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Biomedical subjects

M Fleischmann

Publications and source records attributed to M Fleischmann.

29 records · Page 2Linked to original sources
PubMed1992

Induction of myelo-monocytic My7 antigen (CD13) expression by interferon-alpha in basal cells of cutaneous T-cell lymphomas.

The My7 antigen that is expressed on the basal cells in normal skin and inflammatory disorders is absent in the lesions of cutaneous T-cell lymphoma (CTCL). Induction of My7 expression in basal cells in the cutaneous lesions of 12 patients with mycosis fungoides and three with Sézary syndrome treated with interferon-alpha 2a (IFN-alpha 2a) for 10 months was investigated. Biopsies were taken from the same area before treatment and after 2, 6 and 10 months of therapy with IFN-alpha 2a. My7 antigen was expressed on the basal cells only in those patients who showed either a complete or partial response to therapy with IFN-alpha 2a.

Antigens, CD↗
PubMed1991

Analysis of yeast prp20 mutations and functional complementation by the human homologue RCC1, a protein involved in the control of chromosome condensation.

Mutations in the PRP20 gene of yeast show a pleiotropic phenotype, in which both mRNA metabolism and nuclear structure are affected. srm1 mutants, defective in the same gene, influence the signal transduction pathway for the pheromone response. The yeast PRP20/SRM1 protein is highly homologous to the RCC1 protein of man, hamster and frog. In mammalian cells, this protein is a negative regulator for initiation of chromosome condensation. We report the analysis of two, independently isolated, recessive temperature-sensitive prp20 mutants. They have identical G to A transitions, leading to the alteration of a highly conserved glycine residue to glutamic acid. By immunofluorescence microscopy the PRP20 protein was localized in the nucleus. Expression of the RCC1 protein can complement the temperature-sensitive phenotype of prp20 mutants, demonstrating the functional similarity of the yeast and mammalian proteins.

Alleles↗
PubMed1980

Alamethicin-induced conductances in lipid bilayers: I. Data analysis and simple steady-state model.

Conductance flucutations induced by low concentrations of alamethicin in planar lipid bilayer membranes have been examined with a novel computer-aided analysis. A precise test is applied to show that the system is Markovian (except for the zeroth state) and an estimate is given for the (small) number of transitions between nonadjacent states: the system closely conforms to a birth-and-death process. The complete set of rate parameters governing the steady-state distribution is derived, and it is shown that these parameters can be used to reconstruct exactly the experimental relative frequency distribution. It is also shown that the electrochemical free energies of the conductance states vary quadratically with state number for low-lying states; the free energies of activation of both the birth and death processes are linearly related to the free-energy differences between states but the transfer coefficient is close to unity. A detailed model based on the nucleation of a two-dimensional pore accounts for these observations provided both birth and death take place via an intermediate expansion of the pore lumen. This model requires two energy parameters, the "edge" and "bulk" energies of the pore, together with a trigger rate of the initial process which is a sufficient description for the steady-state behavior of this voltage-controlled system.

Alamethicin↗