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Biomedical subjects

J Friedl

Publications and source records attributed to J Friedl.

At least 19 recordsLinked to original sources
PubMed2006

Remediation of contaminated agricultural soils near a former Pb/Zn smelter in Austria: batch, pot and field experiments.

Metal contaminated crops from contaminated soils are possible hazards for the food chain. The aim of this study was to find practical and cost-effective measures to reduce metal uptake in crops grown on metal contaminated soils near a former metal smelter in Austria. Metal-inefficient cultivars of crop plants commonly grown in the area were investigated in combination with in-situ soil amendments. A laboratory batch experiment using 15 potential amendments was used to select 5 amendments to treat contaminated soil in a pot study using two Barley (Hordeum vulgare L.) cultivars that differed in their ability to accumulate cadmium. Results from this experiment identified 3 of these amendments for use in a field trial. In the pot experiment a reduction in ammonium nitrate extractable Cd (<41%) and Pb (<49%) compared to the controls was measured, with a concurrent reduction of uptake into barley grain (Cd<62%, Pb<68%). In the field extractable fractions of Cd, Pb, and Zn were reduced by up to 96%, 99%, and 99%, respectively in amended soils.

Agriculture↗
PubMed2003

Dendritic cell-based vaccination in solid cancer.

PURPOSE: Dendritic cell (DC)-based immunotherapy is rapidly emerging as a viable tool in cancer treatment. This approach has been used mostly in patients in the presence of defined tumor antigens such as melanoma. In this study, cancer patients with advanced disease that lacks defined tumor antigens were vaccinated with tumor lysate-pulsed DCs. PATIENTS AND METHODS: Twenty patients (pancreatic, hepatocellular, cholangiocellular, and medullary thyroid carcinoma) with stage IV disease were enrolled in the study. In 3-week intervals, freshly isolated autologous CD14 magnetic bead-selected monocytes were cultured in granulocyte-macrophage colony-stimulating factor and interleukin-4 to obtain immature DCs. These cells were pulsed with autologous tumor lysate and matured with tumor necrosis factor alpha. Mature DCs were applied into a groin lymph node, under ultrasound guidance. Adjuvant interleukin-2 (20,000 U/kg) was given subcutaneously daily, for 12 days, after each vaccination. Toxicity, tumor marker profile, immune response, and clinical response were determined. RESULTS: Vaccination was well tolerated. No physical signs of autoimmunity were detected. DC vaccination induced delayed-type hypersensitivity reactivity in 18 patients. Tumor marker responses were observed in eight patients. In addition, in three patients the generation of interferon gamma-positive T cells was induced during the vaccination. Objective changes in measurable lesions or tumor markers were evident in seven of 20 assessed patients. None of the patients was found to meet the criteria for partial or complete responses. CONCLUSION: These data indicate that vaccination with autologous tumor-pulsed DCs generated from peripheral blood is safe and can induce tumor-specific cellular cytotoxicity. Clinical responses are achievable, even in patients with advanced disease.

Adult↗
PubMed2003

The early response of p53-dependent proteins during radiotherapy in human rectal carcinoma and in adjacent normal tissue.

The aim of this study was to investigate the activation of the p53 pathway and the induction of apoptosis during preoperative radiotherapy in normal human rectal tissue and in rectal carcinoma. Twelve patients with rectal cancer of the lower third were enrolled in this study. Tumor specimens and adjacent normal tissue were obtained before radiation, after the third radiation cycle and from the surgically removed rectum. All specimens were analyzed be means of immunohistochemistry for expression of p53 and its downstream target genes MDM2 and p21. In normal mucosal crypts, irradiation led to p53 accumulation and MDM2 induction in more than 70% of the cells. The accumulation of p53 in basal crypts was associated with high expression of p21. Apoptosis was also induced in crypts and occurred in 15% of the cells. Activation of the p53 pathway was not seen in the resting cells at the luminal border of the epithelium. In interstitial cells, p21 was highly upregulated, whereas p53 and MDM2 showed weak expression. The level of bcl-2 was not altered during radiotherapy in healthy tissue. In rectal carcinoma cells, p53 expression was unaltered by irradiation in 11 out of 12 tumors. The p53 non-functional tumors were characterized by a weak induction of MDM2 and p21 and by the lack of apoptosis in the presence of bcl-2. Our findings demonstrate that sequential immunohistochemical analysis is suitable to detect a deregulation of the p53 pathway in human rectal cancer cells during radiotherapy. Further investigations are necessary to elucidate its value as a prognostic marker and potential predictor of therapy responsiveness.

Aged↗
PubMed2002

Stimulation of autologous antitumor T-cell responses against medullary thyroid carcinoma using tumor lysate-pulsed dendritic cells.

Dendritic cells (DCs) have attracted wide interest because of their unique capacity to elicit primary and secondary antitumor responses. We have generated autologous tumor lysate-pulsed DCs from three patients with medullary thyroid carcinoma (MTC) and tested them for their ability to stimulate cytotoxic T-cell responses against autologous MTC tumor cells in vitro. The aim of our investigations was to evaluate the potential efficacy of DC-based immunotherapy in patients with MTC. DCs were generated from peripheral blood monocytes using GM-CSF and IL-4 (immature DCs) or GM-CSF, IL-4, and TNFalpha (mature DCs). Our results indicate that mature tumor lysate-pulsed DCs are able to elicit a human leukocyte antigen class I-restricted cytotoxic T-cell response against autologous MTC tumor cells, whereas immature tumor lysate-pulsed DCs do not stimulate significant antitumor activity. We feel that our data may be relevant for future clinical trials of active immunotherapy using tumor lysate-pulsed DCs in patients with MTC who have residual or distant disease after surgical treatment. The fact that mature DCs displayed a substantially higher capacity to stimulate autologous antitumor T-cell responses than immature DCs underlines the importance of a maturation step in immunotherapy protocols based on DCs.

Adult↗
PubMed2000

Successful treatment of a patient suffering from severe acute potassium dichromate poisoning with liver transplantation.

BACKGROUND: Oral ingestion of potassium dichromate produces a complex spectrum of complications. It has an extremely poor prognosis and usually leads to rapid death. METHODS: We report the case of a 16-year-old male patient who was admitted to hospital after oral ingestion of potassium dichromate with suicidal intention. RESULTS: The patient's condition deteriorated, and he became comatose within 5 days in spite of immediate attempts at detoxification. Because of irreversible liver failure, which occurred within 2 days after admission, and because of cerebral edema, the decision to perform a liver transplantation was made. On day 6 after admission, a compatible donor liver was transplanted. The course of liver transplantation and the patient's subsequent recovery were uneventful. CONCLUSION: The rationale for the delayed transplantation was to avoid damage of the new organ because of high serum chromium levels. Despite severe organ damage, the chromium content of the liver was increased. To the authors' knowledge, this is the first case report of acute toxic liver failure, caused by potassium dichromate poisoning, treated successfully by means of liver transplantation.

Acute Disease↗
PubMed2000

Tumor antigen pulsed dendritic cells enhance the cytolytic activity of tumor infiltrating lymphocytes in human hepatocellular cancer.

OBJECTIVE: Tumor infiltrating lymphocytes (TILs) stimulated with interleukin-2 (IL-2) ex vivo have been successfully used therapeutically in some cancer patients, but their potency in eliciting an effective anti-tumor response is variable. We have tried to augment killing activity of tumor infiltrating lymphocytes derived from hepato-cellular carcinoma (HCC) using autologous monocytes derived dendritic cells. METHODS: Tumor infiltrating lymphocytes (TILs) from 6 patient with hepatocellular carcinoma were isolated and the phenotype were further characterized. From the same patients, autologous dendritic cells were generated from CD14+ monocytes that were cultured for 6 days in the presence of granulocyte macrophage colony-stimulating factor (GM-CSF) and interleukin 4 (IL-4). Those professional antigen presenting cells were pulsed with whole autologous hepatoma tumor lysates (pDC). TILs were cocultured with pDC or unpulsed DC. To assess the cytotoxic potency of TILs, the ability to lyse the tumor cell targets K652, Daudi and an allogeneic HCC celline was determined in a standard cytotoxic assay. RESULTS: Tumor cells targets in vitro are poorly lysed by tumor infiltrating lymphocytes indicating T-cell hyporesponsiveness. In contrast, the killing activity of HCC derived TILs against Daudi (9.15% +/- 7.5) and allogeneic HCC tumor target (18.2% +/- 9.2) could be significantly augmented when stimulated with pDC (Daudi: 38% +/- 6.8 and allogeneic HCC: 55% +/- 10). The killing activity of TILs against K562 was unaffected by pDC. CONCLUSION: The low cytotoxic activity profile of HCC derived TILs in vitro can be increased by tumor lysate pulsed dendritic cells and may therefore be more effective in vivo when used for adoptive immunotherapy.

Antigens, Neoplasm↗
PubMed1999

Properties of Goethites Prepared under Acidic and Basic Conditions in the Presence of Silicate.

Goethite in natural environments usually grows in the presence of dissolved silicate. To study silicate-associated goethite with specific properties, goethite was synthesized in an Fe(III) system at RT under acidic (OH/Fe = 2; pH 1.6-1.8) and basic (OH/Fe = 4; pH 12-13) conditions at Si concentrations between 10(-5) and 1 M. The goethites were characterized by transmission (TEM) and scanning (SEM) microscopy, X-ray diffraction (XRD), Mössbauer spectroscopy (MS), and chemical analyses. Despite large differences in size and morphology, all goethite crystals were dominantly bound by 110 and 021 faces. Nanosized crystals (ca. 20 nm) were formed at low pH, where the influence of Si was weak. In the basic system, where Si retarded crystallization, much larger (tens to hundreds of nanometers) crystals were formed whose shape varied from acicular and multidomainic at low Si (10(-5) M) to monodomainic, blocky crystals at high (10(-2) M) Si concentration that had reduced growth along [001] in favor of [100] and [010]. The sizes and shapes of the crystals are discussed in terms of nuclei and growth unit concentrations in the system. Part of the retained Si could be released by phosphate and NaOH (surface-Si), and part was only liberated into HCl congruently with Fe (up to 46 and 17 g kg-1 for the acid and basic goethites, respectively). Neither XRD nor MS were able to prove structural Si-for-Fe substitution, probably because no tetrahedral positions are available to accommodate Si in the goethite structure. It is assumed that this nonsurface Si fraction is located between the crystal domains. Copyright 1999 Academic Press.

Journal Article↗
PubMed1999

From Fe(III) Ions to Ferrihydrite and then to Hematite.

The pathways from soluble Fe(III)-aquo ions to various solid polymeric Fe(III) oxides of increasing thermodynamic stability involve intermediate products which are still only partly known. This paper combines results from the literature with own new results from X-ray diffraction, Mössbauer spectroscopy, and electron microscopy. It is maintained that no intermediate phases were positively identified between mono-, di-, and trimers and a range of solid polynuclear phases. This indicates fast polymerisation as the OH/Fe ratio of the system increases. The immediate solid polynuclear phases are poorly crystalline Fe(III)-oxyhydroxy salts and a range of oxyhydroxides, called ferrihydrites in mineralogy, with varying crystallinity and magnetic ordering behavior. The rate of hydrolysis as affected by pH, rate of OH addition and temperature is of paramount importance for the nature of these polymeric phases. In the presence of free or surface-bound water, the transformation of ferrihydrite into the stable end product hematite (alpha-Fe2O3) proceeds by crystallization within the ferrihydrite aggregate and is enhanced as the pH approaches the zero point of charge as well as by Al in the system. This mechanism is different from that in nonaqueous systems. Copyright 1999 Academic Press.

Journal Article↗
PubMed1998

How do physicians define "light," "moderate," and "heavy" drinking?

Although widely used, terms associated with consumption of alcohol--such as "light," "moderate," and "heavy"--are unstandardized. Physicians conveying health messages using these terms therefore may impart confusing information to their patients or to other physicians. As an initial attempt to assess if informal standardization exists for these terms, the present study surveyed physicians for their definitions of such terms. Physicians operationally defined "light" drinking as 1.2 drinks/day, "moderate" drinking as 2.2 drinks/day, and "heavy" drinking as 3.5 drinks/day. Abusive drinking was defined as 5.4 drinks/day. There was considerable agreement for these operational definitions, indicating there is indeed an informal consensus among physicians as to what they mean by these terms. Gender and age did not influence these definitions, but self-reported drinking on the part of physicians was a factor. We also asked physicians for their opinions regarding the effects of "light," "moderate," and "heavy" drinking on health in general and specifically on health-related implications for pregnant women, and whether they felt their patients shared these beliefs.

Adolescent↗
PubMed1998

Haemophilus parainfluenzae liver abscess after successful liver transplantation.

Haemophilus parainfluenzae was isolated from a bile specimen and from an aspirate of a liver abscess in a 58-year-old liver-transplanted woman that was indicative of an invasion of the graft by an ascending route. Drug therapy, immunosuppression, rejection therapy, and Roux-en-Y choledochojejunostomy may have contributed to the septic course. Interdisciplinary cooperation was instrumental in diagnosis and successful management in this case.

Bile↗
PubMed1994

Effective stimulation of neutropoiesis with rh G-CSF in dyskeratosis congenita: a case report.

Dyskeratosis congenita (DC) is a rare congenital X-linked disorder. The major clinical manifestations are abnormal skin pigmentation, nail dystrophy, and leukoplakia of mucosal membranes. About 50% of the patients develop bone marrow failure, which is partly responsible for the poor prognosis. Recombinant human granulocyte-macrophage colony-stimulating factor (rhGM-CSF) has been administered to some neutropenic patients with DC, but only a moderate stimulation of neutropoiesis has been observed. We report on a patient with DC treated with recombinant human granulocyte-colony-stimulating factor (rhG-CSF). This treatment resulted in a substantial dose-dependent increase in the neutrophil count.

Adult↗
PubMed1994

Molecular mechanism of the t(14;18)--a model for lymphoid-specific chromosomal translocations.

The chromosomal translocation t(14;18) occurs during early B-cell development and juxtaposes the immunoglobulin heavy chain locus (IgH) with the bcl-2 oncogene. Several factors contribute to the translocation mechanism: (1) The rearrangement of the chromosome 14 DH and JH translocation partners has typical features of V(D)J-recombinase-mediated joining with N-segment addition. (2) The bcl-2 major (mbr) and minor (mcr) breakpoint regions as well as their IgH reciprocal counterparts contain recombinatorial sequences related to chi or the minisatellite-core which bind at least one common DNA-binding protein (bp45). Similar elements are found at the breakpoints of other lymphoid-specific translocations like the t(11;14), t(2;8) or the t(4;11). (3) Structural analysis of the bcl-2 mbr indicates that this region may adopt alternative DNA-configurations which can promote recombination and is cleaved by an endogenous nuclease present in early B-cells. The present data suggest that V(D)J-recombinase as well as chi/minisatellite-core mediated recombination contribute to the mechanism and make the t(14;18) a model system for lymphoid-specific reciprocal translocations.

Base Sequence↗
PubMed1994

AML1/ETO fusion mRNA can be detected in remission blood samples of all patients with t(8;21) acute myeloid leukemia after chemotherapy or autologous bone marrow transplantation.

The chromosomal translocation t(8;21)(q22;q22) in acute myeloid leukemia (AML) can be detected by a reverse transcription-polymerase chain reaction (RT-PCR) for the chimeric AML1/ETO transcript. We have evaluated the clinical relevance of this method for monitoring and detection of minimal residual disease (MRD) in seven patients who reached a complete hematological remission (CHR) after chemotherapy or autologous bone marrow transplantation (ABMT). Peripheral blood (PB) samples of five patients in first continuous complete remission (CCR) were still PCR-positive at a frequency of 1 in 10(5) cells after 7, 8, 8, 10 or 66 months. Chemotherapy led to a reduction from first- to second-step PCR-positivity in three serially monitored patients. AML1/ETO mRNA was also detected in the PB of two patients in CCR, 10 or 12 months after ABMT. PB and bone marrow (BM) showed identical results in all samples tested simultaneously. AML1/ETO fusion transcripts were neither found in the PB and BM of a healthy individual, nor in the PB of a patient after allogeneic BMT for cytogenetically proven t(8;21)-leukemia. Our results indicate the presence of cells carrying the AML1/ETO rearrangement in the PB and BM of all patients in CHR after chemotherapy or ABMT for t(8;21)-positive AML. While this finding raises interesting questions about the biology of acute leukemia, it limits the value of the AML/ETO RT-PCR for the prediction of impending relapse.

Adult↗
PubMed1994

[Therapy of Hodgkin's disease].

Hodgkin's disease has become the prototype of a curable neoplastic condition. In localized disease (stages I and II) cure can be achieved with radiotherapy alone unless B-symptoms are present. In case of B-symptoms or generalized disease (stages III and IV) the administration of polychemotherapy is mandatory. In advanced stages combinations of the non-cross-resistant regimens MOPP and ABVD seem to be the most effective. In patients relapsing from the MOPP/ABVD or MOPP/ABV regimen salvage chemotherapy offers a chance of remission but not cure. Such patients, in particular those with a short first remission, are candidates for autologous stem cell transplantation which can still induce durable remissions in a subset of patients. Considering the long term complications such as infertility and the development of secondary neoplasms one has to carefully balance the benefits against the potential risks of the initial treatment approach.

Combined Modality Therapy↗
PubMed1994

Guanine-rich (GGNNGG) elements at chromosomal breakpoints interact with a loop-forming, single-stranded DNA-binding protein.

Proto-oncogene-activation is frequently preceded by chromosomal translocations. Several models suggest that DNA single-strands and loops may serve as intermediates in the process of illegitimate recombination. Guanine-rich, repetitive elements are preferred sites of chromosomal exchange and can undergo conformational changes which result in the generation of single-stranded DNA. Here we describe a single-stranded DNA-binding protein which binds specifically to guanine-rich elements at the breakpoints of human reciprocal translocations, including the t(14;18), t(2;8), t(9;22), t(15;17) and t(4;11) in leukemia and lymphoma. The primitive binding consensus consists of two guanine-residues on either side separated by a spacer of at least two nucleotides (GGN-NGG). Binding activity is unaltered by a spacer length of up to 46 nucleotides. These data suggest that the protein has the unique ability to form or stabilize DNA-loops and may thus play a general role in recombination.

Base Sequence↗
PubMed1982

Explanatory models of black lung: understanding the health-related behavior of Appalachian coal miners.

Many retired coal miners who are eligible for care in a black lung treatment center at little or no cost to themselves do not enter into available programs or discontinue soon after beginning therapy. Reasons for this behavior are related to the prevalent beliefs among Appalachians concerning the course of black lung and the appropriate treatment for it. The miners' health beliefs are clearly at odds with those of the health care providers who work in the centers. Using the concept of explanatory model, popular and professional health cultures are analyzed, focusing on course of disease, sick role, appropriate treatment, and expected outcome. Differences in explanatory models are discussed with regard to implications for the organization and delivery of care to retired coal miners with black lung.

Appalachian Region↗