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A 33-year-old member asked:

what are antigens?

2 doctor answers2 doctors weighed in
Dr. Ed Friedlander
Pathology 44 years experience
Parts of molecules: Anything that one creature's immune system recognizes (rightly or wrongly) as foreign and reacts against can be considered an antigen. Usually these are sequences within proteins. We pathologists use antibodies against normal components of human tissue made by other animals to tell what's in cells we are examining to tell what they are; blood bankers must choose donor units with the right antigens.
Dr. Payam Rafat
Podiatry 22 years experience
Antigens are...: An antigen is any substance that causes your immune system to produce antibodies against it. It may be a foreign substance from the environment such as bacteria, viruses, pollen or chemicals. An antigen may also be formed within the body, as with bacterial toxins.

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A 23-year-old member asked:

Are antigens and t-cells related?

2 doctor answers3 doctors weighed in
Dr. Steven Machtinger
Allergy and Immunology 44 years experience
T cells use antigens: Antigens are parts of large molecules, usually proteins but occasionally carbohydrates, that your immune system samples to see if they are part of your body or foreign. If foreign your immune system will try to cleanse your body of this stuff. Dendritic cells process and present antigens to t cells that in turn direct the body's immune response against the antigen.
A 39-year-old member asked:

What is human leukocyte antigens (hla) ?

1 doctor answer6 doctors weighed in
Dr. Joseph Woods
Pathology 28 years experience
Tissue antigens.: The human leukocyte antigen (hla) system is the name of the major histocompatibility complex (mhc) in humans, which contains genes related to immune system function in humans. This group of genes resides on chromosome 6 and encodes cell-surface antigen-presenting proteins. They are important in disease defense and can be the cause of organ transplant rejections, hence tissue typing.
A 35-year-old member asked:

Triple antigen prevents which diseases ?

1 doctor answer2 doctors weighed in
Dr. Susan Rhoads
Family Medicine 38 years experience
Depends: This terminology is used more outside the US and means the combination vaccine against diptheria, tetanus and whooping cough (pertussis), given in a series of scheduled doses, followed by boosters. There is a triple antigen Hepatitis B vaccine (Hepacare) but this is not used in the US. I don't know which countries offer it or even if it is still being offered.
Lebanon
A 26-year-old female asked:

What is Antigen-specific immunotherapy?

1 doctor answer1 doctor weighed in
Dr. John Chiu
Allergy and Immunology 57 years experience
Specific allergens: If you are referring to allergy treatment, then this simply means that you are given extracts containing the specific allergens you are sensitized to. On the other hand, allergic people are usually less likely to have autoimmune diseases like rheumatoid arthritis which you appear to suffer. Thus you will need to tell us what disease condition this treatment is intended for.
A female asked:

How antibody kill an antigen?

2 doctor answers7 doctors weighed in
Dr. John Chiu
Allergy and Immunology 57 years experience
They don't usually: Antibody does not usually kill an antigen but binds it. The attachment may then, under certain circumstances , triggers the release of certain mediators or the influx of body cells (cytotoxic lymphocytes, macrophage etc) to do the job of killing. This is a very simplistic answer to a complex question however.

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Last updated Feb 8, 2017

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