PKAI as a potential target for therapeutic intervention.
We have mapped a molecular mechanism for the impaired T-cell function in HIV infection and common variable immunodeficiency (CVI). Protein kinase A type I (PKAI) has a key role as an inhibitor of immune function in T lymphocytes and is activated following antigen receptor triggering. T cells from patients with HIV infection and CVI have increased activation of PKAI. This inhibits immune function and proliferation of T cells. Selective antagonists that block cAMP action through PKAI improve the immune function of T cells from HIV-infected patients up to 300%. Furthermore, combination of cAMP antagonists with interleukin-2 normalized immune responses of T cells from all patients examined and stimulated immune function of T cells from HIV-infected patients up to 600%. In addition, in vitro experiments indicate that approximately 50% of patients with CVI have a T-cell dysfunction that might benefit from a treatment reversing PKAI hyperactivation. This outlines PKAI as a potentially attractive drug target for immunomodulating therapy in HIV infection, as well as for the treatment of other immunodeficiency disorders such as CVI.
Taskén
K
K
Institute of Medical Biochemistry, University of Oslo, Blindern, Oslo, Norway.
Hansson
V
V
Aukrust
P
P
Frøland
S
S
Skålhegg
B S
BS
Müller
F
F
Tobin
D
D
Vang
T
T
Torgersen
K M
KM
Aandahl
E M
EM