Disitertide (P144) is an inhibitor of TGF-β1. In Vitro: Disitertide (P144) prevents TGF-β1-dependent inhibition of MV1Lu proliferation in vitro and markedly reduces binding of TGF-β1 to its receptors. Disitertide blocks TGF-β1-dependent stimulation of a reporter gene under the control of human α2(I) collagen promoter^[1]. In Vivo: Treatment with Disitertide (P144) at low doses causes a significant inhibition of HSC activation and a marked reduction in liver fibrosis in a rat model of chronic exposure to CCl4. A dose as low as 70 μg of the 15-mer peptide Disitertide, given to rats (300 g body weight) on alternate days, decreases fibrogenesis significantly during chronic exposure to CCl4^[1].