Search results
Results from the WOW.Com Content Network
The CD system is commonly used as cell markers in immunophenotyping, allowing cells to be defined based on what molecules are present on their surface. These markers are often used to associate cells with certain immune functions. While using one CD molecule to define populations is uncommon (though a few examples exist), combining markers has ...
Cluster of differentiation (CD) molecules are markers on the cell surface, as recognized by specific sets of antibodies, used to identify the cell type, stage of differentiation and activity of a cell. KIT is an important cell surface marker used to identify certain types of hematopoietic (blood) progenitors in the bone marrow. To be specific ...
In medicine, a biomarker is a measurable indicator of the severity or presence of some disease state. It may be defined as a "cellular, biochemical or molecular alteration in cells, tissues or fluids that can be measured and evaluated to indicate normal biological processes, pathogenic processes, or pharmacological responses to a therapeutic intervention."
Like many cell surface receptors/markers, CD4 is a member of the immunoglobulin superfamily. It has four immunoglobulin domains (D 1 to D 4) that are exposed on the extracellular surface of the cell: D 1 and D 3 resemble immunoglobulin variable (IgV) domains. D 2 and D 4 resemble immunoglobulin constant (IgC) domains.
CD34 is expressed in hematopoietic progenitor cells and endothelial cells of blood vessels. Thus, it has been used as a marker for capillaries and blood vessels. One of the most densely vascular organs is the kidney, wherein networks of capillaries are intertwined with renal tubules.
Each cell membrane can have several kinds of membrane receptors, with varying surface distributions. A single receptor may also be differently distributed at different membrane positions, depending on the sort of membrane and cellular function. Receptors are often clustered on the membrane surface, rather than evenly distributed. [5] [6]
The specific cell-surface markers for Tr1 cells in humans and mice are CD4 + CD49b + LAG-3 + CD226 + from which LAG-3 + and CD49b + are indispensable. [3] LAG-3 is a membrane protein on Tr1 cells that negatively regulates TCR-mediated signal transduction in cells.
Thymocytes are classified into a number of distinct maturational stages based on the expression of cell surface markers. The earliest thymocyte stage is the double negative stage (negative for both CD4 and CD8), which more recently has been better described as Lineage-negative, and which can be divided into four substages.