Thomas Riss

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A method previously used in this laboratory for entrapment of tumor cells in alginate beads has been extended to provide a slow release delivery system for growth factors with known in vivo angiogenic activity. Protein growth factors were entrapped in alginate beads in amounts sufficient to cause incorporation of 3H-thymidine by COMMA-D cells in vitro, and(More)
INTRODUCTION Exact data on the prevalence of hemorrhoids are rare. Therefore, we designed a study to investigate the prevalence of hemorrhoids and associated risk factors in an adult general population. METHODS Between 2008 and 2009, consecutive patients were included in a prospective study. They attended the Austrian national wide health care program for(More)
The effect of 17 beta-estradiol (E2) on growth of GH4C1 rat pituitary tumor cells was investigated under serum-free conditions and with medium containing charcoal-extracted serum. Serum-free TRM-1 medium was a 1:1 (vol/vol) mixture of F12-DME supplemented with 50 micrograms/ml gentamicin, 15 mM 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid, 10(More)
gamma-Glutamyltransferase (D-glutamyl transpeptidase, EC 2.3.2.2) activity has been shown to be located predominantly on the extracellular surface of the plasma membrane of lactating bovine mammary cells. Radioactive label from both oxidized ([14C]-gamma-glutamyl) and reduced ([35S]cysteinyl) glutathione was taken up and incorporated into acid-precipitable(More)
AIM There are few studies into the quality of life of patients with haemorrhoids. The aim of this study was to assess the quality of life of patients with haemorrhoids in an adult general population. METHOD Participants, who attended the Austrian nationwide healthcare programme for colorectal cancer screening at four medical institutions, were enrolled(More)
Rabbit polyclonal antibodies were raised against ovalbumin conjugates of purified bovine brain acidic fibroblast growth factor (aFGF) and a synthetic peptide containing the N alpha-terminal 1-24 amino acid sequence of bovine basic fibroblast growth factor (bFGF). These antibodies were used to specifically detect 1-ng quantities of aFGF and bFGF by using(More)
Lactating bovine mammary epithelial acini were isolated and primary culture on rat tail attached collagen gels are described. Acini rapidly attach to the gels and morphologically change little over days of culture under the culture conditions described herein. Cells release lactose, alpha-lactalbumin and alpha-s1 casein over a 6-day period. A new HPLC(More)
Growth of the estrogen-responsive MTW9/PL2 rat mammary tumor cells was demonstrated in serum-free defined medium (designated DDM-1) formulated with F12-DME (1:1 vol/vol) supplemented with 15 mM HEPES pH 7.4, insulin 10 micrograms/ml, transferrin 10 micrograms/ml, sodium selenite 10 ng/ml, triiodo-L-thyronine 0.3 nM, phosphoethanolamine 5 microM, epidermal(More)
Transferrin was identified as a major tissue-derived growth factor for MTW9/PL2 rat mammary tumor cells. Mitogenic activity was assayed by the ability to stimulate the increase in number of MTW9/PL2 cells over 4 d in Dulbecco's modified Eagle's medium containing only 15 mM HEPES, 2 mM glutamine, and 50 micrograms/ml gentamicin. This growth-promoting(More)
The growth of GH4C1, GH3, GH1, and GH3C15 rat pituitary tumor cell lines was studied in a serum-free medium (designated TRM-1) formulated with 1:1 (vol/vol) mixture of Ham's F12 nutrient mixture and Dulbecco's modified Eagle's medium (F12-DME) containing 15 mM 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES), 50 micrograms/ml gentamicin(More)