Novel engineered TRAIL-based chimeric protein strongly inhibits tumor growth and bypasses TRAIL resistance
INTERNATIONAL JOURNAL OF CANCER
Authors: Rozga, Piotr; Kloska, Damian; Pawlak, Sebastian; Teska-Kaminska, Malgorzata; Galazka, Marlena; Bukato, Katarzyna; Pieczykolan, Anna; Jaworski, Albert; Molga-Kaczmarska, Anna; Kopacz, Aleksandra; Badyra, Bogna; Kachamakova-Trojanowska, Neli; Zolnierkiewicz, Olga; Targosz-Korecka, Marta; Poleszak, Katarzyna; Szymanik, Michal; Zerek, Bartlomiej; Pieczykolan, Jerzy; Jozkowicz, Alicja; Grochot-Przeczek, Anna
Abstract
Targeting of the TRAIL-DR4/5 pathway was proposed as a promising approach for specific induction of apoptosis in cancer cells. Clinical trials, however, showed inadequate efficiency of TRAIL as a monotherapy. It is a widely held view that the application of multifunctional molecules or combination therapy may lead to substantial improvement. Here, we demonstrate the effectiveness and safety of a novel chimeric protein, AD-O51.4, which is a TRAIL equipped with positively charged VEGFA-derived effector peptides. The study was performed in multiple cancer cell line- and patient-derived xenografts. A pharmacokinetic profile was established in monkeys. AD-O51.4 strongly inhibits tumor growth, even leading to complete long-term tumor remission. Neither mice nor monkeys treated with AD-O51.4 demonstrate symptoms of drug toxicity. AD-O51.4 exhibits a satisfactory half-life in plasma and accumulates preferentially in tumors. The cellular mechanism of AD-O51.4 activity involves both cytotoxic effects in tumor cells and antiangiogenic effects on the endothelium. The presence of DRs in cancer cells is crucial for AD-O51.4-driven apoptosis execution. The TRAIL component of the fusion molecule serves as an apoptosis inducer and a cellular anchor for the effector peptides in TRAIL-sensitive and TRAIL-resistant cancer cells, respectively. The FADD-dependent pathway, however, seems to be not indispensable in death signal transduction; thus, AD-O51.4 is capable of bypassing the refractoriness of TRAIL. AD-O51.4-driven cell death, which exceeds TRAIL activity, is achieved due to the N-terminally fused polypeptide, containing VEGFA-derived effector peptides. The high anticancer efficiency of AD-O51.4 combined with its safety has led to the entry of AD-O51.4 into toxicological studies.
Controlling Cell Death through Post-translational Modifications of DED Proteins
TRENDS IN CELL BIOLOGY
Authors: Seyrek, Kamil; Ivanisenko, Nikita, V; Richter, Max; Hillert, Laura K.; Koenig, Corinna; Lavrik, Inna N.
Abstract
Apoptosis is a form of programmed cell death, deregulation of which occurs in multiple disorders, including neurodegenerative and autoimmune diseases as well as cancer. The formation of a death-inducing signaling complex (DISC) and death effector domain (DED) filaments are critical for initiation of the extrinsic apoptotic pathway. Post-translational modifications (PTMs) of DED-containing DISC components such as FADD, procaspase-8, and c-FLIP comprise an additional level of apoptosis regulation, which is necessary to overcome the threshold for apoptosis induction. In this review we discuss the influence of PTMs of FADD, procaspase-8, and c-FLIP on DED filament assembly and cell death induction, with a focus on the 3D organization of the DED filament.