Search PubMed⌕ Search

Biomedical subjects

D Lange

Publications and source records attributed to D Lange.

At least 55 records · Page 3Linked to original sources
PubMed1997

Effect of a cola beverage on the bioavailability of itraconazole in the presence of H2 blockers.

Thirty-three healthy individuals participated in an open-label, randomized, three-way crossover study designed to compared the bioavailability of a single 200-mg oral dose of itraconazole when administered alone or after treatment with ranitidine, both with and without coadministration of a cola beverage. Each treatment phase was separated by a 2-week washout period. Participants pretreated with ranitidine were required to have a gastric pH of at least 6.0 before receiving itraconazole. An analysis of the area under the curve (AUC) and peak plasma concentration (Cmax) data indicated that the bioavailability of itraconazole was significantly reduced when the gastric pH was increased by pretreatment with ranitidine but showed that this effect was counteracted by the coadministration of an acidic solution (e.g., a cola beverage) that transiently reduced the gastric pH. These findings suggest that the coadministration of an acidic beverage with itraconazole may be an effective approach in improving the bioavailability of itraconazole in patients who are hypochlorhydric or who are taking gastric acid suppressants.

Adult↗
PubMed1997

Probing the structure of the ligand binding cavity of lipocalins by fluorescence spectroscopy.

The lipocalin superfamily constitutes a phylogenetically conserved group of more than 40 proteins that function in the binding and transport of a variety of physiologically important ligands. Members of this family subserve diverse functions as carriers of retinoids (retinol binding protein), odorants (odorant binding proteins), chromophores (insecticyanin, INS), pheromones (aphrodisin) and sterols (apolipoprotein D, apoD). Despite the pivotal importance of the ligand binding function of these proteins, a suitable approach for characterizing the molecular determinants of such binding has not been available. In studies using three homogeneously purified lipocalins INS, beta-lactoglobulin (BLG) and human apoD, we find that the fluorescence reporter BIS (1,1'-bi(4-anilino) naphthalene-5,5'-disulfonic acid) is an ideal candidate for use in rapid kinetic experiments and in fluorescence resonance energy transfer (FRET). These methods require only small amounts of reagents and yield molecular coordinates of the ligand binding cavity of lipocalins in solution that are in remarkably close agreement to those obtained from crystallographic work with solids. Extremely fast ligand binding dynamics is indicated.

Animals↗
PubMed1997

[The case of myoepithelioma of the parotid gland].

Myoepithelioma of the parotid gland occurs relatively rarely. In the literature was described only 33 cases of this tumors. It's growth's slow and distension. Basing upon the case of 48-year old woman, the authors discuss the difficulties of diagnostic, treatment and the course of the disease.

Female↗
PubMed1996

Blood superoxide dismutase, catalase and glutathione peroxidase activities in familial and sporadic amyotrophic lateral sclerosis.

Recent studies have implicated free radicals in the pathogenesis of amyotrophic lateral sclerosis (ALS), a fatal, paralytic disorder of motor neurons. Herein we report on measurements of erythrocyte activity of the three main free radical scavenging enzymes: copper/zinc superoxide dismutase (Cu/Zn-SOD), catalase, and glutathione peroxidase. We studied 31 patients with sporadic ALS, 18 with familial ALS, and 24 controls, Mean Cu/Zn-SOD activity was reduced in eight familial ALS patients with mutations of Cu/Zn-SOD but was normal in patients with both familial ALS without identified Cu/Zn-SOD mutations and sporadic ALS. Glutathione peroxidase activity was significantly reduced only in sporadic ALS patients treated with insulin-like growth factor I (100 micrograms/kg). Catalase activity was normal in sporadic and familial ALS. Neither glutathione peroxidase nor catalase activities correlated significantly with duration of symptoms or age at onset. Vitamin E, vitamin C, and beta-carotene did not affect any of the three enzyme activities. These observations indicate that disturbances of catalase and glutathione peroxidase function are not likely to be central factors in the pathogenesis of ALS.

Age of Onset↗
PubMed1996

[Methodical evaluation of immunoluminometric determination of thyroid peroxidase in serum].

With the identification of thyroid peroxidase (TPO) as the specific autoantigen in autoimmune diseases of the thyroid, the development of a commercial assay for detection of TPO in human serum became possible. The diagnostic value of this TPO assay was evaluated in 194 patients with various thyroidal diseases. The assay appeared to be easily affected by specific and/or unspecific interferences such as TPO-auto-antibodies in the patient's blood samples. To analyze these effectors every sample was checked in a parallel recovery test. In most of the cases with elevated anti-TPO levels an exact determination of TPO could not be estimated correctly. Whenever a correct measurement of TPO was possible, to none of the different examined groups of thyroid diseases a correlation of TPO-levels could be demonstrated. Moreover, the value of TPO determination as a tool in the follow-up of differentiated thyroid carcinoma was not provable. For the time being our studies do not suggest TPO measurements being helpful in thyroidal diagnosis.

Autoimmune Diseases↗
PubMed1996

Sequential combination of radio-chemotherapy (5-fluorouracil, cis-platinum and irradiation) in the management of locally advanced head and neck cancers.

Thirty-seven previously untreated patients with advanced, inoperable head and neck were treated with a sequential courses combining hypofractionated irradiation with chemotherapy (5-fluorouracil and cis-platinum). Each course was repeated every 4 weeks. Tumor response was evaluated and for 15 patients (41%) with a partial or complete regression after 3 radio-chemotherapy courses conventional radiotherapy was added. Eleven percent of all patients were in complete remission at the end of a treatment. This tumor response rate and the 50% rate of pain subside after first course for symptomatic patients contributed for a good palliative effect in the present study. However, the median survival of 7.2 months was considered unsatisfactory.

Adult↗
PubMed1996

Expression of transforming growth factor beta isoforms and their receptors during hair growth phases in mice.

Transforming growth factor beta (TGF-beta) is a family of potent growth inhibitor proteins, often produced as a precursor and often secreted in a complex with the latent TGF-beta binding protein (LTBP). We investigated the expression of TGF-beta 1, -beta 2, -beta 3, LTBP, TGF-beta receptor proteins type I and type II (T beta R-I and -II) during induced hair growth in C57 BL-6 mice. We here demonstrated that TGF betas and T beta R-I are expressed in hair follicle epithelium and have found a positive reactivity for LTBP and T beta R-I in ++sebocytes. Dermal tissue was weakly stained for LTBP and TGF-beta 3. In early anagen the inner hair root sheath epithelium expressed TGF-beta 1, whereas outer hair root was positive for T beta R-I during anagen/catagen switch. T beta R-II was found in sebaceous glands without significant variations during the hair cycle. We may conclude that in follicle epithelium TGF-beta 1 is not produced in a complex together with LTBP. On the other hand, it is possible that other types of LTBP, like LTBP-2 and LTBP-3, are present, which are not detected by the antibody we used. Furthermore, a very rapid secretion of LTBP from producing cells may prevent immunohistochemical detection. TGF-beta 1 released by inner hair root sheath may regulate outer root sheath growth. A bidirectional interaction of sebocytes and hair follicle epithelium in the TGF-beta/LTBP seems possible. Sebocytes can be considered to be a target for TGFs since they express both T beta R++-I and -II. The general properties of TGF-beta as a growth inhibitor of epithelial cells may suggest a possible involvement in either the abrogation of extensive growth at the end of anagen or the initiation of catagen for the follicle epithelium as well as growth control for sebaceous glands.

Animals↗
PubMed1995

[Non Hodgkin's lymphoma of the breast].

There are described two cases of Non Hodgkin's lymphoma of the breast. The authors pointed to difficulties of histological diagnosis and paid attention that this extranodal localisation may be the first manifestation of malignant lymphoma in its subclinical phase.

Breast Neoplasms↗
PubMed1994

[Morbidity of radical prostatectomy for localized cancer of the prostate].

The author reports the morbidity of 173 personal radical prostatectomy operations performed by the same surgeon between 1st June 1985 and 31st December 1992. The early morbidity was negligible. The late morbidity was marked by a single case of complete incontinence (0.5%). Sexual function deteriorated in proportion to the increasing quality of operative haemostasis.

Aged↗
PubMed1993

Importance of tumor size and repopulation for radiocurability of skin cancer.

Data on 946 skin cancers treated by radiation were used to estimate the importance of repopulation. Six different treatment regimes were used from a single dose to 74 Gy given in 47 fractions. High local control of the small skin cancers (L 1 cm) was independent of dose fractionation. For large tumors, only 74 Gy in 47 fractions was the optimal treatment. Time factor analysis showed a steep increase in the NTD50 values between day 28 and 65 of treatment. This implies that tumor clonogen repopulation starts around 4 weeks of treatment. The present results showed a three-component dose response curve instead of the two-component curves which were found for head and neck and bladder cancer.

Dose-Response Relationship, Radiation↗
PubMed1990

[Elements of the early diagnosis and staging of prostatic cancer. Functional results of radical surgery. Apropos of 50 complete prostatectomies].

The authors report a series of 50 radical prostatectomies and analyse and discuss the elements of: early diagnosis of adenocarcinoma: 63% of patients did not have a strictly normal digital rectal examination, 70% had abnormal ultrasonography, 73% has a PSA assay greater than 10. Suspicious signs were absent in 17% of cases, but present in 83% of cases (one sign), 63% of cases (two signs) and 40% of cases (three signs). Ultrasound guided biopsy of suspicious zones (on rectal examination or on ultrasonography) and in adjacent zones by dividing the prostate into quadrants has an increasing diagnostic yield (77% of the last thirty cases, 100% of the last fifteen cases). Staging frequently underestimates the exact volume of the tumour and the state of the prostatic capsule. MRI using a high power magnetic field apparatus seems to improve the accuracy of preoperative staging. Operative results were excellent in terms of mortality (nil), morbidity (6% of cases) and functional results for continence (recovered within one month) and sexual activity (satisfactory in 73% of cases) when Walsh's technique was able to be applied.

Adenocarcinoma↗