Presence of HLA-D/DR antigens on the membrane of breast tumour cells

HLA-D/DR (Ia) glycoproteins were identified in human breast carcinoma and normal mammary gland cells by means of an anti-Ia monoclonal antibody. Two techniques were used: (1) immunoperoxidase staining performed on histological sections and (2) Ia glycoproteins were isolated as follows: firstly by radioactive labelling of isolated cells, then by filtration on Sephadex G25, followed by Lens culinaris chromatography, and immune complex formation and then elution on protein A-Sepharose. Lastly, the immune complex was studied by chromatofocusing. Both techniques revealed that Ia expression was found in carcinoma cells, but not in normal cells.     

Development of enhanced blood flow responses to prostaglandin E1 in carrageenan-induced granulation tissue

The distribution of cardiac output (c.o.) was measured by the radioactive microsphere method in rats at different time intervals after the implantation of carrageenanimpregnated sponges. The amount of blood distributed to the developing granulomata increased from day 5 after sponge implantation to day 7, but showed no further increase at day 10. A similar pattern in blood flow was observed in the skin covering the granulomata. Injection of PGE₁ (100 ng) into the sponges led to an increase in blood flow, the magnitude of which became gradually larger between days 5 and 10. A similar, though less marked increase in sensitivity to PGE₁ was observed in the skin covering the granulomata, PGE₁ causing a significant increase in blood flow to the skin on day 10. These changes in sensitivity to exogenous PGE₁ may be due to decreasing levels of endogenous PGE and/or maturation of the newly formed blood vessels in the granulation tissue.     

Potentiation of FMD vaccines with polycationic-nucleic acid complexes

Summary The effect of various polycations on the immune response potentiated with poly I:C was studied. It was found that low molecular weight polycations had no potentiating effect. Polylysine was ineffective whereas protamine was superior to lysozyme, poly-arginine, poly-histidine, DEAE-Dextran and histone.A foot-and-mouth disease trivalent vaccine composed of strains A₂₄ Cruzeiro, O₁ Caseros and C₂ Resende elicited no immune response in swine when adjuvanted with aluminium hydroxide but was effective when emulsified in oil. In general, the immune response was potentiated ten-fold when the emulsion contained poly I:C. The antibody production was in most cases further potentiated by a factor of ten when the nucleic acid double-strand was complexed with 1:10 (w/w) DEAE-Dextran. Protamine was as effective, or perhaps even more, than DEAE-Dextran to this effect.Guinea pigs vaccinated with a water-in-oil emulsion type monovalent C₃ vaccine showed an increase in antibody production when the vaccine contained poly I:C or poly I:C complexed with 1:10 (w/w) protamine.With 4 Figures     

The force-velocity relationship of arm flexion in untrained males and females and arm-trained athletes

Summary The force-velocity curve (FVC) of arm flexion was established in 123 untrained males and 110 untrained females aged from 15 to 36 years, and 48 arm-trained athletes competing in different sport disciplines. The FVC was described by Hill's equation and defined by the parameters: maximal static moment (M₀), maximal angular velocity (₀), maximal power (P₀) and the concavity of the FVC (H). Within the given age range the level of the curve parameters of both untrained men and women was independent of age.On average, H was the same in all three groups. As compared to M₀ of the untrained males, M₀ of the athletes was 33% higher and M₀ of the females was 38% lower; with regard to P₀ these differences were +30% and –43% respectively. ₀ was the same for trained and untrained males, wherease ₀ of the women was 10% lower than ₀ of the men.     

Interaction of biodegradable β-whitlockite ceramics with bone tissue: An in vivo study

The biodegradation of different porous β-whitlockite materials are studied by in vivo experiments, radiographie follow-ups and light microscopy observations. The materials were implanted in rabbit tibiae for 16 mnth. Micropores play an important role in the biodegradation rate. The resorbing materials evoke an inflammation with plasma cells. The resorption starts in the medulla, and the phagocytosed particles are removed to the lymph nodes. Normal bone function can be restored after all the implant material is resulted.     

Macrophage antitumor activity in vitro. Comparative analysis of cytolytic, cytostatic, and cytotoxic activities of mouse macrophages and human monocytes

Mouse peritoneal M phi and human blood monocytes were assayed for their antitumor activity in vitro with a cytolysis, a cytostasis and a cytotoxicity test performed in parallel. Both natural and stimulus-induced M phi antitumor capacities were assessed. Results indicate that natural cytolytic activity of unstimulated M phi is generally unable to restrict final tumor cell growth, since it is not coupled with cytostatic capacity. In contrast, exposure of M phi in vitro to either MAF or IFN-beta, besides augmenting M phi cytolytic capacity, induced a very significant cytostatic activity and thus efficiently restricted the survival of tumor cells.     

Trisomy 6qter

A previously reported patient with trisomy for the distal part of 6q was shown by R-banding to be trisomic for 6q26qter, due to a t(6;22)(q26;p12) mat. Altogether nine patients with 6qter trisomy have been reported. The main features of the 6qter trisomy syndrome are: severe mental and growth retardation; acrocephaly and brachycephaly; a carp-shaped mouth; micrognathia; a very short neck with unusual anterior webbing; joint contractures; the absence of severe inner organ malformations; and survival into adulthood.     

Hemolytic uremic syndrome with hypocomplementemia, serum C3NeF, and glomerular deposits of C3

A 4-year-old boy had hemolytic uremic syndrome (HUS) associated with depression of serum C3 level, a B-hemolytic streptococcal throat infection, and an elevated level of antistreptolysin O titer. In addition to the characteristic histologic changes associated with this syndrome, substantial infiltration of polymorphonuclear leukocytes and nodular deposits of C3 globulin were seen in the glomeruli of the first biopsy specimen. Two months after clinical remission, he had a recurrence of hemolytic anemia, thrombocytopenia, and acute renal failure. The serum C3 concentration had decreased again, and serum C3NeF was detected in the serum. The typical changes associated with HUS were still present on electron microscopy. Bilateral nephrectomy and renal transplantation were done because of the development of uncontrollable severe hypertension and increasing azotemia. This patient had three manifestations of HUS, but because of several differences, such as hypocomplementemia, serum C3NeF, a recurrence, and persistent glomerular deposits of C3 globulin, he appears to have had a different form of the syndrome.     

Multivariate Genetic Analysis of Brain Structure in an Extended Twin Design

The hunt for genes influencing behavior may be aided by the study of intermediate phenotypes for several reasons. First, intermediate phenotypes may be influenced by only a few genes, which facilitates their detection. Second, many intermediate phenotypes can be measured on a continuous quantitative scale and thus can be assessed in affected and unaffected individuals. Continuous measures increase the statistical power to detect genetic effects (Neale et al., 1994), and allow studies to be designed to collect data from informative subjects such as extreme concordant or discordant pairs. Intermediate phenotypes for discrete traits, such as psychiatric disorders, can be neurotransmitter levels, brain function, or structure. In this paper we conduct a multivariate analysis of data from 111 twin pairs and 34 additional siblings on cerebellar volume, intracranial space, and body height. The analysis is carried out on the raw data and specifies a model for the mean and the covariance structure. Results suggest that cerebellar volume and intracranial space vary with age and sex. Brain volumes tend to decrease slightly with age, and males generally have a larger brain volume than females. The remaining phenotypic variance of cerebellar volume is largely genetic (88%). These genetic factors partly overlap with the genetic factors that explain variance in intracranial space and body height. The applied method is presented as a general approach for the analysis of intermediate phenotypes in which the effects of correlated variables on the observed scores are modeled through multivariate analysis.