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Acute Inflammation
vascular events, cellular events, inflammatory mediators
| Term | Definition |
|---|---|
| Sequence of vascular events | transient vasoconstriction persistent progressive vasodilatation increased local hydrostatic pressure slowing or stasis |
| triple response | red line flare wheal |
| Starling's hypothesis | outward inward movements |
| mediators in vascular events | interleukins TNF- alpha histamines bradykinins VEGF |
| PHASES OF CELLULAR EVENTS | exudation of leucocytes phagocytosis |
| changes in migration of leucocytes are: | margination and pavementing rolling and adhesion emigration chemotaxis |
| mediators in migration of leucocytes are: | selectins, integrins , immunoglobulins, leukotrienes, cytokines, complement system components |
| different types of selectins and their roles | E- SELECTIN : endothelial selectins (rolling) P- SELECTIN : platelet selectins (rolling and adhesion) L-SELECTINS: Lymphocytes (homing of circulating lymphocytes to endo. cells in lymph nodes) |
| different immunoglobulin and their roles | ICAM-1 : intercellular adhesion molecule VCAM-1: vascular cell adhesion molecule PECAM - 1 : platelet endothelial cell adhesion molecule |
| define DIAPEDESIS | escape of RBC'S through endothelial gaps between endothelial cells is known as DIAPEDESIS. |
| name few CHEMOTACTIC AGENTS | leukotrienes ( LT- B4) cytokines (IL- 8) components of complement system(C5a, C3a) soluble bacterial products |
| define phagocytosis | process of engulfment of solid particulate material by cells. |
| 2 types of phagocytic cells | 1. PMNs 2. macrophages |
| steps in phagocytosis | 1. recognition and attachment 2. engulfment 3. killing and degradation |
| name the proteolytic enzymes involved in the process of phagocytosis | lysozyme, protese, collagenase, elastase, lipase |
| what are OPSONINS? | specific protein coated microorganisms |
| opsonisation? | a bond established between the cell bacteria and cell membrane of phagocytic cell. |
| name the opsonins which are present during phagocytosis | IgG OPSONIN C3bOPSONIN LECTIN |
| name the locomotive agent during engulfment | cytoplasmic pseudopods |
| MPO expand?? | Myeloperoxidase |
| intracellular mechanism in phagocytosis include: | oxygen reduced to superoxide ion ( in the presence of NADPH - oxidase) superoxide converted to H2O2 ( in the presence of MPO) hypophalous acid formed |
| describe HABER-WEISS reaction and FENTON reaction | H2O2----- OH- (in the presence of O2') H2O2-------------- OH- (in the presence of Fe++) |
| name the free radical in non - oxidative bactericidal mechanism | NITRIC OXIDE |
| Name the inflammatory mediators | histamine prostaglandins and leukotrienes cytokines complement proteins kinins |
| name an Arachnoid acid metabolite for vasoconstriction | THROMBOXANE A2 |