microtubules are the important components and function units in cytoskeletal, an d filled with water inside it. In this paper, by using the quantum field theory, we study the interactions between the electric dipole field of water molecules confined within the hollow core of microtubules and the quantized electromagnetic radiation field, and the characteristic of collective electromagnetic radiation raised from water's electric dipoles. In addition, the coupling between the water molecule system confined within microtubules and the surrounding heatbath is discussed.