Details

Autor(en) / Beteiligte

• Koga, Tomohiro
• Hedrich, Christian M
• Mizui, Masayuki
• Yoshida, Nobuya
• Otomo, Kotaro
• Lieberman, Linda A
• Rauen, Thomas
• Crispín, José C
• Tsokos, George C

Titel

CaMK4-dependent activation of AKT/mTOR and CREM-α underlies autoimmunity-associated Th17 imbalance

Ist Teil von

• The Journal of clinical investigation, 2014-05, Vol.124 (5), p.2234-2245

Ort / Verlag

United States: American Society for Clinical Investigation

Erscheinungsjahr

2014

Quelle

MEDLINE

Beschreibungen/Notizen

• Tissue inflammation in several autoimmune diseases, including SLE and MS, has been linked to an imbalance of IL-17-producing Th (Th17) cells and Tregs; however, the factors that promote Th17-driven autoimmunity are unclear. Here, we present evidence that the calcium/calmodulin-dependent protein kinase IV (CaMK4) is increased and required during Th17 cell differentiation. Isolation of naive T cells from a murine model of lupus revealed increased levels of CaMK4 following stimulation with Th17-inducing cytokines but not following Treg, Th1, or Th2 induction. Furthermore, naive T cells from mice lacking CaMK4 did not produce IL-17. Genetic or pharmacologic inhibition of CaMK4 decreased the frequency of IL-17-producing T cells and ameliorated EAE and lupus-like disease in murine models. Inhibition of CaMK4 reduced Il17 transcription through decreased activation of the cAMP response element modulator α (CREM-α) and reduced activation of the AKT/mTOR pathway, which is known to enhance Th17 differentiation. Importantly, silencing CaMK4 in T cells from patients with SLE and healthy individuals inhibited Th17 differentiation through reduction of IL17A and IL17F mRNA. Collectively, our results suggest that CaMK4 inhibition has potential as a therapeutic strategy for Th17-driven autoimmune diseases.