How are memory cells produced?
A child is given a measles vaccination. Explain how the child becomes immune to measles.
I have answered this question below -
"This is a case of "artificial active immunity." The child is given an injection of the antigen (measles virus). His or her body produces the antibodies; memory T cells "remember" the antigen and immediately respond the next time the antigen appears. The immune system's response is so fast that the virus never gets a chance to develop."
I have been told by my teacher to add the answer to the following question to my answer above -
Q) How are memory cells produced?
Please answer the question above?
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In response to an infecting agent (in this case measles) cells which have never been exposed to the virus respond by going into massive production. The majority of these cells then begin to produce antibodies that fight against the infectious agent. The rest of the cells continue to survive as “memory cells”, and these cells recognize the same infectious agent for years to come. These cells fight against the recognized agent or pathogen, and they are what prevent the infection from reoccurring. This is why vaccinations offer greater immunity to diseases. Hopefully this is the information you needed.
Immune memory involves specialized functional types of lymphocytes T and Bm, called memory cells .
B memory lymphocyte antigen receptors have higher binding antigens affinity and therefore are more effective in capturing small amounts of antigens and presenting them faster.
Memory B cell generation mechanism is hypothetical. One theory believes that both plasma cells (antibody producing) and memory B cells are derived from the same B lymphocyte precursors.
Cells resulting from successive divisions, triggered by antigenic stimulation evolve differently: some are differentiated plasma cells, others remain small lymphocytes, returning to the G0 state and become memory lymphocytes. Descendants of stimulated clone to evolve towards plasma cells or memory cell, compared with the influences it receives from accessory cells or Th cells.
After another theory, the memory cells and plasma cells are comming from different B cells. B lymphocytes seem to be preprogrammed to become plasma cells or memory lymphocytes before antigen exposure.
Secondary immune response is characterized by increasing antibody affinity.
Memory Th cells are probably generated in the cortex of lymph nodes, but the mechanism is unknown. The memory T cells mechanism was proposed after the model of contact dermatitis induction, a delayed hypersensitivity reaction, mediated by CD4 cells.
The immune system of the body is monitered with the help of white blood cells called lymphocytes,which circulate between blood and the lymph system.The lymphocytes are of two types: B cells and T cells. After the human body has recovered from a disease, B-cells produce memory cells that attack the disease causing organism if it invades again. This second response is much quicker than the first, thus preventing symptoms of the disease from occurring.The B lymphocyte cells searches for antigen matching its receptors. If it finds such antigen it connects to it, and inside the B cell a triggering signal is set off. The B cell now needs proteins produced by helper T cells to become fully activated. When this happens, the B cell starts to divide to produce clones of itself. During this process, two new cell types are created, plasma cells and B memory cells
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