Development of a peptide drug restoring AMPK and adipose tissue functionality in cancer cachexia

Cancer cachexia is a severe systemic wasting disease that negatively affects quality of life and survival in patients with cancer. To date, treating cancer cachexia is still a major unmet clinical need. We recently discovered the destabilization of the AMPK complex in adipose tissue as a key event in cachexia-related adipose tissue dysfunction and developed an AAV-based approach to prevent AMPK degradation and prolong cachexia-free survival. Here, we show the development and optimization of a prototypic peptide, Pen-X-ACIP, where the AMPK stabilizing peptide ACIP is fused to the cell-penetrating peptide moiety penetratin via a propargylic glycine linker to enable late-stage functionalization using click chemistry. Pen-X-ACIP was efficiently taken up by adipocytes, inhibited lipolysis and restored AMPK signaling. Tissue uptake assays showed a favorable uptake profile into adipose tissue upon intraperitoneal injection. Systemic delivery of Pen-X-ACIP into tumor-bearing animals prevented the progression of cancer cachexia without affecting tumor growth, and preserved body weight and adipose tissue mass with no discernable side effects in other peripheral organs, thereby achieving proof-of-concept. As Pen-X-ACIP also exerted its anti-lipolytic activity in human adipocytes, it now provides a promising platform for further (pre)clinical development towards a novel, first-in-class approach against cancer cachexia. To obtain a systemic overview of the genes regulated by Pen-X-ACIP in aWAT, we performed RNA sequencing in aWAT of tumor bearing mice treated with either Pen-X-ACIP or its scrambled control. (n=4 in each group)