Monday, April 8, 2019

T cell memory cells

The notion that there are 3 zones the immune system identifies is also supported by memory cells.  B cells which have been educated to know the outside of cells can create B memory cells for antigens it doesn't recognize.  The T cells which have been educated for internal antigens must also create memory cells but since there are two internal zones: the cytosol zone and then the nuclear/mito zone and these zones are fought differently two types of T memory cells emerge.

Peripheral tissues have Tissue Resident memory cells (TRM) cd103
which are the cd8 memory cells that  can quickly secrete Granzyme B become CTL cells
they are responsible for mitochondrial or nuclear antigen recognition

The lymph organs have the Central memory T cells (CMT ) cd44
which are the cd4 memory cells which quickly secrete il-2
they are responsible for the cytosol antigen recognition

The traveling memory T cells can be cd8 or cd4 moving between the tissues and the lymphs. They produce IFNgamma for inside antigens or il-4/il-5 for outside antigens.


This is the logical hypothesis but is there evidence?

il-2 would differentiate CTL with fas and TH1 ?

cd4 not cd8 T cell proliferation altered by anti-cd44
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1782945/

Tissue resident T cells TRM
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5879098/

Il-2 and T memory cells
http://jem.rupress.org/content/204/3/547

il-2 or il-12 can differentiate TH1 cells
http://www.jimmunol.org/content/170/2/735

CD4 Th1 differentiation and memory cells

When there are cytosol infections the CTL cells express Fas.

example: the flu which is a cytosolic virus triggers FasL expression in infected cells
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073994/

Possible?

Tcm and Leishmania
https://www.ncbi.nlm.nih.gov/pubmed/15448686?dopt=Abstract

Leishmania parasite in cytosol of host
https://genomebiology.biomedcentral.com/articles/10.1186/gb-2008-9-2-r35

nuclear viruses EBV and CMV with Tissue resident memory cells
https://www.ncbi.nlm.nih.gov/pubmed/27540722

Are central memory cells from the T cells in the follicular position?



Although B And T memory cells are always produced each pathway has a primary memory path. Nuclear antigens would have tissue resident memory T cells.  Cytosol antigens would have central memory T cells.  Outer antigens would have B memory cells. This is based on the size of proliferation.


Review of Antibody production hypothesis in the lymph node/spleen.



No comments:

Post a Comment