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Biomedical subjects

U Hansen

Publications and source records attributed to U Hansen.

At least 73 records · Page 4Linked to original sources
PubMed1989

Elephantiasis-like cutaneous metastases from signet-ring cell carcinoma of the stomach.

We report the clinical features and course of a 66-year-old patient with gastric carcinoma, in whom multiple cutaneous metastases occurred one year after he underwent subtotal gastrectomy. Although internal malignancies rarely metastasize to the skin, when they do this may have profound diagnostic, therapeutic, and prognostic significance. Cutaneous metastases are usually synonymous with a rapidly progressive disease and a poor prognosis. This case, in which cutaneous metastases were found in the lower limbs, is notable since usually less than 4 percent of cutaneous metastatic lesions are found in this region. Moreover, the case seems unique because of the predominating dermiotrophic metastases, with only minor internal involvement.

Adenocarcinoma, Mucinous↗
PubMed1988

Age, fiber type composition and in vitro contracture responses in human malignant hyperthermia.

Muscle fiber typing and in vitro contracture tests were performed in 59 patients investigated for susceptibility to malignant hyperthermia (MH). Eighteen patients were found to be susceptible to MH. There was no difference in age or fiber type distribution between MH susceptible and non-susceptible patients. No correlation was found between age and fiber type distribution. Separate analyses for each diagnostic group revealed no relationship between age or fiber type distribution and response to halothane or caffeine. When all caffeine results were pooled, however, there was a significant effect of age on the caffeine specific concentration (the concentration eliciting a contracture of 1 g), but not on the caffeine threshold concentration (the minimal concentration eliciting an increase in tension). It is concluded that age and fiber type distribution have no influence on MH diagnosis, if the protocol of the European MH Group for evaluation of susceptibility to MH is followed.

Adolescent↗
PubMed1988

Bladder tumor staging by transurethral ultrasonic scanning.

To determine tumor stage, 115 bladder cancer patients with cystoscopic suspicion of invasion underwent transurethral ultrasonic scanning. Seventeen patients who had received radiotherapy were excluded because it proved impossible to differentiate between tumor and irradiation sequelae. Of the remaining 98 examinations, 4 (4.1%) were inconclusive, 73 tumors (74.5%) were correctly staged, 16 tumors (16.3%) were overstaged and 5 tumors (5.1%) understaged. Transurethral ultrasound is regarded a useful supplement to cytoscopy and biopsy in staging of bladder tumors suspected of invasion.

Biopsy↗
PubMed1987

lac repressor can regulate expression from a hybrid SV40 early promoter containing a lac operator in animal cells.

The E. coli lac operator and repressor were adapted for function in mammalian cells. Plasmids containing an SV40 early region (pSVlacO) or a chloramphenicol acetyl transferase gene (pSVlacOCAT) linked to a hybrid SV40 early promoter bearing a lac operator were tested for function. Identical plasmids lacking an operator (pX-8 and pX-8CAT) were controls. In vitro, early transcription from pSVlacO, but not from pX-8, was inhibited by lac repressor, and repression was overcome by IPTG. Repression of large T synthesis or CAT activity occurred in vivo only when the respective operator-containing plasmid was cotransfected with a plasmid encoding lac repressor, or when the recipient cells stably synthesized lac repressor. IPTG substantially relieved repression in both cases. CAT enzyme repression was paralleled by a decrease in CAT mRNA abundance. Thus regulatory elements of the lac operon function physiologically in mammalian cells.

Acetyltransferases↗
PubMed1987

Specific stimulation of simian virus 40 late transcription in vitro by a cellular factor binding the simian virus 40 21-base-pair repeat promoter element.

We have identified a cellular transcription factor from uninfected HeLa cells that stimulates the simian virus 40 (SV40) late mode of transcription and specifically binds the SV40 21-base-pair repeat promoter element. In particular, the late SV40 transcription factor (LSF) stimulates transcription at initiation sites L325 and L264 of the SV40 late promoter, which are the major transcription sites utilized after DNA replication during the SV40 lytic cycle. In addition, LSF appears to stimulate transcription to a lesser extent from the late-early initiation site of the early promoter. LSF binds specifically to the 21-base-pair repeats of the SV40 promoters, forming specific protein-DNA complexes, which migrate more rapidly through nondenaturing polyacrylamide gels than that formed by the previously identified transcription factor Sp1. Thus, LSF is distinguishable from Sp1 in both its transcriptional and DNA-binding properties. These findings suggest a potential role of LSF in the early to late transcriptional switch during a SV40 lytic infection.

Binding Sites↗
PubMed1987

cis- and trans-acting sequences required for expression of simian virus 40 genes in mouse oocytes.

To determine the requirements for gene expression in mammalian germ cells, circular double-stranded simian virus 40 (SV40) DNA molecules containing deletions in sequences controlling transcription and replication were injected into the nucleus of mouse oocytes. Expression of large (T-Ag) and small (t-Ag) tumor antigens ("early gene products") required at least three GGGCGG boxes, but did not require either the origin of viral DNA replication (ori) or a TATA box. Expression of capsid antigen VP1 ("late gene products") required at least three GGGCGG boxes, sequences between nucleotides 197 and 273 in the 72-bp repeat region, and transactivation by T-Ag. These results are consistent with the requirements for expression of the same genes in differentiated mammalian cells. Surprisingly, however, the 72-bp repeats ("enhancer elements") that are required for expression of T-Ag and t-Ag genes in differentiated cells were not required in mouse oocytes. Similarly, expression of both the early and late genes was unaffected in mouse oocytes by the absence of either DNA replication or an intact ori sequence, components required for maximum expression of late genes in differentiated cells. Thus, mammalian oocytes effectively utilize promoters that are fully active in mammalian differentiated cells only when associated with either enhancer elements or DNA replication. Furthermore, requirements for expression of SV40 genes in mouse oocytes are distinctly different from those reported for Xenopus oocytes. This suggests that caution should be exercised when extrapolating conclusions drawn from experiments with amphibian germ cells to mammalian germ cells.

Animals↗
PubMed1987

Benign cystic lesions of the tunica albuginea.

We report 4 cases of benign testicular cysts arising from the tunica albuginea. A review of the literature yielded only 15 similar cases. The cysts appear in the anterior and lateral aspects of the testis, show ample connection to the albuginea and are lined by a cuboidal epithelium. Clinically, these cysts may be manifested as a tumour or painful swelling or are discovered incidentally. The possibility of a conservative surgical approach is discussed.

Adult↗
PubMed1986

Hypertension in renal allograft recipients may be conveyed by cadaveric kidneys from donors with subarachnoid haemorrhage.

Evidence for hypertension was sought retrospectively in the necropsy records of 37 cadaveric kidney donors who had died of subarachnoid haemorrhage and 41 donors who had died of head injury, cerebral tumour, or (in a few instances) other causes. Mean relative heart weight in the donors with subarachnoid haemorrhage was 0.58 (1 SD = 0.09)% and in the other donors 0.52 (0.09)% (p less than 0.01), a difference unexplained by any factor other than a comparatively higher blood pressure in the donors who had died of subarachnoid haemorrhage. Blood pressure was analysed over 72 months after renal transplantation in 23 recipients with normal or near normal graft function and no evidence of chronic rejection or graft artery stenosis. Twelve patients who had received kidneys from donors with subarachnoid haemorrhage had consistently higher systolic blood pressures (p less than 0.004) and needed more antihypertensive treatment (p less than 0.0004) than the 11 recipients of kidneys from donors who had died of head injury or cerebral tumour. These observations suggest that cadaveric kidneys from donors dying of subarachnoid haemorrhage may induce or sustain hypertension after transplantation.

Adult↗
PubMed1985

Stage I endometrial carcinoma: a review of 140 patients primarily treated by surgery only.

One hundred patients with stage Ia and 40 patients with stage Ib endometrial carcinoma had hysterectomy and bilateral salpingo-oophorectomy performed as the only primary treatment. Sixty-two percent of the patients had well-differentiated tumors, 31% moderately differentiated, and 7% undifferentiated tumors. Information on myometrial invasion was not available. The overall 5-year survival was 0.92 and the 5-year survival by tumor grade 0.96, 0.90, and 0.80 for patients with grade 1, 2, and 3 tumors, respectively. Survival rates decreased significantly with increased tumor dedifferentiation. Prognosis was not affected by enlargement of the uterine cavity or by higher patient age. Of 7 cases of isolated vaginal or pelvic recurrence, 4 could by controlled by irradiation therapy. These results compared to reported results of combined therapy suggest, that in well-differentiated cases-the majority of stage I endometrial cancers-combined therapy of surgery and irradiation presents no advantage over simple hysterectomy.

Adult↗
PubMed1985

Haematuria.

Haematuria due to lesions such as haemangiomas, varicose veins etc. are seldom described. We present two patients with rare lesions causing gross haematuria that caused diagnostic problems since all the clinical investigations were negative. The lesions were diagnosed peroperatively with the use of a pyeloscope. In this way a nephrectomy was avoided.

Adolescent↗
PubMed1984

The influence of age on renal and extrarenal effects of frusemide.

The effect of frusemide 80 mg i.v. was compared during 24 h in 10 young and eight elderly healthy male volunteers following a 24 h control period in the ward. During the 30 min following the injection the increments in excretion of urine, sodium, potassium and frusemide were significantly smaller in the elderly. The 24 h increase in sodium excretion was significantly larger in the 0 young and eight elderly healthy male volunteers following a 24 h control period in the ward. During the 30 min following the injection the increments in excretion of urine, sodium, potassium and frusemide were significantly smaller in the elderly. The 24 h increase in sodium excretion was significantly larger in the 0 young and eight elderly healthy male volunteers following a 24 h control period in the ward. During the 30 min following the injection the increments in excretion of urine, sodium, potassium and frusemide were significantly smaller in the elderly. The 24 h increase in sodium excretion was significantly larger in the elderly. The endogenous 24 h creatinine clearance was reduced by 12% (P less than 0.01) in both age groups. The frusemide induced changes in the 8 h serum concentration curves for albumin differed significantly between the two groups (analysis of variance, P less than 0.01). The drug induced increase in albumin concentration became significant in the young 5 min after the injection. In the elderly it took more than 15 min before the increase in serum albumin reached significance. The average maximal increase in albumin concentration was 14.3% in the young and 9.7% in the elderly (P less than 0.05). No difference was seen between the two age groups in the significant frusemide induced increases in the 24 h albumin excretion but in the elderly a significantly larger decrease in the 24 h excretion of beta 2-microglobulin was observed (P less than 0.05). No significant age difference was observed in the initial significant increases in diastolic blood pressure observed in both age groups or between the later changes in systolic blood pressure which was significantly reduced in the young only. The slower haemoconcentration response in the elderly seemed associated with the slower secretion rate of frusemide to the tubular lumen. We found no evidence of an age related difference in tubular cell response to frusemide. It is emphasized that a maximal initial frusemide response in the elderly, in contrast to what was found in the young, probably was not achieved by the 80 mg i.v.

Adult↗
PubMed1984

The influence of intravenous furosemide on the renal excretion pattern of protein and protein degradation products.

To assist the attending physician who may have difficulties in deciding whether observed deviations from normal renal physiology are disease-induced or diuresis-induced we studied urinary excretion rate of proteins and protein degradation products in eight healthy male volunteers between 60 and 70 years. After a 24 hr control period in the ward the subjects received 80 mg furosemide intravenously. The 24 hr creatinine clearance was reduced from 95 +/- 9 to 83 +/- 6 ml/min. (P less than 0.05). The reduction in the 24 hr carbamide clearance from 35.8 +/- 9.4 to 33.1 +/- 6.2 ml/min. was not significant. The urinary pH was significantly increased during the first hour but after the pH showed a fall which was significant during 2-8 hours after the injection. Initially the urate excretion showed an apparent increase but from 1-8 hours after the injection significantly less urate was excreted. The 24 hr urate clearance was reduced by furosemide from 5.3 +/- 1.6 to 3.4 +/- 1.1 ml/min. (P less than 0.05) and the amount of urate excreted was reduced from 2.6 to 1.6 mmol per 24 hrs (p = 0.05). The excretion rate of beta 2-microglobulin was reduced (P less than 0.01) whereas the excretion rate of albumin was increased (P less than 0.05).

Aged↗
PubMed1984

Bilateral diffuse malignant melanoma of the uvea associated with large cell carcinoma, giant cell type, of the lung. Case report of a newly described syndrome.

A new syndrome consisting of bilateral diffuse malignant uveal melanoma and simultaneous occurrence of another systemic malignant neoplasm was described in 6 patients in 1982. The present study reports a seventh case. Our patient was younger than the patients previously reported. He had large cell carcinoma of the right lung. The bilateral intraocular neoplasm was characterized as a diffuse malignant uveal melanoma of the mixed cell type by light microscopy and by transmission electron microscopy. All parts of the tumor contained S-100 protein. In addition to the two primary neoplasms, the patient had a combination of Ota's and Ito's naevi on the left side.

Carcinoma, Small Cell↗