Pde1b controls cyclic nucleotide signaling in cDC1 and macrophages to regulate immune responses.

Pde1b is essential for immune responses by regulating cyclic nucleotide signaling in cDC1 and macrophages, with its loss impairing bacterial clearance and T cell activation.

• Why it matters: Understanding how cyclic nucleotides are controlled within antigen-presenting cells is crucial because their suppression dampens immune activation, yet the regulatory mechanisms remain unclear.
• What they did: The study used genetic loss-of-function models and Listeria infection to investigate Pde1b's role, revealing that its deficiency elevates cAMP and cGMP levels in cDC1 and macrophages, disrupting immune functions.
• The result: Loss of Pde1b impairs bacterial clearance and T cell expansion, while restoring Pde1b activity could potentially enhance immune responses, highlighting its importance as a cell-specific regulator.