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- Larsson, LG, et al.
(författare)
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The Swedish randomised mammography screening trials: analysis of their effect on the breast cancer related excess mortality
- 1996
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Ingår i: Journal of medical screening. - : SAGE Publications. - 0969-1413 .- 1475-5793. ; 3:3, s. 129-32
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Tidskriftsartikel (refereegranskat)abstract
- –To apply an indirect method for estimation of the breast cancer related excess mortality in the Swedish randomised mammography screening trials.Setting–Randomised trials on mammography screening have, in Sweden, been performed in the counties of Kopparberg (W) and Östergötland (E), the so called WE study, and in the three largest cities in Sweden, Stockholm (southern part), Gothenburg, and Malmö. An overview of the trials was presented in the Lancet in 1993 and included 156 911 women in the invited group and 125 866 in the control group.Methods–The excess mortality in the breast cancer subgroups was estimated by indirect standardisation using official national cause of death statistics according to Statistics Sweden as a reference. Results—The estimated reduction of the breast cancer related mortality was 24% for the whole group (40–74 years at randomisation). The corresponding figures for the age groups 40–49, 50–59, and 60–69 years were 6%, 28%, and 34% respectively.Conclusion–The results are very similar to those presented earlier based on the traditional comparison of the breast cancer mortality in the invited and in the control group. This analysis further strengthens previous reports on a beneficial effect of mammography screening, which is especially pronounced in the age group 50–69.
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- Larsson, C, et al.
(författare)
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The importance of the glycerol 3-phosphate shuttle during aerobic growth of Saccharomyces cerevisiae.
- 1998
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Ingår i: Yeast (Chichester, England). - 0749-503X. ; 14:4, s. 347-57
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Tidskriftsartikel (refereegranskat)abstract
- Maintenance of a cytoplasmic redox balance is a necessity for sustained cellular metabolism. Glycerol formation is the only way by which Saccharomyces cerevisiae can maintain this balance under anaerobic conditions. Aerobically, on the other hand, several different redox adjustment mechanisms exist, one of these being the glycerol 3-phosphate (G3P) shuttle. We have studied the importance of this shuttle under aerobic conditions by comparing growth properties and glycerol formation of a wild-type strain with that of gut2 delta mutants, lacking the FAD-dependent glycerol 3-phosphate dehydrogenase, assuming that the consequent blocking of G3P oxidation is forcing the cells to produce glycerol from G3P. To impose different demands on the redox adjustment capability we used various carbon sources having different degrees of reduction. The results showed that the shuttle was used extensively with reduced substrate such as ethanol, whereas the more oxidized substrates lactate and pyruvate, did not provoke any activity of the shuttle. However, the absence of a functional G3P shuttle did not affect the growth rate or growth yield of the cells, not even during growth on ethanol. Presumably, there must be alternative systems for maintaining a cytoplasmic redox balance, e.g. the so-called external NADH dehydrogenase, located on the outer side of the inner mitochondrial membrane. By comparing the performance of the external NADH dehydrogenase and the G3P shuttle in isolated mitochondria, it was found that the former resulted in high respiratory rates but a comparably low P/O ratio of 1.2, whereas the shuttle gave low rates but a high P/O ratio of 1.7. Our results also demonstrated that of the two isoforms of NAD-dependent glycerol 3-phosphate dehydrogenase, only the enzyme encoded by GPD1 appeared important for the shuttle, since the enhanced glycerol production that occurs in a gut2 delta strain proved dependent on GPD1 but not on GPD2.
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- Nystrom, L, et al.
(författare)
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An overview of the Swedish randomised mammography trials: total mortality pattern and the representivity of the study cohorts
- 1996
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Ingår i: Journal of medical screening. - : SAGE Publications. - 0969-1413 .- 1475-5793. ; 3:2, s. 85-7
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Tidskriftsartikel (refereegranskat)abstract
- –To analyse the cause of death pattern in the cohorts of women included in the Swedish randomised mammography screening trials by comparing the groups of invited and control women both with each other and with the general population of Swedish women. Setting –Since 1977 four randomised trials of mammography screening have been performed in Sweden: Malmö, Kopparberg and ÖOstergötland (the two county trial), Stockholm, and Gothenburg. Design –Overview of four randomised mammography screening trials. Results –The total numbers of deaths in the invited and control groups respectively were 15 695 and 11 887 corresponding to a relative risk (RR) of 1.00. There were no significant differences between the invited and control groups for cause-specific mortality, except for breast cancer. When the total mortality in the invited and the control groups was compared with that for Swedish women in general the standardised mortality ratio was close to 100. Conclusions –The cause of death pattern in the invited group was, except for breast cancer, very similar to that in the control group, showing that the groups were comparable. Similarly, the total mortality including breast cancer mortality in the control group was almost identical to that in Swedish women in general. The same was true, with the exception of breast cancer, for the invited group. These observations confirm that the trial cohorts are representative of Swedish women and indicate that the quantitative results from these trials may safely be generalised to the Swedish population.
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- Onyango, I, et al.
(författare)
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Effects of extracellular calcium on the subcellular translocation of bovine parathyroid PKC isozymes.
- 1999
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Ingår i: Experimental Cell Research. - : Elsevier BV. - 0014-4827 .- 1090-2422. ; 247:1, s. 9-16
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Tidskriftsartikel (refereegranskat)abstract
- The release of parathyroid hormone is regulated by the extracellular concentration of Ca2+ through a sensor(s) on the surface of the parathyroid cells, but few details are known on the further relay of the signal inside the cell. Activation of protein kinase C (PKC) isozymes is associated with their translocation from the cell soluble fraction to the particulate fraction of the cell. Therefore, identification of a subcellular localization of a PKC isozyme in parathyroid cells as a response to changes in extracellular Ca2+ should be an indication for its putative role in signal transduction coupled to the Ca2+ sensor. We have determined the subcellular localization of six PKC isozymes (alpha, betaI, betaII, epsilon, zeta, and iota) in nonstimulated parathyroid cells and in those treated with low (0.5 mM) and high (3.0 mM) extracellular Ca2+ by confocal microscopy. At the physiological concentration of serum Ca2+, all PKC isozymes studied were localized mainly to the cytosol, although to different extents. Low extracellular Ca2+ caused a redistribution of PKCalpha to the periphery of the cells. In contrast, PKCbetaI, -epsilon, -zeta, and -iota were translocated to the periphery of the cells at high extracellular Ca2+. These results indicate that PKCalpha, -betaI, -epsilon, -zeta, and -iota are involved in the response of parathyroid cells to changes in extracellular Ca2+.
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