Evidence that protein kinase C regulates allosensitized T lymphocyte function

Area of Science:

• Immunology
• Cellular Biology
• Molecular Signaling

Background:

• The role of second messengers in T cell alloactivation remains unclear.
• Intracellular calcium has been identified as a potential T-cell alloactivation marker.
• The involvement of protein kinase C (PKC) in allosensitized T cell function requires investigation.

Purpose of the Study:

• To investigate the role of protein kinase C (PKC) in the proliferation and migration of allosensitized T cells.
• To determine the effects of PKC agonists and antagonists on T cell function in vitro.
• To explore potential therapeutic pathways for modifying T cell function in allograft responses.

Main Methods:

• Utilized a mixed leukocyte culture (MLC) model using C57BL/6 anti-DBA/2J cells.
• Administered PKC agonists (phorbol 12-myristate 13-acetate, mezerein, OAG) and antagonists (phloretin, D-sphingosine).
• Assessed T cell proliferation and in vitro locomotion using a Boyden chamber assay.

Main Results:

• PKC agonists, particularly PMA, significantly stimulated secondary MLC supernatant-induced T cell proliferation (132-200% increase).
• MEZ and OAG also demonstrated stimulatory effects on T cell proliferation (132-152% of control).
• PKC antagonists phloretin and D-sphingosine inhibited proliferation by over 50% and affected T cell locomotion.

Conclusions:

• PKC activation plays a significant role in promoting allosensitized T cell proliferation and locomotion.
• PKC represents a potential molecular pathway for modulating T cell function in the context of allograft responses.
• Targeting PKC could offer novel strategies for managing allograft rejection.