Abstract
Progesterone and its synthetic analogues act on cells through different types of receptors, affecting proliferation and apoptosis. These compounds exert their effect through the nuclear receptors and the insufficiently studied membrane progesterone receptors (mPRs) belonging to the progestin and adiponectin Q receptor (PAQR) family. We have identified two selective ligands of mPRs that activate only this type of progesterone receptors – 19-hydroxypregn-4-en-20-one (LS-01) and 19-hydroxy-5β-pregn-3-en-20-one (LS-02). The goal of this work is to study the effect of these compounds on proliferation and death of human pancreatic adenocarcinoma cells BxPC3 and involvement of the two kinases (p38 MAPK and JNK) in signaling pathways activated by progestins through mPRs. It was shown that progesterone and the compound LS-01 significantly (p < 0.05) inhibited the BxPC3 cell viability, with JNK serving as a mediator. The identified targets of these two steroids are the genes of the proteins Ki67, cyclin D1, PCNA, and p21. Progesterone and the compound LS-01 significantly (p < 0.05) stimulate DNA fragmentation, enhancing the cell death. The p38 mitogen-activated protein kinase (MAPK) is a key mediator of this process. The BCL2A1 protein gene was identified as a target of both steroids. The compound LS-02 significantly (p < 0.05) alters membrane permeability and changes the exposure of phosphatidylserine on the outer membrane leaflet, also enhancing the cell death. This compound acts on these processes by activating both kinases, JNK and p38 MAPK. The compound LS-02 targets the genes encoding the proteins HRK, caspase 9, and DAPK.
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Abbreviations
- BCL2A1:
-
BCL2 related protein A1
- cyclin D1:
-
type D1 cyclin-dependent kinases activator
- DAPK1:
-
death-associated protein kinase 1
- FAS:
-
Fas cell surface death receptor
- HRK:
-
hara-kiri
- Ki67:
-
marker of proliferation
- mPRs:
-
membrane progesterone receptors
- nPRs:
-
nuclear progesterone receptors
- P4:
-
progesterone
- p21:
-
cyclin-dependent kinase inhibitor 1A
- p27:
-
a cyclin-dependent kinase inhibitor 1B
- PCNA:
-
proliferating cell nuclear antigen
- qPCR:
-
quantitative real-time PCR
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Acknowledgments
The authors express their gratitude to the Center of Collective Use “Genome” of the Engelhard Institute of Molecular Biology (Russian Academy of Sciences) and to I. Yu. Petrushanko for helping with the flow cytometry experiments.
Funding
This work was financially supported by the Russian Foundation for Basic Research (project no. 20-015-00092).
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Goncharov, A.I., Levina, I.S., Shliapina, V.L. et al. Cytotoxic Effects of the Selective Ligands of Membrane Progesterone Receptors in Human Pancreatic Adenocarcinoma Cells BxPC3. Biochemistry Moscow 86, 1446–1460 (2021). https://doi.org/10.1134/S0006297921110080
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DOI: https://doi.org/10.1134/S0006297921110080