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Mercatelli D, Bortolotti M, Andresen V, Sulen A, Polito L, Gjertsen BT, Bolognesi A. Early Response to the Plant Toxin Stenodactylin in Acute Myeloid Leukemia Cells Involves Inflammatory and Apoptotic Signaling. Front Pharmacol 2020; 11:630. [PMID: 32457623 PMCID: PMC7226368 DOI: 10.3389/fphar.2020.00630] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 04/21/2020] [Indexed: 12/13/2022] Open
Abstract
Stenodactylin, a highly toxic type 2 ribosome-inactivating protein purified from the caudex of Adenia stenodactyla Harms, is a potential anticancer drug candidate. Previous studies demonstrated that stenodactylin induces apoptosis and necroptosis in treated cells, involving the production of reactive oxygen species. We analyzed the effect of stenodactylin on Raji and Ramos (Human Burkitt’s lymphoma cells) and MOLM-13 (acute myeloid leukemia cells). Moreover, we focused on the early events in MOLM-13 cells that characterize the cellular response to the toxin by whole-genome microarray analysis of gene expression. Treatment with stenodactylin induced the depurination of 28S rRNA within 4 h and increased the phosphorylation of p38 and JNK. A time-dependent activation of caspase 1, 2, 8, 9, 3/7 was also observed. Genome-wide gene expression microarray analysis revealed early changes in the expression of genes involved in the regulation of cell death, inflammation and stress response. After 4 h, a significant increase of transcript level was detectable for ATF3, BTG2, DUSP1, EGR1, and JUN. Increased upstream JUN signaling was also confirmed at protein level. The early response to stenodactylin treatment involves inflammatory and apoptotic signaling compatible with the activation of multiple cell death pathways. Because of the above described properties toward acute myeloid leukemia cells, stenodactylin may be a promising candidate for the design of new immunoconjugates for experimental cancer treatment.
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Affiliation(s)
- Daniele Mercatelli
- Department of Experimental, Diagnostic and Specialty Medicine-DIMES, Alma Mater Studiorum, University of Bologna, Bologna, Italy.,Department of Pharmacy and Biotechnology-FaBiT, Alma Mater Studiorum, University of Bologna, Bologna, Italy
| | - Massimo Bortolotti
- Department of Experimental, Diagnostic and Specialty Medicine-DIMES, Alma Mater Studiorum, University of Bologna, Bologna, Italy
| | - Vibeke Andresen
- Centre of Cancer Biomarkers CCBIO, Department of Clinical Science, University of Bergen, Bergen, Norway.,Hematology Section, Department of Internal Medicine, Haukeland University Hospital, Bergen, Norway
| | - André Sulen
- Centre of Cancer Biomarkers CCBIO, Department of Clinical Science, University of Bergen, Bergen, Norway
| | - Letizia Polito
- Department of Experimental, Diagnostic and Specialty Medicine-DIMES, Alma Mater Studiorum, University of Bologna, Bologna, Italy
| | - Bjørn Tore Gjertsen
- Centre of Cancer Biomarkers CCBIO, Department of Clinical Science, University of Bergen, Bergen, Norway.,Hematology Section, Department of Internal Medicine, Haukeland University Hospital, Bergen, Norway
| | - Andrea Bolognesi
- Department of Experimental, Diagnostic and Specialty Medicine-DIMES, Alma Mater Studiorum, University of Bologna, Bologna, Italy
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