Protocol for immunostaining of non-adherent cells and cellular structures using centrifugal filter devices

Immunostaining of non-adherent cells can be technically challenging due to the difficulty of efficiently exchanging solutions, a crucial process during immunostaining. Here, we present a protocol that utilizes centrifugal filter devices for immunostaining of non-adherent cells. We describe instructions for simple and efficient solution exchanges during the staining procedure. We also illustrate an application for staining isolated organelles, such as centrosomes. Overall, this protocol provides a practical technique for immunostaining a wide variety of cell types and cellular structures.