CD8 production of IL-2 will induce CD8 Tc proliferation and acquisition of cytotoxic effector functions. At the same time Th cells make IL-2. This also holds true for Th cell activation, where these same requirements are a necessity. Once the infected is recognized, the Tc cell will release its effector molecules locally, towards the infected cell. They are stored in secretory vesicles within Tc cells.
Cytotoxins are non-specific toxins.
For this reason, it is preferable that these vesicles be secreted at the junction between the Tc cell and the infected host cell, and not generally into the circulation. Interleukins and Lymphokines are just other terms used for this family of molecules. Cytokine is a broad term used for molecules secreted by immune and non-immune cells that modulate production, activation, and differentiation of effector functions of the immune system. Responder cells absolutely need a specific receptor to bind a specific cytokine. In addition, the same cytokine can have different effects on different target cells.