[1-9-NαC]-crourorb A1 isolated from Croton urucurana latex induces G2/M cell cycle arrest and apoptosis in human hepatocarcinoma cells.
[1-9-NαC]-crourorb A1 is a cyclic peptide isolated from Croton urucurana Baillon latex, found in midwestern Brazil, that has been shown to exert cytotoxic effects against a panel of cancer cell lines. However, the underlying mechanisms responsible for the crourorb A1-induced cytotoxicity in cancer cells remain unknown. In this study, the effects of crourorb A1 on the viability, apoptosis, cell cycle and migration of Huh-7 (human hepatocarcinoma) cells were investigated. We evaluated the viability of Huh-7 cells treated with crourorb A1 in 2D and 3D collagen cultures and found that cells in 3D culture exhibited increased resistance to crourorb A1 compared to cells in 2D culture (IC50: 62μg/ml versus 35.75μg/ml). Crourorb A1 treatment decreases the viability of Huh-7 cells in a dose- and time-dependent manner and is associated with the induction of apoptosis, in the absence of necrotic cells, through the activation of caspase-3/7 and increased expression of the pro-apoptotic proteins Bak, Bid, Bax, Puma, Bim, and Bad. The effects of crourorb A1 are also associated with G2/M phase cell cycle arrest and increases in cyclin-dependent kinase (CDK1) and cyclin B1 expression. A significant reduction in Huh-7 cell migration induced by crourorb A1 was also observed in the presence of mitomycin C. Finally, we showed that the JNK/MAP pathway, but not ERK signaling, is involved in crourorb A1-induced hepatocarcinoma cell mortality.
Institut National de la Santé et de la Recherche Médicale (Inserm), UMR1085 Institut de Recherche sur la Santé l'Environnement et le Travail (IRSET); University of Rennes 1, SFR Biosit, Rennes, France; Instituto de Química, Universidade Federal de Mato Grosso do Sul, Campo Grande, MS, Brazil; Centro de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso do Sul, Campo Grande, Brazil. Electronic address: priscila.mcbacani@gmail.com.
Priscila
P
de Matos Cândido-Bacani
Institut National de la Santé et de la Recherche Médicale (Inserm), UMR1085 Institut de Recherche sur la Santé l'Environnement et le Travail (IRSET); University of Rennes 1, SFR Biosit, Rennes, France.
Frédéric
F
Ezan
Instituto de Química, Universidade Federal de Mato Grosso do Sul, Campo Grande, MS, Brazil.
Patrícia
P
de Oliveira Figueiredo
Centro de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso do Sul, Campo Grande, Brazil.
Maria de Fátima Cepa
MFC
Matos
Instituto de Química, Universidade Federal de Mato Grosso do Sul, Campo Grande, MS, Brazil.
Fernanda
F
Rodrigues Garcez
Instituto de Química, Universidade Federal de Mato Grosso do Sul, Campo Grande, MS, Brazil.
Walmir
W
Silva Garcez
Institut National de la Santé et de la Recherche Médicale (Inserm), UMR1085 Institut de Recherche sur la Santé l'Environnement et le Travail (IRSET); University of Rennes 1, SFR Biosit, Rennes, France. Electronic address: georges.baffet@univ-rennes1.fr.
Georges
G
Baffet
D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D051017:Apoptosis Regulatory Proteins / Q000096:biosynthesis; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D029802:Croton / Q000737:chemistry*; D059565:G2 Phase Cell Cycle Checkpoints / Q000187:drug effects*; D006801:Humans; D007840:Latex / Q000737:chemistry*; D059566:M Phase Cell Cycle Checkpoints / Q000187:drug effects*; D020935:MAP Kinase Signaling System / Q000187:drug effects; D010456:Peptides, Cyclic / Q000302:isolation & purification / Q000494:pharmacology*
D000972:Antineoplastic Agents, Phytogenic; D051017:Apoptosis Regulatory Proteins; D007840:Latex; D010456:Peptides, Cyclic
Apoptosis; Cell cycle arrest; Croton urucurana; Huh-7 cells; Peptide