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Biomedical subjects

J J Hoffmann

Publications and source records attributed to J J Hoffmann.

At least 73 records · Page 4Linked to original sources
PubMed1985

Systemic effects of BRL 26921 during thrombolytic treatment of acute myocardial infarction.

The effects of BRL 26921, an active-site acylated streptokinase-plasminogen complex, on the fibrinolytic and coagulation systems were studied in 13 patients treated for acute myocardial infarction with a short intravenous infusion of 30 mg of the new drug. In 12/13 patients (92%) significant changes were observed in the concentrations of fibrinogen, fibrin(ogen) degradation products, plasminogen, alpha 2-antiplasmin and F VIII:C; all changes indicating a substantial degree of systemic fibrinolysis. In only one patient were no signs of systemic activation of the fibrinolytic system observed. The therapeutic efficacy of the drug was 85% in this study.

Adult↗
PubMed1985

Plasma cell acid phosphatase score in multiple myeloma and related disorders.

A detailed classification of plasma cells stained for acid phosphatase activity is introduced. With this method, patients with multiple myeloma, non-myeloma gammopathies, reactive plasmacytosis and other diseases in which plasma cells are involved, were investigated. The results show that our method can discriminate between multiple myeloma and reactive plasmacytosis. The overlap between multiple myeloma and other monoclonal gammopathies is much smaller than observed in other studies. Surprisingly low levels of acid phosphatase activity were found in the cells from patients with lymphoplasmacytoid immunocytoma. It is concluded that the acid phosphatase score can be of value for studying disorders in which plasma cells are involved.

Acid Phosphatase↗
PubMed1983

Effects of intravenous endralazine in essential hypertension.

The effects of endralazine, administered intravenously, on blood pressure, heart rate, forearm blood flow, plasma renin activity, aldosterone, adrenaline and noradrenaline were studied in five patients with essential hypertension. Endralazine reduced peripheral vascular resistance, resulting in decrease in mean arterial pressure from 141 to 116 mm Hg and increase in heart rate from 67 to 92 beats/min. Plasma renin activity, adrenaline and noradrenaline increased significantly after endralazine infusion. All effects observed are consistent with endralazine acting as a peripheral vasodilating drug.

Adult↗
PubMed1982

Radioenzymatic assay of plasma adrenaline and noradrenaline: evidence for a catechol-O-methyltransferase (COMT) inhibiting factor associated with essential hypertension.

During the evaluation of a modified radioenzymatic determination of plasma adrenaline and noradrenaline, it has been found that there exists a highly significant (p less than 0.001) negative correlation between the amount of radioactivity incorporated in the internal standard added to plasma and the period during which the plasma had been stored at -25 degrees C, but only in plasma from patients with essential hypertension. Plasma from normotensive persons exhibits a complete lack of correlation between these factors. The consequences of the hypertension-associated COMT-inhibiting factor for the assays' specifications are discussed and data are presented for comparison with a recently described uremia-associated COMT-inhibitor (Demassieux et al, Clin Chim Acta 115, 377--391; 1981).

Animals↗
PubMed1981

Intermediate alpha 1-antitrypsin deficiency in atopic allergy.

In a population of over 200 patients with atopic bronchial disease, significantly increased frequencies of the alpha 1-antitrypsin Pi-types of intermediate deficiency (Pi MZ and Pi MS) were found. As far as we are aware of, this report is the first in which strictly objective criteria for patient classification with respect to atopy have been used. A possible biochemical basis for the phenomenon is presented.

Adolescent↗
PubMed1978

Comparison of reagents for determining the activated partial thromboplastin time.

Six commercially available reagents for the determination of the activated partial thromboplastin time have been evaluated and compared with respect to their sensitivity to the coagulation factors VIII, IX and XI and to their response to heparin. Some variation was observed among the reagents regarding their sensitivity to factor XI and even greater differences were obtained with factors VIII and IX. It was also clear that none of the reagents was sensitive to the same extent to the factors tested. The sensitivity to heparin shows considerable variation, in terms of time as well as mode of response to increasing heparin levels. In four reagents this response is linear, it is logarithmic in one and the remaining one is yet again different. It seems unlikely that any standardization of the APTT determination is at present possible with the reagents studied.

Factor XI Deficiency↗
PubMed1978

Odoratin and paucin: cytotoxic sesquiterpene lactones from Baileya pauciradiata (Compositae).

An ethanol extract of Baileya pauciradiata exhibited cytotoxic activity against the human epidermoid carcinoma of the nasopharynx and the lymphocytic leukemia test systems. Two constituents responsible for this activity were isolated and identified as odoratin and paucin. Their identities were proven by IR, PMR, and mass spectral data; elemental analysis; preparation of their acetates; and melting-point determinations. Odoratin was confirmed by comparison with an authentic sample.

Animals↗
PubMed1977

Application of isoelectric focusing in alpha1-antitrypsin phenotyping.

alpha1-Antitrypsin, the major protease inhibitor in human serum, occurs in a considerable number of variant forms, some of which are associated with lung and liver diseases. The identification of these genetic variants, generally called Pi-types, by means of isoelectric focusing is described, as well as investigations concerning the practical application of isoelectric focusing as a routine procedure for typing the variants of alpha1-antitrypsin. Finally, isoelectric focusing is compared with the most widely used Pi-phenotyping technique, namely acid starch-gel electrophoresis followed by immunoelectrophoresis in antibody-containing agarose gel.

Genetic Variation↗
PubMed1977

Cytotoxic and tumor inhibitory agent from Polygala macradenia Gray (Polygalaceae): 4'-demethyldeoxypodophyllotoxin.

The chloroform fraction of Polygala macradenia exhibited activity against the P-388 lymphocytic leukemia and human epidermoid carcinoma of the nasopharynx test systems. The constituent responsible for this activity was a lignan, 4'-demethyldeoxypodophyllotoxin (C21H20O7). The identity was proven by elemental analysis; PMR, IR, mass spectrometric, and melting-point determinations; and preparation of a derivative.

Animals↗
PubMed1977

Cytotoxic agents from Michelia champaca and Talauma ovata: parthenolide and costunolide.

The ethanol extract of Michelia champaca and the petroleum ether extract of Talauma ovata showed activity toward the human epidermoid carcinoma of the nasopharynx test system. The active constituents were sesquiterpene lactones, identified as parthenolide (C15H20O3) and costunolide (C15H20O2). Their identities were proven by elemental analyses, PMR, IR, and mass spectral data, melting-point and mixed melting-point determinations, and comparisons with authentic samples and spectra.

Antineoplastic Agents, Phytogenic↗
PubMed1977

Phytochemical investigation of Adenium obesum Forskal (Apocynaceae): isolation and identification of cytotoxic agents.

An ethanol extract of Adenium obesum exhibited cytotoxic activity against the human epidermoid carcinoma of the nasopharynx test system. Constituents in the active extract were identified as the cardenolides somalin, hongheloside A, 16-acetylstrospeside, and honghelin and the flavonol 3,3'-bis(O-methyl)quercetin. Their identities were proven by IR, UV, proton magnetic resonance, and mass spectrometry; elemental analyses; preparation of derivatives; and melting-point determinations. An inactive triterpene, dihydroifflaionic acid, and an inactive flavonol, 3-O-methylkaempferol, also were isolated and identified.

Antineoplastic Agents, Phytogenic↗
PubMed1976

A new, high frequency variant of alpha1-antitrypsin.

A new variant of alpha1-antitrypsin has been detected with the aid of isoelectric focusing on polyacrylamide slab gels. In contrast with many other variants this new alpha1-antitrypsin allele is found in 10-15% of the phenotypes examined. The electrophoretic properties of the new alpha1-antitrypsin variant in isofocusing polyacrylamide gels differ only slightly from the most common alpha1-antitrypsin allele M. On the basis of its electroforetic behaviour we propose the term MN to indicate this new protease inhibitor variant. The isofocusing technique employed, provides an easy to handle, very reproducible method for determining the alpha1-antitrypsin phenotype and can be employed for large scale screening.

Electrophoresis, Polyacrylamide Gel↗
PubMed1976

Automated determination of the antitrypsin activity of serum.

An automated determination of the serum antitrypsin activity is described in which all reaction parameters have been optimized. The determination is carried out by measuring the difference between the activity of a standard amount of trypsin with and without addition of serum. Trypsin activity is measured using N-alpha-benzoyl-L-arginine-p-nitroanilide as a substrate. The assay is performed by means of an automatic enzyme reaction rate analyser the Vitatron AKES. The antitrypsin activity is expressed in Inhibitor Units making standardization of the trypsin preparation superfluous. Normal values of the antitrypsin activity for some of the most frequently occurring genetic variants of alpha1-antitrypsin are given.

Autoanalysis↗