT, resulting in a decrease of VEGF secretion in the more malignant SW620 cell lines. Further studies should be considered to confirm the clinical relevance of this finding.

Biochanin-A, a major dietary isoflavone in soy and red clover, possesses anticancer and chemopreventive properties. Induction of apoptosis by naturally occurring dietary agents is an important event for cancer chemoprevention. Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) triggers apoptosis selectively in cancer cells but not in normal cells. Soluble or expressed in immune cells, molecules TRAIL plays a significant role in surveillance and defense mechanisms against tumours. Prostate cancer is an ideal disease for nutritional prevention. The TRAIL-mediated apoptosis pathway in prostate cancer cells is an attractive target for chemopreventive activities of dietary agents. LNCaP and DU145 prostate cancer cells are resistant to TRAIL-induced apoptosis. We showed that biochanin-A markedly augmented TRAIL-induced cytotoxicity and apoptosis in both prostate cancer cell lines. Then, we investigated the mechanisms by which biochanin-A enhanced TRAIL-mediated apoptosis using the LNCaP cell line. The isoflavone sensitized the TRAIL-resistant LNCaP cells through the inhibition of transcription factor NF-κB(p65) activity, increased the expression of the death receptor TRAIL-R2 (DR5), and disrupted mitochondrial membrane potential (ΔΨm). Our study confirmed that biochanin-A overcame TRAIL-resistance by engaging both intrinsic and extrinsic apoptotic pathways and by regulating the NF-κB activity. The results suggested a potential role of biochanin-A in prostate cancer chemoprevention through the enhancement of TRAIL-mediated apoptosis.

Despite advances in surgical techniques and pharmacology, healing of injury-associated soft tissue defects is frequently complicated by infections, which often requires a secondary intervention. Cytokines are important mediators of healing. Application of autologous platelet-rich plasma enriched in growth factors and antimicrobial proteins, known also as platelet-leukocyte rich plasma (PLRP), represents a novel approach to the treatment of soft tissue and bone healing disturbances. This case is the first report on the application of PLRP in an infected high-energy soft tissue injury and shows that the volume and concentration of platelets and leukocytes is adequate to induce healing processes despite concurrent infection.

Background The pathogenesis of morbidity and mortality associated with intervention of the biliary system in patients with obstructive jaundice is unknown. Mechanical jaundice initiates the development of morphological changes in hepatocytes with concomitant disturbances in metabolism. These are followed by changes in enzyme activity in hepatocytes and peripheral blood. Material and methods Wistar rats were divided into three groups: group 1, sham-operated controls; group 2, rats with permanent jaundice; and group 3, rats with temporary mechanical jaundice. The animals were examined at 2 weeks (groups A), 4 weeks (groups B) and 6 weeks (groups C) after surgery. We explored the impact of induced mechanical jaundice on the activity of selected urea cycle enzymes (arginase [E.C.3.5.3.1] and ornithine transcarbamoylase (OTC) [E.C.2.1.3.3]). Results Mechanical jaundice was found to induce changes in hepatocytic metabolism, which in turn led to disturbances in the urea cycle and the process of transamination. After relief of the mechanical jaundice (recanalization of the common bile duct), the urea cycle activity in the liver was greatly increased despite the normalization of the basic biochemical indices. Conclusion The results of the experiment confirmed the hypothesis that long-term mechanical jaundice causes lasting disturbances in hepatocytic metabolism. We conclude that the rate of nitrogen metabolism is higher after recanalization of the bile duct.

Summary Background: Photodynamic therapy (PDT) has been recognized as a noninvasive therapeutic approach for the effective treatment of tumors. It has been shown in studies conducted on malignant cell lines and various animal tumor models, that the interaction of photosensitizing substances with light leads to the release of cytotoxic substances and stimulates the immune response. Purpose: The aim of our study was to analyze the immune system response in patients undergoing photodynamic therapy due to basal cell carcinoma (BCC). Methods: Patients with skin malignancies have been treated by 10% delta-aminolevulinic acid (ALA) (Medac GmbH, Wedel, Germany) topically and light from a diode laser. Blood samples were obtained from each patient twice in the same day: before and 4 h after photodynamic treatment procedure. In patients’ serum the concentration of transforming growth factor beta1 (TGF-β1) was determined. Additionally the study has been conducted on lymphocytes and granulocytes from peripheral blood. In cell culture supernatants the concentration of interleukin 1beta (IL-1β), interleukin 2 (IL-2), interleukin 6 (IL-6), tumor necrosis factor alpha (TNFα), the percentile composition of patients’ lymphocytes and the chemiluminescence of neutrophils have been measured. Results: We have observed a significant increase ( p = 0.015) in the intensity of the neutrophil chemiluminescence and significant diminution ( p = 0.006) of IL-1β concentration in supernatants. Similarly the serum level of TGF-β1 has been significantly decreased ( p Conclusion: It is very likely that human immune system activity is modified by topical ALA–PDT and may potentially contribute to its final outcome.

Propolis, a bee-hive product, has been used in folk medicine for centuries, and recently in modern medicine as an anti-inflammatory and immunomodulatory agent. These activities would be mainly due to phenolic compounds such as flavonoids, especially flavone derivatives. The present study examined the effect of ethanol extract of propolis (EEP) and selected flavone derivatives (chrysin, galangin, kaempferol and quercetin) on interleukin-1beta (IL-1beta) and inducible nitric oxide synthase (iNOS) gene expression in lipopolysaccharide (LPS)-induced J774A.1 macrophages. Treatment of cells with EEP significantly suppressed both IL-1beta mRNA (P