Regulation of actin assembly and depolymerization is important for the organization of epithelia. Recent studies have shown that the actin-capping proteins are required to prevent cell extrusion and inappropriate activation of Yorkie (Yki) activity in Drosophila, implicating the importance of actin regulation for epithelial integrity and Yki-dependent tissue growth. However, the role of Twinstar (Tsr), the Drosophila homolog for cofilin/actin depolymerization factor (ADF), in epithelial integrity and Hippo signaling is unknown. Both capping proteins and Tsr are crucial components of actin depolymerization process. Therefore, like capping proteins, Tsr may participate in epithelial integrity and tissue growth. Hence we investigated the consequence of Tsr reduction on epithelial integrity and development in wing imaginal disc, using GAL4-UAS and FRT-FLP methods. We show that reduction of Tsr in wing imaginal disc induces not only F-actin accumulation but also ectopic expression of Wingless (Wg) and Yki target gene expanded (ex). Knockdown of Yki in Tsr-depleted cells reduced the level of ectopic Wg expression. Reduced Tsr also led to downregulation of cell junction proteins and extrusion of affected cells from the basal part of the epithelium. Rho GTPase 1, a known actin modifier protein, was upregulated in Tsr-depleted tissue, supporting the Tsr function in the inhibition of cell extrusion from the epithelium. Tsr is also required for blocking cell death and c-Jun N-terminal kinase (JNK) signaling, as loss of Tsr induced both apoptotic features and upregulation of JNK downstream target genes. Ectopic JNK activation induced caspase activation but did not cause cell extrusion in this case, hence JNK activation is not sufficient condition for invasive cell movement. Further, the invasiveness of Tsr-depleted cells was not suppressed by inhibition of cell death or JNK signaling, and it was enhanced in Tsr knockdown cells with cell death inhibitor P35, indicating a critical role of Tsr in cell migration control. In contrast, Yki upregulation was significantly suppressed by cell death inhibition. Taken together, our data suggest that Tsr is required for cell survival and tissue growth by regulating JNK and Yki signaling while maintaining the epithelial integrity by controlling cell junctions. This study provides an insight into potential roles of ADF/cofilin in invasive cell migration and tumor suppression in higher animals.