FKBIA and TLR2. Our results support a novel mechanism of NF-κB activation via physical interaction of Tat with IκB-α and p65, and may contribute to further insights into the deregulation of the inflammatory response by HIV-1. INTRODUCTION Nuclear factor (NF)-κB transcription factors regulate the transcription of genes that are involved in the immune and inflammatory response (1). The NF-κB family includes RelA/p65, c-Rel, RelB, p50 and p52 t