Sum peak method applied to the study of human platelet cells

The sum peak method based on the phenomenon of perturbed angular correlation was applied to study the chemical environments of 111In in intact platelet cells. The sum peak appearing in the gamma-ray spectrum of 111In which emits two gamma-rays in cascade was observed for 111InCl3 solutions and 111In-labeled platelets. An increase in intensity ratios of the sum peak to its single peak was found when 111In incorporated into platelets from its aqueous solution. This fact was discussed in terms of physico-chemical environments of 111In together with an evaluation of sum peak analysis in the spectra.

Influence of vitamin E on platelet survival

Vitamin E plays an important role in protecting fat tissue from peroxidation. Platelet survival was compared among vitamin E deficient, control and alpha-tocopheryl nicotinate supplemented rats. The mean tocopherol level in the sera of the rats fed vitamin E deficient diet for two months was 21.5% of control, and the lipoperoxide level in the sera of these animals had not significantly (p greater than 0.05) increased. Platelet aggregation was not accelerated significantly (p greater than 0.05) after exposure to a concentration of 10 microM of ADP used as an aggregating agent. The rate of platelet survival was determined by the 51Cr-labeling technique. The survival rates were all normal in vitamin E deficient, control and alpha-tocopheryl nicotinate supplemented rats, with no significant difference (p greater than 0.1) among the groups. These results suggest that depletion of vitamin E per se does not shorten the periods of platelet survival.

Prolongation of platelet survival in idiopathic thrombocytopenic purpura by high-dose intravenous gamma globulin

The mechanism of the increase of platelet counts after the intravenous injection of high dose gammaglobulin was evaluated by measuring platelet survival before and after the injection. The platelet survival after treatment prolonged more significantly than that before treatment. There was no evidence of platelet release from bone marrow to peripheral blood. These findings might suggest the inhibition of platelet destruction by transient blockade of reticuloendothelial system.

[Rhabdomyosarcoma of the heart involving the left ventricle and left atrium]

A case of rhabdomyosarcoma of the left atrium and left ventricle demonstrated by echocardiography was reported. A 31-year-old man was admitted to our hospital for evaluation of recently developed exertional dyspnea. A holosystolic murmur and a protodiastolic sound were audible at the apex. A chest X-ray showed pulmonary congestion without cardiomegaly. The two-dimensional echocardiogram showed a dense stratified mass of echoes occupying the medial half of the left ventricular cavity, and a part of the abnormal mass of echoes was observed to move toward the left ventricular outflow tract during systole. Another small mass attached to the anterior mitral leaflet was also observed to prolapse partly into the left atrium during systole. The interatrial septum showed a thick and hard band of echo in the short-axis view. Right cardiac catheterization revealed pulmonary hypertension and the levogram of the pulmonary angiography showed left atrial and left ventricular filing defects. The repeated echocardiographic study showed the growth of the abnormal mass. The patient underwent operation, but he died of congestive heart failure thereafter. The necropsy diagnosis was rhabdomyosarcoma of the heart, involving the left atrium and left ventricle.

Detection of platelet consumption in aortic graft with 111In-labeled platelets

Increased platelet consumption in two patients with aortic graft was detected by scintiphotography using 111In-labeled autologous platelets. There was shortened platelet survival time in these patients. These findings might suggest that platelet consumption in aortic prosthesis is related to thrombogenesis.

The effect of RES blockade on red blood cell survival

The effect of RES blockade on the survival of heat-damaged and antibody coated red blood cells was evaluated in C3H mice. RES function of C3H mice was determined by the survival of 59Fe-labeled, heat-damaged red blood cells at 49 degrees C for 30 min. When animals were treated with an intravenous injection of non-labeled, heat-damaged red blood cells for the blockade of RES, red blood cell destruction was depressed in non-splenectomized and splenectomized mice. In the survival or organ distribution of 59Fe-labeled, antibody-coated red blood cells, no difference was noted between animals with and without blockade. These findings suggest that heat-damaged red blood cells were destructed predominantly in the splenic RES and antibody coated cells were not broken down only by the splenic RES.

[Clinical evaluation of cefotiam in internal medicine, with special reference to infectious disease associated with hematological disorders (author's transl)]

Clinical evaluation of cefotiam (panspolin), a new cephem antibiotics, was performed in the infectious disease associated with hematological disorders and in the respiratory system. In hematological dis orders, 40% of good and 25% of fair results were obtained in clinical effects. In respiratory infections, however, 92% of good results were obtained. Opportunistic infection due to Gram-negative bacilli are often experienced in patients with leukemia. Since cefotiam has sufficient bacteriocidal effects in broad spectrum, it would be a good therapeutic agent against infectious diseases associated with hematological disorders.

Characterization of aminoindamines and aminoindoanilines formed by oxidative hair dyeing and their mutagenicity

2-Amino-5-methoxy-2'(or 3')-methylindamine and 2-amino-5-methoxy-2'(or 3')-methylindoaniline were isolated from a coloring matter formed by oxidative condensation of 2,5-diaminotoluene with 2,4-diaminoanisole, and their structures were elucidated on the basis of nuclear magnetic resonance and mass spectral data. These two main components of the oxidation product formed at the early stage exhibited a positive result in the mutagenicity test on the thin-layer chromatography plate. The mutagenic activities of purified aminoindamines and aminoindoanilines against Salmonella typhimurium TA 98 were as strong as that of 2-acetamidofluorene. It was also demonstrated that 5-methoxy-2'(or 3')-methylindamine was formed in 10% yield under the conditions used for hair dyeing and the yield was dependent upon the molar ratio of 2,5-diaminotoluene to 2,4-diaminoanisole.