| CEA-Related Cell Adhesion Molecule 1 Molecular Cell, Volume 5, Issue 2, 1 February 2000, Pages 311-320 Süleyman Ergün, Nerbil Kilic, Gudrun Ziegeler, Arne Hansen, Peter Nollau, Julica Götze, Jan-Henner Wurmbach, Andrea Horst, Joachim Weil, Malkanthi Fernando and Christoph Wagener Summary CEA-related cell adhesion molecule 1 (CEACAM1) exhibits angiogenic properties in in vitro and in vivo angiogenesis assays. CEACAM1 purified from granulocytes and endothelial cell media as well as recombinant CEACAM1 expressed in HEK293 cells stimulate proliferation, chemotaxis, and capillary-like tube formation of human microvascular endothelial cells. They increase vascularization of chick chorioallantoic membrane and potentiate the effects of vascular endothelial growth factor (VEGF). VEGF increases CEACAM1 expression both on the mRNA and the protein level. VEGF-induced endothelial tube formation is blocked by a monoclonal CEACAM1 antibody. These data suggest that CEACAM1 is a major effector of VEGF in the early microvessel formation. Since CEACAM1 is expressed in tumor microvessels but not in large blood vessels, CEACAM1 may be a target for the inhibition of tumor angiogenesis. Summary | Full Text | PDF (406 kb) |
| Cytoplasmic microtubules in polymorphonuclear leukocytes: Effects of chemotactic stimulation and colchicine Cell, Volume 31, Issue 3, 1 December 1982, Pages 719-729 Donald C. Anderson, Linda J. Wible, Bonnie J. Hughes, C.W. Smith and B.R. Brinkley Summary Indirect immunofluorescent (IIF) techniques employing antitutulin and anticentrosome antibodies were modified for studies of migrating polymorphonuclear (PMNs) leukocytes exposed to gradients or uniform concentrations of chemotactic factor (CF). No significant changes in microtubule (MT) number per cell occurred with chemotactic activation. Significant increases in average MT length per cell occurred upon exposure to gradients or uniform concentrations of CFs. Elongation of MT parallel to the direction of cell migration occurred coincident with shortening of other sets of MTs perpendicular to the direction of cell migration. MT extended radially from a single microtubule organizing center (MTOC) in >99.9% of cells. Following chemotactic activation, the location of the MTOC was observed between nuclear lobes in 65% of fully polarized cells, “posterior” to the nucleus in ⋍34% and “anterior” in less than 1%. Thus alterations of MT array occur coincident with cell orientation or migration in response to chemotactic stimuli. Summary | PDF (11437 kb) |
| Neutrophil granulocytes – Trojan horses for Leishmania major and other intracellular microbes? Trends in Microbiology, Volume 11, Issue 5, 1 May 2003, Pages 210-214 Tamás Laskay, Ger van Zandbergen and Werner Solbach Abstract Polymorphonuclear neutrophil granulocytes (PMNs) possess numerous effector mechanisms to kill ingested pathogens as the first line of defence. However, several microorganisms evade intracellular killing in neutrophils, survive and retain infectivity. There is increasing evidence that several pathogens even multiply within neutrophils. Taking as a prototypic intracellular pathogen, we suggest an evasion strategy that includes the manipulation of PMNs in such a way that the pathogens are able to use the granulocytes as host cells. The ability to survive and maintain infectivity in PMNs subsequently enables these organisms to establish productive infection. These organisms can use granulocytes as Trojan horses before they enter their definitive host cells, the macrophages. Abstract | Full Text | PDF (217 kb) |
Copyright © 1972 The Biophysical Society. All rights reserved.
Biophysical Journal, Volume 12, Issue 8, 1048-1055, 1 August 1972
doi:10.1016/S0006-3495(72)86142-3
Articles
Stephen C. Peterson and Peter B. Noble
An equation describing a two-dimensional random walk with non-uniform step length is derived and applied to a cinephotomicrographic analysis of human granulocyte movement. The method is also applied to a generally recognized chemotactic movement.