Full form of CD is cluster of designation or cluster of differentiation.
In short, CD3 is a transmembrane protein found on T lymphocytes that functions in signal transduction following antigen stimulation of the T cell receptor.
executable cell
CD4 is a glycoprotien expressed on the surface of Helper T Cell
CD4+ or T-helper cell.
CD4+ or T=helper cell.
CD4
CD4 is a surface receptor expressed by helper T lymphocytes, known as CD4+ T cells. Its purpose is to stablize the interaction between the T cell receptor (on the T cell) and an antigen-bearing MHC Class II molecule (on an antigen presenting cell). Under the right circumstances, this interaction activates CD4+ T cells that recognize an invading pathogen. Activated CD4+ T cells do many things, and are required for a robust adaptive immune response.
A low CD4 cell count typically indicates a weakened immune system, often due to conditions like HIV or other infections. CD4 cells play a critical role in the immune response, so a low count can make the body more vulnerable to opportunistic infections and illnesses. Monitoring CD4 cell counts is important in managing conditions that affect the immune system.
when erythrocytes bind to CD3 receptors present on the surface of T-cell it will give rose like appearance to T-cell this process is called as T-cell rosetting
The CD stands for 'cluster of differentiation' and is way to categorise some of the cells that are part of your immune system. CD4 is T-cell and is the most important immune marker for monitoring HIV.
The CD4 count is the result of the most important test used to monitor HIV. The 'absolute' count is the same as the CD4 count. This is the result you get back from your doctor. The term 'absolute' is used to differentiate it from CD4 percentage (CD4%) which can also be used for clinical management.
The role of the CD4 receptors in HIV is so that the virus fuses with the T helper cells.