Targeting Membrane HDM-2 by PNC-27 Induces Necrosis in Leukemia Cells But Not in Normal Hematopoietic Cells.
Thadi. Anusha A; Lewis. Lauren L; Goldstein. Eve E; Aggarwal. Anshu A; Khalili. Marian M; Steele. Lindsay L; Polyak. Boris B; Seydafkan. Shabnam S; Bluth. Martin H MH; Ward. Kristine A KA; Styler. Michael M; Campbell. Paul M PM; Pincus. Matthew R MR; Bowne. Wilbur B WB
Key Findings
- Leukemia cell lines (U937, OCI-AML3, HL-60) show high levels of HDM-2 on their outer membranes.
- PNC-27 binds to this membrane HDM-2 and triggers rapid cell death (necrosis) within a few hours.
- Normal hematopoietic (blood‑forming) cells were not harmed by PNC-27 in the experiments.
Practical Outcomes
- The study points to a possible new way to treat leukemia, but it is far from ready for any DIY or self‑experimentation. No dosage, safety, or human data are available, so there are no actionable protocols for biohackers at this stage.
Summary
Scientists found that a short protein called PNC-27 can stick to a molecule (HDM-2) on the surface of certain leukemia cells and punch holes in them, killing the cancer cells while sparing normal blood cells. This was only shown in lab dishes, not in people.
Abstract
Anticancer peptide PNC-27 binds to HDM-2 protein on cancer cell membranes inducing the formation of cytotoxic transmembrane pores. Herein, we investigated HDM-2 membrane expression and the effect of PNC-27 treatment on human non-stem cell acute myelogenous leukemia cell lines: U937, acute monocytic leukemia; OCI-AML3, acute myelomonocytic leukemia and HL60, acute promyelocytic leukemia. We measured cell surface membrane expression of HDM-2 using flow cytometry. Cell viability was assessed using MTT assay while direct cytotoxicity was measured by lactate dehydrogenase (LDH) release and induction of apoptotic markers annexin V and caspase-3. HDM-2 is expressed at high levels in membranes of U937, OCI-AML3 and HL-60 cells. PNC-27 can bind to membrane HDM-2 to induce cell necrosis and LDH release within 4 h. Targeting membrane HDM-2 can be a potential strategy to treat leukemia. PNC-27 targeting membrane HDM-2 demonstrated significant anti-leukemia activity in a variety of leukemic cell lines.
Study Information
pubmed
2020
2020-09-01T00:00:00.000Z
10.21873/anticanres.14488
2
19