How do cytokines tell cells what to do? Produced by cells as part of normal cellular activity and/or the result of environmental trigger Bind to receptors on cells Trigger signal transduction pathways Initiate synthesis of new proteinsHow do cytokines tell cells what to do? ◼ Produced by cells as part of normal cellular activity and/or the result of environmental trigger ◼ Bind to receptors on cells ◼ Trigger signal transduction pathways ◼ Initiate synthesis of new proteins