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Biomedical subjects

M Matejka

Publications and source records attributed to M Matejka.

72 records · Page 4Linked to original sources
PubMed1983

[Immunohistochemical detection of prostaglandins using immunoperoxidase (PAP) exemplified by a human tumor tissue].

The possibility of detecting prostaglandins by means of indirect immunoperoxidase-method is reported allowing a differentiation between actual synthesis and inactive metabolites. This technique allows the detection of all important prostaglandins in tissue samples and opens a new route for discovery of prostaglandin synthesis profile of a particular cell type or the electron microscopical localization. Its application in normal and pathological tissue structures will assess the patho-diagnostic value of this new method in the near future.

Carcinoma, Squamous Cell↗
PubMed1983

6-oxo-PGF1 alpha -a new tumour marker for tumours in the maxillo-facial region.

The diagnosis of secondary or recurrent tumour growth after operations on primary maxillo-facial tumours is still only possible at a late stage. On the other hand, the prostaglandins of the E series assume an important role in connection with tumour growth. The present investigation succeeded for the first time in detecting an increase in the level of 6-oxo-PGF1 alpha, the stable metabolite of PGI2, before planned radical operation in patients with maxillo-facial tumours. In the further course of the illness it was possible to establish a correlation between the plasma values and the occurrence of metastasis or recurrence of disease. These results indicate that a certain significance can be attributed to 6-oxo-PGF1 alpha as a tumour marker.

6-Ketoprostaglandin F1 alpha↗
PubMed1981

[Abuse of phenacetin-containing analgesics and carcinoma of the renal pelvis (author's transl)].

39 carcinomas of the renal pelvis diagnosed between 1968 and 1979 were retrospectively examined for capillary sclerosis in the ureters, which is pathognomonic of phenacetin abuse by the patient. We detected that 40% of the patients displayed capillary sclerosis; abuse was recorded in the case histories in only one quarter of these patients with capillary sclerosis. Hence if follows that 1. the sale of phenacetin-containing analgesics without medical prescription should be prohibited by legislation; 2. physicians, as well as patients, should be informed much more intensively about this problem; 3. patients who are known to abuse phenacetin-containing analgesics must be submitted to regular cytological examination of the urine.

Capillaries↗
PubMed1981

[A malignant mixed tumor of the breast].

A case of a malignant mixed tumor of the female breast is presented. The epithelial part of it showed characteristics of a benign adenoma, the mesenchymal component those of a polymorphonuclear and spindle cellular sarcoma. Pathogenesis and histogenesis of this neoplasm as well as the literature on the subject are discussed. The incidence of this tumor and of sarcomas of the breast, in general is reported.

Adenoma↗
PubMed1980

Evidence that thrombus organizing blood derived cells produce prostaglandin I2-.

An artificial vessel replacement, which is athrombogenic and impermeable for a migration from the adjacent tissue, was implanted end to end into the thoracic aorta of 10 sheep. The center of this tube has a Dacron surface, which is known to trap blood elements. We examined the tissue samples built up by blood derived cells between 2 and 84 days morphologically by means of light microscopy as well as by SEM and TEM. We checked the thrombus fragments of 7 cases for their PGI2-generation using MONCADA's bioassay. In our specimens we found an average activity of 4, 7 pg PGI2 mg/min. The morphological examination revealed different stages of thrombosis and organization consisting of a large number of cells. Macrophages, fibroblast like cells, myofibroblasts as well as endothelial cells and foreign body giant cells around the Dacron fibers could be found. Our experimental design excludes the ingrowth of mesenchymal elements, which suggests that blood derived cells are able to produce PGI2.

Aging↗
PubMed1974

BCG vaccination of children against leprosy: nine-year findings of the controlled WHO trial in Burma.

The leprosy incidence rates so far in the vaccinated and unvaccinated children aged 5-9 and 10-14 years are similar. The BCG-vaccinated children aged 0-4 years at intake had an incidence rate lower than that of children in the control group. BCG vaccination did not protect household contacts or children aged 5-14 years not exposed in the household, and did not influence the distribution of the forms of leprosy in the cases detected. The lepromin reaction in relation to the age at intake was consistently stronger in the vaccinated children than in those of the control group; the younger the age group the more pronounced was the difference, which was only slight in the age group 10-14 years at intake. If the results of the late lepromin reaction are related to the age at onset (when the children are older than at intake), the differences between the BCG and the control groups tend to decrease. It does not seem that the BCG-vaccinated children suffer from a less serious form of leprosy than the nonvaccinated children (most of them nonreactors to tuberculin).

Adolescent↗
PubMed1973

BCG vaccination of children against leprosy: seven-year findings of the controlled WHO trial in Burma.

A controlled study of the efficacy of BCG vaccination for the prevention of leprosy began in Burma at the end of August 1964. This paper presents the findings after 7 years-i.e., the results of 6 annual follow-up examinations up to the end of June 1971. The incidence rate in BCG-vaccinated children 0-4 years of age at intake was lower than that in children in the control group. The protection conferred by BCG was relatively low (44%) and applied only to early cases of leprosy, the great majority tuberculoid cases. BCG vaccination did not protect household contacts or children 5-14 years of age who were not exposed in the household. This reduction must be interpreted in the light of several factors: form of leprosy, bacterial status, lepromin reactivity, evolution of cases, and level of endemicity. Consequently it does not seem probable that the reduction in incidence would substantially affect the pattern or trend of the disease in an area similar to that where the study is being carried out; the probability would be much lower if not nil in regions of relatively low endemicity (1-2 per 1 000 or less).

Adolescent↗
PubMed1970

BCG vaccination of children against leprosy. Preliminary findings of the WHO-controlled trial in Burma.

The use of BCG vaccine in the prevention of leprosy has been one of the most important subjects of investigation in the field of leprology in the last 25 years. The action of the vaccine was for many years investigated by determining its effect on the lepromin reaction. Field studies were later considered essential to determine whether BCG vaccination would be useful to leprosy contacts, to the child population probably exposed to infection, or to persons persistently lepromin-negative.The interest of the World Health Organization in this matter began in 1952 and, following the recommendations of certain advisory committees, it was decided to institute a field trial in Singu township in Burma. The main purpose of the investigation was to observe, in a highly endemic area, the protective effect, if any, of BCG vaccine against leprosy in the child population not exposed to Mycobacterium leprae at home but possibly exposed to the infection elsewhere.Field operations began at the end of August 1964 and the preliminary findings obtained up to the end of June 1968 relate to 3 annual re-examinations. So far, from the material studied, it appears that, under the conditions prevailing in Singu township, no significant effect of BCG vaccine can be seen within a period of 3 years. When children in both trial groups are followed-up for much longer periods, mainly children aged 0-4 years at intake, it is possible that a significant difference may emerge. However, to be operationally desirable, a merely significant difference is not enough; the protective effect of BCG should be substantial to warrant its large-scale use as an immunization procedure against leprosy.

Adolescent↗
PubMedDate not supplied

Effect of ursodeoxycholic acid administration on bile acid composition in hamster bile.

The modification in the composition of bile acids in hamster by the administration of high dose of ursodeoxycholic acid (UDCA) was investigated. Male Golden Syrian hamsters were divided into five groups: a control group, two groups that received 0.5 g of UDCA per 100 g of standard diet during 30 and 60 days and another two groups that received 1 g of UDCA per 100 g of standard diet during 30 and 60 days. After ether anaesthesia the gallbladder was removed and bile was immediately aspirated. Bile acids were determined by high performance liquid chromatography (HPLC). Taurolithocholic (TLCA) and glycolithocholic acids (GLCA) increased significantly in all treated groups. The glyco/tauro ratio of 0.69 in controls became more than 1 in treated animals except in the case of lithocholic acid (LCA) conjugates which remained less than 1. UDCA derivatives increased proportionally to the administered dose and the cholic/cheno ratio diminished significantly. A moderate increase of 3- and 7-keto derivatives of chenodeoxycholic acid (CDCA) was observed in all treated groups but the above mentioned increment was especially evident in 3-keto derivatives. A high percentage of UDCA administered in the hamster was likely transformed to CDCA and the glyco conjugates of the bile acids were the predominant species except for the LCA derivatives.

Animals↗
PubMedDate not supplied

Incidence and suggested surgical management of septa in sinus-lift procedures.

A variable number of septa, also referred to as Underwood's septa, divide the floor of the maxillary sinus into several recesses and may thus cause various complications during sinus-lift procedures. The incidence of Underwood's septa was evaluated by examining 41 edentulous maxillas. In 13 of these maxillas (31.7% of the cases), sinus floors with at least one septum were observed. Most of the septa were located in the region between the second premolar and the first molar. A possible cause of septal formation could be the variable phases of maxillary sinus pneumatization of the empty alveolar process following tooth extraction.

Adult↗