What's the difference between diapedesis and migration?

Diapedesis


Definition:

  • (n.) The passage of the corpuscular elements of the blood from the blood vessels into the surrounding tissues, without rupture of the walls of the blood vessels.

Example Sentences:

  • (1) Thrombospondin (TSP), a 450-kDa trimeric glycoprotein secreted by platelets and endothelial cells at sites of tissue injury or inflammation, may play an important role in polymorphonuclear leukocyte (PMN) adherence to blood vessel walls before diapedesis.
  • (2) Adherence of circulating neutrophils to the microvascular endothelium is the initial step in diapedesis, the process by which leukocytes migrate through blood vessels to accumulate at sites of cutaneous disease or injury.
  • (3) Adherence of PMNs to the endothelium and their subsequent diapedesis and egress to areas of infection are considered early vital events in the inflammatory process.
  • (4) Parietal thrombosis and leukocyte diapedesis were also observed in the aorta.
  • (5) The results of this preliminary study suggest that changes can be found in peripheral blood monocytes which might influence diapedesis and interaction with immune complexes.
  • (6) Intramammary infusion of saline containing .1% glycogen resulted in diapedesis of numerous leukocytes (93% polymorphonuclear leukocytes) into milk.
  • (7) The LTB4 generation following Tx-mimic was correlated (P less than 0.05, r = 0.70) with neutrophil diapedesis.
  • (8) Previously we reported that cultured endothelial cells (ECs) can promote or inhibit polymorphonuclear leukocyte (PMN) diapedesis and albumin permeability in vitro by altering monolayer intercellular integrity (an activity influenced by pretreatment with exogenous amines).
  • (9) At day four lymphocyte diapedesis through the venules becomes apparent.
  • (10) The infusion of prostacyclin prevented the formation of platelet aggregates and platelet diapedesis due to PAF-acether, but the morphological evidence of bronchial constriction was not modified.
  • (11) A model of leukocyte adhesion and invasion whereby activated leukocytes denature extracellular proteins during diapedesis, making them suitable for recognition by beta 2 integrins, is proposed.
  • (12) From the observations of others, it had appeared that the ultimate portal of entry into the central nervous system involved some type of cytolytic process; however, this study illustrates an action of simple diapedesis in which the organisms seek a pathway of least resistance; namely the naturally-occurring pial fenestrations.
  • (13) Early nodal PCV are distinguised from other nodal blood vessels by the presence of lymphocyte diapedesis and several luminal lymphocytes.
  • (14) Granulocyte diapedesis in response to the generation of defined chemotaxins such as leukotriene B4 (LTB4), 12(R)-hydroxyeicosatetraenoic acid [12(R)-HETE], C5a, platelet activating factor and others is a hallmark of the inflammatory process that is thought to contribute to the tissue pathology seen in a number of diseases.
  • (15) These data indicate that surface contact such as would occur during diapedesis and chemotaxis profoundly alters neutrophil behavior by an unknown mechanism and imply that observations made on polymorphonuclear leukocytes in suspension cannot be generalized to polymorphonuclear leukocytes in tissue.
  • (16) In both types of tumour growth this free blood was due to diapedesis of erythrocytes through tips of capillary sprouts which grow when neovascularization (angiogenesis) occurs in response to any suitable (non-neoplastic or neoplastic) stimulus.
  • (17) Thus, endothelial generation of superoxide radicals acts as a trigger mechanism for endothelial dysfunction which is then amplified by neutrophil adherence and diapedesis into the ischemic region enhancing post-reperfusion ischemic injury.
  • (18) It is concluded that exposure to LTB4 per se and the resulting leukocyte diapedesis are not structurally damaging to the vasculature.
  • (19) This study tests whether LTB4 is derived from PMNs and its role in mediating ischemic plasma-induced diapedesis.
  • (20) We examined the in vivo effects of a known phospholipase A2 inhibitor (mepacrine) and the two mast cell active agents (cyproheptadine and reserpine) on lung lavage fluid chemotactic capability, alveolar macrophage (AM) production of chemotactic factor(s), and neutrophil diapedesis.

Migration


Definition:

  • (n.) The act of migrating.

Example Sentences:

  • (1) In addition to their involvement in thrombosis, activated platelets release growth factors, most notably a platelet-derived growth factor (PDGF) which may be the principal mediator of smooth muscle cell migration from the media into the intima and of smooth muscle cell proliferation in the intima as well as of vasoconstriction.
  • (2) During capillary growth when endothelial cells (EC) undergo extensive proliferation and migration and pericytes are scarce, hyaluronic acid (HA) levels are elevated.
  • (3) Major forms of the CV-1 factors migrate between 20 and 24 kilodaltons, while the COS factors migrate between 20 and 28 kilodaltons.
  • (4) Hence the major role of the 14-A arm of carboxybiotin is not to permit a large carboxyl migration but, rather to permit carboxybiotin to traverse the gap which occurs at the interface of three subunits and to insinuate itself between the CoA and keto acid sites.
  • (5) The rate of accumulation was highest late in infection and only the slower migrating form incorporates significant amounts of glucosamine.
  • (6) From this proliferating layer, precursor cells migrate outwards to reach the developing neostriatum in a sequential fashion according to two gradients of histogenesis.
  • (7) Transplanted cells divided in vivo and progressively migrated into the host brain from the site of implantation up to distances of about 1 mm.
  • (8) These results suggest that bPAG is probably synthesized by trophoblast binucleate cells and stored in granules prior to delivery into the maternal circulation after cell migration.
  • (9) Our findings: (1) both forms, LC1 and LC3, migrate in the two species with rather similar electrophoretic constants (both in terms of pI and Mr); (2) the LC2 forms of rabbit and humans exhibit the same Mr but quite different pI values, the rabbit forms being more acidic; (3) the chain LC2Sb is resolved into two spots in both rabbit and humans.
  • (10) The duration of electrophoresis was based on the migration of a marker dye for a predetermined distance.
  • (11) The dmax migrated rapidly toward the surface with increasing field size at 100-cm SSD.
  • (12) A decrease in neutrophil oxidative metabolism and iodination was observed, but there was no effect on neutrophil random migration or ADCC.
  • (13) Locally directed cell migration was observed in a group of cells in 1. which were involved in a process of aggregation, the latter being probably related to precocious formation of organ primordia.
  • (14) However, the variation in samples, even from among individual animals that had survived challenge, was so great that it precludes the use of the macrophage migration technique as a routine standard assay procedure for immunity.
  • (15) The isoenzyme mobility diminished in both tumour chromatin extracts, and the slow migrating gamma isoenzyme exhibited sensitivity to L-cysteine inhibition.
  • (16) The OPL first appears as a thin, discontinuous break in the cytoblast layer that is frequently interrupted by the profiles of migrating neuro- and glioblasts.
  • (17) On the latter, it migrated as a single polypeptide chain with or without reducing agents and had an apparent mol wt of 62,000.
  • (18) Fifteen apparently normal patients who had been cured of cryptococcosis were found, as a group, to have impaired responsiveness to skin testing with cryptococcin and mumps, minimal leukocyte migration inhibition when stimulated with cryptococcin or C. neoformans, but normal group responses to cryptococcin in Cryptococcus-induced lymphocyte transformation.
  • (19) Fc gamma RIII immunoprecipitated from a neutrophil lysate migrated from 40 to 76 Kd, whereas Fc gamma RIII immunoprecipitated from serum from the same donor migrated from 40 to 66 Kd.
  • (20) A greater degree of inhibition of migration was induced by addition of antigen to mononuclear cells from 18- and 24-hour exudate cells in comparison with 6- and 12-hour exudates.

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