RacG Regulates Morphology, Phagocytosis, and Chemotaxis

Calpain regulates neutrophil chemotaxis.

Cell polarization is required for directed cell migration. We investigated the role of the calcium-dependent protease calpain during neutrophil chemotaxis and found that calpain inhibition induced neutrophil adhesion, polarization, and rapid chemokinesis in the absence of exogenous activators. Resting neutrophils display constitutive calpain activity with mu-calpain being the predominant active...

S100A4 Regulates Macrophage Chemotaxis

S100A4, a member of the S100 family of Ca(2+)-binding proteins, is directly involved in tumor metastasis. In addition to its expression in tumor cells, S100A4 is expressed in normal cells and tissues, including fibroblasts and cells of the immune system. To examine the contribution of S100A4 to normal physiology, we established S100A4-deficient mice by gene targeting. Homozygous S100A4(-/-) mic...

MicroRNA deregulation and chemotaxis and phagocytosis impairment in Alzheimer's disease

INTRODUCTION Mononuclear phagocytes play a critical role during Alzheimer's disease (AD) pathogenesis due to their contribution to innate immune responses and amyloid beta (Aβ) clearance mechanisms. METHODS Blood-derived monocytes (BDMs) and monocyte-derived macrophages (MDMs) were isolated from blood of AD, mild cognitive impairment (MCI) patients, and age-matched healthy controls for molecu...

Is Independent of Coronin 1 Chemotaxis and Phagocytosis in Neutrophils

Phagocytosis-induced modulation of human neutrophil chemotaxis receptors.

We investigated the effect of a major physiologic event, phagocytosis. on the ability of human neutrophils (PMN) to bind the synthetic chemotactic peptide, 3H-formyl-methionyl-leucyl-phenylalanine (3H-FMLP). We found that both latex and opsonized zymosan (OPZ) particles caused dosedependent suppression of 3H-FMLP binding and abolition of 3H-FMLP binding with concentrations of OPZ greater than 2...