Precise control of the level of protein expression in cells can facilitate functional studies providing information on the role of given proteins. In this thesis, I describe the generation of tetracycline-inducible pancreatic cancer cells and the subsequent use of these in the functional characterisation of an actin capping protein, CapG. Such cells were obtained in three pancreatic cancer cell lines, Panc-I, Suit-2 and MiaPaCa-2 cells through consecutive transfections with two plasmid constructs. The first of these harboured a second-generation reverse tetracycline-controlled transactivator protein (rtTA) whilst the second, contained the gene of interest (CapG or luciferase) under the control of a tetracycline response promoter element (pTRE). Suit-2 derived tetracycline inducible clones, along with stable doxycycline-inducible hepatoma cell lines, were used to study the effect of modulating CapG expression on cell motility. Here I report that stable introduction of a pTRE2hygCapG construct into two doxycycline-inducible clones derived from Suit-2 cells, Suit-2 ptet1I and Suit-2 ptet29 clones resulted in a dose and time-dependent increase of CapG expression in response to doxycycline. Moreover, doxycycline-mediated upregulation of CapG expression led to a significant increase in the wound healing capacity of Suit-2 ptet29 cells. The expression of a related actin binding and cell motility protein, gelsolin was also determined. Immunostaining of benign (n=24 patients) and malignant (n=68 patients) pancreatic ductal cells revealed higher gelsolin expression in the malignant state (P