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Chen L, Gao T, Zhou P, Xia W, Yao H, Xu S, Xu J. Recent advances of vacuolar protein-sorting 34 inhibitors targeting autophagy. Bioorg Chem 2024; 143:107039. [PMID: 38134519 DOI: 10.1016/j.bioorg.2023.107039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 11/21/2023] [Accepted: 12/15/2023] [Indexed: 12/24/2023]
Abstract
Autophagy is a ubiquitous pathological/physiological antioxidant cellular reaction in eukaryotic cells. Vacuolar protein sorting 34 (Vps34 or PIK3C3), which plays a crucial role in autophagy, has received much attention. As the only Class III phosphatidylinositol-3 kinase in mammals, Vps34 participates in vesicular transport, nutrient signaling and autophagy. Dysfunctionality of Vps34 induces carcinogenesis, and abnormal autophagy mediated by dysfunction of Vps34 is closely related to the pathological progression of various human diseases, which makes Vps34 a novel target for tumor immunotherapy. In this review, we summarize the molecular mechanisms underlying macroautophagy, and further discuss the structure-activity relationship of Vps34 inhibitors that have been reported in the past decade as well as their potential roles in anticancer immunotherapy to better understand the antitumor mechanism underlying the effects of these inhibitors.
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Affiliation(s)
- Long Chen
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009, PR China
| | - Tian Gao
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009, PR China
| | - Pijun Zhou
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009, PR China
| | - Wenxuan Xia
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009, PR China
| | - Hong Yao
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009, PR China.
| | - Shengtao Xu
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009, PR China; Shenzhen Research Institute of China Pharmaceutical University, Nanshan District, Shenzhen 518052, PR China.
| | - Jinyi Xu
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009, PR China; Shenzhen Research Institute of China Pharmaceutical University, Nanshan District, Shenzhen 518052, PR China.
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Wang Q, Wang Y, Li S, Shi J. PACAP-Sirtuin3 alleviates cognitive impairment through autophagy in Alzheimer's disease. Alzheimers Res Ther 2023; 15:184. [PMID: 37891608 PMCID: PMC10605376 DOI: 10.1186/s13195-023-01334-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 10/17/2023] [Indexed: 10/29/2023]
Abstract
BACKGROUND Autophagy is vital in the pathogenesis of neurodegeneration. Thus far, no studies have specifically investigated the relationship between pituitary adenylate cyclase-activating polypeptide (PACAP) and autophagy, particularly in the context of Alzheimer's disease (AD). This study used in vitro and in vivo models, along with clinical samples, to explore interactions between PACAP and autophagy in AD. METHODS AD model mice were administered 6 μl of 0.1 mg/ml PACAP liquid intranasally for 4 weeks, then subjected to behavioral analyses to assess the benefits of PACAP treatment. The underlying mechanisms of PACAP-induced effects were investigated by methods including real-time quantitative polymerase chain reaction, RNA sequencing, immunofluorescence, and western blotting. Exosomes were extracted from human serum and subjected to enzyme-linked immunosorbent assays to examine autophagy pathways. The clinical and therapeutic implications of PACAP and autophagy were extensively investigated throughout the experiment. RESULTS Impaired autophagy was a critical step in amyloid β (Aβ) and Tau deposition; PACAP enhanced autophagy and attenuated cognitive impairment. RNA sequencing revealed three pathways that may be involved in AD progression: PI3K-AKT, mTOR, and AMPK. In vivo and in vitro studies showed that sirtuin3 knockdown diminished the ability of PACAP to restore normal autophagy function, resulting in phagocytosis dysregulation and the accumulation of pTau, Tau, and Aβ. Additionally, the autophagic biomarker MAP1LC3 demonstrated a positive association with PACAP in human serum. CONCLUSIONS PACAP reverses AD-induced cognitive impairment through autophagy, using sirtuin3 as a key mediator. MAP1LC3 has a positive relationship with PACAP in humans. These findings provide insights regarding potential uses of intranasal PACAP and sirtuin3 agonists in AD treatment. TRIAL REGISTRATION NCT04320368.
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Affiliation(s)
- Qing Wang
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, No. 119, South 4Th Ring West Road, Fengtai District, Beijing, 100070, China
- China National Clinical Research Center for Neurological Diseases, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Yue Wang
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, No. 119, South 4Th Ring West Road, Fengtai District, Beijing, 100070, China
- China National Clinical Research Center for Neurological Diseases, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Shiping Li
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, No. 119, South 4Th Ring West Road, Fengtai District, Beijing, 100070, China.
- China National Clinical Research Center for Neurological Diseases, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
| | - Jiong Shi
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, No. 119, South 4Th Ring West Road, Fengtai District, Beijing, 100070, China.
- China National Clinical Research Center for Neurological Diseases, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
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Wang J, Khan SU, Cao P, Chen X, Wang F, Zou D, Li H, Zhao H, Xu K, Jiao D, Yang C, Zhu F, Zhang Y, Su Y, Cheng W, Jia B, Qing Y, Jamal MA, Zhao HY, Wei HJ. Construction of PIK3C3 Transgenic Pig and Its Pathogenesis of Liver Damage. Life (Basel) 2022; 12:630. [PMID: 35629298 PMCID: PMC9146193 DOI: 10.3390/life12050630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/26/2022] [Accepted: 04/08/2022] [Indexed: 11/20/2022] Open
Abstract
As a member of the PIKs family, PIK3C3 participates in autophagy and plays a central role in liver function. Several studies demonstrated that the complete suppression of PIK3C3 in mammals can cause hepatomegaly and hepatosteatosis. However, the function of PIK3C3 overexpression on the liver and other organs is still unknown. In this study, we successfully generated PIK3C3 transgenic pigs through somatic cell nuclear transfer (SCNT) by designing a specific vector for the overexpression of PIK3C3. Plasmid identification was performed through enzyme digestion and transfected into the fetal fibroblasts derived from Diannan miniature pigs. After 2 weeks of culturing, six positive colonies obtained from a total of 14 cell colonies were identified through PCR. One positive cell line was selected as the donor cell line for SCNT for the construction of PIK3C3transgenic pigs. Thirty single blastocysts were collected and identified as PIK3C3 transgenic-positive blastocysts. Two surrogates became pregnant after transferring the reconstructed embryos into four surrogates. Fetal fibroblasts of PIK3C3-positive fetuses identified through PCR were used as donor cells for SCNT to generate PIK3C3 transgenic pigs. To further explore the function of PIK3C3 overexpression, genotyping and phenotyping of the fetuses and piglets obtained were performed by PCR, immunohistochemical, HE, and apoptosis staining. The results showed that inflammatory infiltration and vacuolar formation in hepatocytes and apoptotic cells, and the mRNA expression of NF-κB, TGF-β1, TLR4, TNF-α, and IL-6 significantly increased in the livers of PIK3C3 transgenic pigs when compared with wild-type (WT) pigs. Immunofluorescence staining showed that LC3B and LAMP-1-positive cells increased in the livers of PIK3C3 transgenic pigs. In the EBSS-induced autophagy of the porcine fibroblast cells (PFCs), the accumulated LC3II protein was cleared faster in PIK3C3 transgenic (PFCs) thanWT (PFCs). In conclusion, PIK3C3 overexpression promoted autophagy in the liver and associated molecular mechanisms related to the activation of ULK1, AMBR1, DRAM1, and MTOR, causing liver damage in pigs. Therefore, the construction of PIK3C3 transgenic pigs may provide a new experimental animal resource for liver diseases.
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Affiliation(s)
- Jing Wang
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
| | - Sami Ullah Khan
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
| | - Pan Cao
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming 650201, China
| | - Xi Chen
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
| | - Fengchong Wang
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Di Zou
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming 650201, China
| | - Honghui Li
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
| | - Heng Zhao
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Kaixiang Xu
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
| | - Deling Jiao
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
| | - Chang Yang
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Feiyan Zhu
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Yaxuan Zhang
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Yanhua Su
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Wenmin Cheng
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
| | - Baoyu Jia
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Yubo Qing
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Muhammad Ameen Jamal
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
| | - Hong-Ye Zhao
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming 650201, China
| | - Hong-Jiang Wei
- Key Laboratory for Porcine Gene Editing and Xenotransplantation in Yunnan Province, Kunming 650201, China; (J.W.); (S.U.K.); (P.C.); (X.C.); (F.W.); (D.Z.); (H.L.); (H.Z.); (K.X.); (D.J.); (C.Y.); (F.Z.); (Y.Z.); (Y.S.); (W.C.); (B.J.); (Y.Q.); (M.A.J.)
- Xenotransplantation Research Engineering Center in Yunnan Province, Yunnan Agricultural University, Kunming 650201, China
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming 650201, China
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Class III PI3K Biology. Curr Top Microbiol Immunol 2022; 436:69-93. [DOI: 10.1007/978-3-031-06566-8_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Altamura C, Greco MR, Carratù MR, Cardone RA, Desaphy JF. Emerging Roles for Ion Channels in Ovarian Cancer: Pathomechanisms and Pharmacological Treatment. Cancers (Basel) 2021; 13:668. [PMID: 33562306 PMCID: PMC7914442 DOI: 10.3390/cancers13040668] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 01/21/2021] [Accepted: 02/04/2021] [Indexed: 12/20/2022] Open
Abstract
Ovarian cancer (OC) is the deadliest gynecologic cancer, due to late diagnosis, development of platinum resistance, and inadequate alternative therapy. It has been demonstrated that membrane ion channels play important roles in cancer processes, including cell proliferation, apoptosis, motility, and invasion. Here, we review the contribution of ion channels in the development and progression of OC, evaluating their potential in clinical management. Increased expression of voltage-gated and epithelial sodium channels has been detected in OC cells and tissues and shown to be involved in cancer proliferation and invasion. Potassium and calcium channels have been found to play a critical role in the control of cell cycle and in the resistance to apoptosis, promoting tumor growth and recurrence. Overexpression of chloride and transient receptor potential channels was found both in vitro and in vivo, supporting their contribution to OC. Furthermore, ion channels have been shown to influence the sensitivity of OC cells to neoplastic drugs, suggesting a critical role in chemotherapy resistance. The study of ion channels expression and function in OC can improve our understanding of pathophysiology and pave the way for identifying ion channels as potential targets for tumor diagnosis and treatment.
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Affiliation(s)
- Concetta Altamura
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (M.R.G.); (M.R.C.); (J.-F.D.)
| | - Maria Raffaella Greco
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (M.R.G.); (M.R.C.); (J.-F.D.)
- Department of Biosciences, Biotechnologies, and Biopharmaceutics, University of Bari Aldo Moro, 70125 Bari, Italy;
| | - Maria Rosaria Carratù
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (M.R.G.); (M.R.C.); (J.-F.D.)
| | - Rosa Angela Cardone
- Department of Biosciences, Biotechnologies, and Biopharmaceutics, University of Bari Aldo Moro, 70125 Bari, Italy;
| | - Jean-François Desaphy
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (M.R.G.); (M.R.C.); (J.-F.D.)
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Kouba S, Ouldamer L, Garcia C, Fontaine D, Chantome A, Vandier C, Goupille C, Potier-Cartereau M. Lipid metabolism and Calcium signaling in epithelial ovarian cancer. Cell Calcium 2019; 81:38-50. [PMID: 31200184 DOI: 10.1016/j.ceca.2019.06.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 06/03/2019] [Accepted: 06/04/2019] [Indexed: 02/06/2023]
Abstract
Epithelial Ovarian cancer (EOC) is the deadliest gynecologic malignancy and represents the fifth leading cause of all cancer-related deaths in women. The majority of patients are diagnosed at an advanced stage of the disease that has spread beyond the ovaries to the peritoneum or to distant organs (stage FIGO III-IV) with a 5-year overall survival of about 29%. Consequently, it is necessary to understand the pathogenesis of this disease. Among the factors that contribute to cancer development, lipids and ion channels have been described to be associated to cancerous diseases particularly in breast, colorectal and prostate cancers. Here, we reviewed the literature data to determine how lipids or lipid metabolites may influence EOC risk or progression. We also highlighted the role and the expression of the calcium (Ca2+) and calcium-activated potassium (KCa) channels in EOC and how lipids might regulate them. Although lipids and some subclasses of nutritional lipids may be associated to EOC risk, lipid metabolism of LPA (lysophosphatidic acid) and AA (arachidonic acid) emerges as an important signaling network in EOC. Clinical data showed that they are found at high concentrations in EOC patients and in vitro and in vivo studies referred to them as triggers of the Ca2+entry in the cancer cells inducing their proliferation, migration or drug resistance. The cross-talk between lipid mediators and Ca2+ and/or KCa channels needs to be elucidated in EOC in order to facilitate the understanding of its outcomes and potentially suggest novel therapeutic strategies including treatment and prevention.
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Affiliation(s)
- Sana Kouba
- Université de Tours, INSERM, N2C UMR 1069, Faculté de Médecine, Tours, France; Réseau Molécules Marines, Métabolisme et Cancer du Cancéropôle Grand Ouest, France
| | - Lobna Ouldamer
- Université de Tours, INSERM, N2C UMR 1069, Faculté de Médecine, Tours, France; Université de Tours, INSERM, N2C UMR 1069, CHRU de Tours, Service de gynécologie et d'obstétrique, Tours, France
| | - Céline Garcia
- Université de Tours, INSERM, N2C UMR 1069, Faculté de Médecine, Tours, France; Réseau Molécules Marines, Métabolisme et Cancer du Cancéropôle Grand Ouest, France
| | - Delphine Fontaine
- Université de Tours, INSERM, N2C UMR 1069, Faculté de Médecine, Tours, France; Réseau Molécules Marines, Métabolisme et Cancer du Cancéropôle Grand Ouest, France
| | - Aurélie Chantome
- Réseau Molécules Marines, Métabolisme et Cancer du Cancéropôle Grand Ouest, France; Université de Tours, INSERM, N2C UMR 1069, Faculté de Pharmacie, Tours, France
| | - Christophe Vandier
- Université de Tours, INSERM, N2C UMR 1069, Faculté de Médecine, Tours, France; Réseau Molécules Marines, Métabolisme et Cancer du Cancéropôle Grand Ouest, France
| | - Caroline Goupille
- Réseau CASTOR du Cancéropôle Grand Ouest, France; Université de Tours, INSERM, N2C UMR 1069, CHRU de Tours, Faculté de Médecine, Tours, France
| | - Marie Potier-Cartereau
- Université de Tours, INSERM, N2C UMR 1069, Faculté de Médecine, Tours, France; Réseau Molécules Marines, Métabolisme et Cancer du Cancéropôle Grand Ouest, France.
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Li G, Boyle JW, Ko CN, Zeng W, Wong VKW, Wan JB, Chan PWH, Ma DL, Leung CH. Aurone derivatives as Vps34 inhibitors that modulate autophagy. Acta Pharm Sin B 2019; 9:537-544. [PMID: 31193773 PMCID: PMC6543056 DOI: 10.1016/j.apsb.2019.01.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 01/19/2019] [Accepted: 01/23/2019] [Indexed: 12/14/2022] Open
Abstract
We report in this study the identification of a natural product-like antagonist (1a) of Vps34 as a potent autophagy modulator via structure-based virtual screening. Aurone derivative 1a strongly inhibited Vps34 activity in cell-free and cell-based assays. Significantly, 1a prevents autophagy in human cells induced either by starvation or by an mTOR inhibitor. In silico modeling and kinetic data revealed that 1a could function as an ATP-competitive inhibitor of Vps34. Moreover, it suppressed autophagy in vivo and without inducing heart or liver damage in mice. 1a could be utilized as a new motif for more selective and efficacious antagonists of Vps34 for the potential treatment of autophagy-related human diseases.
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Key Words
- Aurone derivative
- Autophagy
- CETSA, cellular thermal shift assay
- Co-IP, co-immunoprecipitation
- DMEM, Dulbecco׳s modified Eagle׳s medium
- DMSO, dimethyl sulfoxide
- EBSS, Earle׳s balanced salt solution
- ELISA, enzyme-linked immunosorbent assay
- FBS, fetal bovine serum
- Heart or liver damage
- Inhibitor
- Natural products
- PE, phosphatidylethanolamine
- PI, phosphatidylinositol
- PI3K, phosphoinositide 3-kinase
- PI3P, phosphatidylinositol 3-phosphate
- PS, phosphatidylserine
- Structure-based virtual screening
- Vesicle trafficking
- Vps34
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8
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Zhang J, Culp ML, Craver JG, Darley-Usmar V. Mitochondrial function and autophagy: integrating proteotoxic, redox, and metabolic stress in Parkinson's disease. J Neurochem 2018; 144:691-709. [PMID: 29341130 PMCID: PMC5897151 DOI: 10.1111/jnc.14308] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 01/04/2018] [Accepted: 01/09/2018] [Indexed: 12/14/2022]
Abstract
Parkinson's disease (PD) is a movement disorder with widespread neurodegeneration in the brain. Significant oxidative, reductive, metabolic, and proteotoxic alterations have been observed in PD postmortem brains. The alterations of mitochondrial function resulting in decreased bioenergetic health is important and needs to be further examined to help develop biomarkers for PD severity and prognosis. It is now becoming clear that multiple hits on metabolic and signaling pathways are likely to exacerbate PD pathogenesis. Indeed, data obtained from genetic and genome association studies have implicated interactive contributions of genes controlling protein quality control and metabolism. For example, loss of key proteins that are responsible for clearance of dysfunctional mitochondria through a process called mitophagy has been found to cause PD, and a significant proportion of genes associated with PD encode proteins involved in the autophagy-lysosomal pathway. In this review, we highlight the evidence for the targeting of mitochondria by proteotoxic, redox and metabolic stress, and the role autophagic surveillance in maintenance of mitochondrial quality. Furthermore, we summarize the role of α-synuclein, leucine-rich repeat kinase 2, and tau in modulating mitochondrial function and autophagy. Among the stressors that can overwhelm the mitochondrial quality control mechanisms, we will discuss 4-hydroxynonenal and nitric oxide. The impact of autophagy is context depend and as such can have both beneficial and detrimental effects. Furthermore, we highlight the potential of targeting mitochondria and autophagic function as an integrated therapeutic strategy and the emerging contribution of the microbiome to PD susceptibility.
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Affiliation(s)
- Jianhua Zhang
- Center for Free Radical Biology, University of Alabama at Birmingham
- Department of Pathology, University of Alabama at Birmingham
- Department of Veterans Affairs, Birmingham VA Medical Center
| | - M Lillian Culp
- Center for Free Radical Biology, University of Alabama at Birmingham
- Department of Pathology, University of Alabama at Birmingham
| | - Jason G Craver
- Center for Free Radical Biology, University of Alabama at Birmingham
- Department of Pathology, University of Alabama at Birmingham
| | - Victor Darley-Usmar
- Center for Free Radical Biology, University of Alabama at Birmingham
- Department of Pathology, University of Alabama at Birmingham
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9
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Wang J, Jia H, Zhang B, Yin L, Mao F, Yu J, Ji C, Xu X, Yan Y, Xu W, Qian H. HucMSC exosome-transported 14-3-3ζ prevents the injury of cisplatin to HK-2 cells by inducing autophagy in vitro. Cytotherapy 2018; 20:29-44. [DOI: 10.1016/j.jcyt.2017.08.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 06/27/2017] [Accepted: 08/02/2017] [Indexed: 01/18/2023]
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10
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Hong-Brown LQ, Brown CR, Navaratnarajah M, Lang CH. FoxO1-AMPK-ULK1 Regulates Ethanol-Induced Autophagy in Muscle by Enhanced ATG14 Association with the BECN1-PIK3C3 Complex. Alcohol Clin Exp Res 2017; 41:895-910. [PMID: 28299793 PMCID: PMC5404978 DOI: 10.1111/acer.13377] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 03/10/2017] [Indexed: 02/06/2023]
Abstract
BACKGROUND Excessive alcohol (EtOH) consumption causes an imbalance in protein metabolism. EtOH impairs protein synthesis in C2C12 myoblasts via a FoxO1-AMPK-TSC2-mTORC1 pathway and also induces protein degradation. As the underlying regulatory signaling cascades for these processes are currently poorly defined, we tested the hypothesis that alcohol-induced autophagy is mediated via activation of the PIK3C3 complex that is regulated by FoxO1-AMPK. METHODS C2C12 myoblasts were incubated with EtOH for various periods of time, and autophagy pathway-related proteins were assessed by Western blotting and immunoprecipitation. Expression of targeted genes was suppressed using electroporation of specific siRNAs and chemical inhibitors. RESULTS Incubation of C2C12 myoblasts with 100 mM EtOH increased the autophagy markers LC3B-II and ATG7, whereas levels of SQSTM1/p62 decreased. The lysosomal inhibitor bafilomycin A1 caused a similar response, although there was no additive effect when combined with EtOH. EtOH altered ULK1 S555 and S757 phosphorylation in a time- and AMPK-dependent manner. The activation of AMPK and ULK1 was associated with increased BECN1 (S93, S14) and PIK3C3/VPS34 (S164) phosphorylation as well as increased total ATG14 and PIK3C3. These changes promoted formation of the ATG14-AMBRA1-BECN1-PIK3C3 proautophagy complex that is important in autophagosome formation. EtOH-induced changes were not associated with increased production of PtdIns3P, which may be due to enhanced PIK3C3 complex binding with 14-3-3θ. Reduction of AMPK using siRNA suppressed the stimulatory effect of EtOH on BECN1 S93, BECN1 S14, and PIK3C3 S164 phosphorylation in a time-dependent manner. Likewise, knockdown of AMPK or chemical inhibition of FoxO1 attenuated phosphorylation of ULK1 at both residues. Knockdown of ULK1 or BECN1 antagonized the effect of EtOH on LC3B-II, SQSTM1, and ATG7 protein expression. CONCLUSIONS EtOH-induced autophagy is mediated through changes in phosphorylation and interaction of various PIK3C3 complex components. This, in turn, is regulated either directly via FoxO1-AMPK or indirectly via the FoxO1-AMPK-ULK1 signaling cascade in a mTORC1-independent or mTORC1-dependent manner.
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Affiliation(s)
- Ly Q. Hong-Brown
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA 17033
| | - C. Randell Brown
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA 17033
| | - Maithili Navaratnarajah
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA 17033
| | - Charles H. Lang
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA 17033
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11
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Sabha N, Volpatti JR, Gonorazky H, Reifler A, Davidson AE, Li X, Eltayeb NM, Dall'Armi C, Di Paolo G, Brooks SV, Buj-Bello A, Feldman EL, Dowling JJ. PIK3C2B inhibition improves function and prolongs survival in myotubular myopathy animal models. J Clin Invest 2016; 126:3613-25. [PMID: 27548528 DOI: 10.1172/jci86841] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 05/19/2016] [Indexed: 11/17/2022] Open
Abstract
Myotubular myopathy (MTM) is a devastating pediatric neuromuscular disorder of phosphoinositide (PIP) metabolism resulting from mutations of the PIP phosphatase MTM1 for which there are no treatments. We have previously shown phosphatidylinositol-3-phosphate (PI3P) accumulation in animal models of MTM. Here, we tested the hypothesis that lowering PI3P levels may prevent or reverse the MTM disease process. To test this, we targeted class II and III PI3 kinases (PI3Ks) in an MTM1-deficient mouse model. Muscle-specific ablation of Pik3c2b, but not Pik3c3, resulted in complete prevention of the MTM phenotype, and postsymptomatic targeting promoted a striking rescue of disease. We confirmed this genetic interaction in zebrafish, and additionally showed that certain PI3K inhibitors prevented development of the zebrafish mtm phenotype. Finally, the PI3K inhibitor wortmannin improved motor function and prolonged lifespan of the Mtm1-deficient mice. In all, we have identified Pik3c2b as a genetic modifier of Mtm1 mutation and demonstrated that PIK3C2B inhibition is a potential treatment strategy for MTM. In addition, we set the groundwork for similar reciprocal inhibition approaches for treating other PIP metabolic disorders and highlight the importance of modifier gene pathways as therapeutic targets.
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12
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Redmann M, Darley-Usmar V, Zhang J. The Role of Autophagy, Mitophagy and Lysosomal Functions in Modulating Bioenergetics and Survival in the Context of Redox and Proteotoxic Damage: Implications for Neurodegenerative Diseases. Aging Dis 2016; 7:150-62. [PMID: 27114848 PMCID: PMC4809607 DOI: 10.14336/ad.2015.0820] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 08/20/2015] [Indexed: 12/21/2022] Open
Abstract
Redox and proteotoxic stress contributes to age-dependent accumulation of dysfunctional mitochondria and protein aggregates, and is associated with neurodegeneration. The free radical theory of aging inspired many studies using reactive species scavengers such as alpha-tocopherol, ascorbate and coenzyme Q to suppress the initiation of oxidative stress. However, clinical trials have had limited success in the treatment of neurodegenerative diseases. We ascribe this to the emerging literature which suggests that the oxidative stress hypothesis does not encompass the role of reactive species in cell signaling and therefore the interception with reactive species with antioxidant supplementation may result in disruption of redox signaling. In addition, the accumulation of redox modified proteins or organelles cannot be reversed by oxidant intercepting antioxidants and must then be removed by alternative mechanisms. We have proposed that autophagy serves this essential function in removing damaged or dysfunctional proteins and organelles thus preserving neuronal function and survival. In this review, we will highlight observations regarding the impact of autophagy regulation on cellular bioenergetics and survival in response to reactive species or reactive species generating compounds, and in response to proteotoxic stress.
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Affiliation(s)
- Matthew Redmann
- Center for Free Radical Biology,; Department of Pathology, University of Alabama at Birmingham
| | - Victor Darley-Usmar
- Center for Free Radical Biology,; Department of Pathology, University of Alabama at Birmingham
| | - Jianhua Zhang
- Center for Free Radical Biology,; Department of Pathology, University of Alabama at Birmingham,; Department of Veterans Affairs, Birmingham VA Medical Center, Birmingham, Alabama 35294, USA
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13
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Lee S, Ye A, Kim J. DNA-Binding Motif of the Imprinted Transcription Factor PEG3. PLoS One 2015; 10:e0145531. [PMID: 26692216 PMCID: PMC4686966 DOI: 10.1371/journal.pone.0145531] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 12/04/2015] [Indexed: 01/04/2023] Open
Abstract
Peg3 is an imprinted gene that is predicted to encode a DNA-binding zinc finger protein. This was previously demonstrated through Chromatin ImmunoPrecipitation-based Sequencing experiments. In the current study, we reanalyzed the previous ChIP-Seq results and further characterized the DNA-binding motif of PEG3. According to the results, PEG3 binds to the promoters and enhancers of a subset of genes that are closely associated with the known functions of Peg3. Some of these identified targets include Tufm, Mrpl45, Cry2, Per1, Slc25a29 and Slc38a2. With this set of targets, we derived a DNA-binding motif of PEG3, 5'-GTGGCAGT-3', which also provides a tabulated matrix that can be used for predicting other unknown genomic targets. Among the newly identified targets, we analyzed in detail the two loci, Slc38a2 and Slc38a4, which are known to be involved in neutral amino acid transport. The results indicated that PEG3 likely functions as a transcriptional repressor for these two loci. Overall, the current study provides a set of genomic targets and also redefines the DNA-binding motif for the imprinted transcription factor PEG3.
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Affiliation(s)
- Suman Lee
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, 70803, United States of America
| | - An Ye
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, 70803, United States of America
| | - Joomyeong Kim
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, 70803, United States of America
- * E-mail:
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14
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Liu X, Zou J, Su J, Lu Y, Zhang J, Li L, Yin F. Downregulation of transient receptor potential cation channel, subfamily C, member 1 contributes to drug resistance and high histological grade in ovarian cancer. Int J Oncol 2015; 48:243-52. [PMID: 26647723 DOI: 10.3892/ijo.2015.3254] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 10/15/2015] [Indexed: 11/05/2022] Open
Abstract
Transient receptor potential cation channel, subfamily C, member 1 (TRPC1) participates in many physiological functions but has also been implicated in cancer development. However, little is known about the role of TRPC1 in ovarian cancer (OC), including the drug resistance of these tumors. In the present study, a significant and consistent downregulation of TRPC1 in drug-resistant OC tissues/cells was determined using real-time quantitative polymerase chain reaction assays and the microarrays deposited in Oncomine and Gene Expression Omnibus (GEO) profiles. Protein/gene-protein/gene and protein-chemical interactions indicated that TRPC1 interacts with 14 proteins/genes and 6 chemicals, all of which are involved in the regulation of drug resistance in OC. Biological process annotation of TRPC1, OC, and drug resistance indicated a role for TRPC1 in drug-resistance-related functions in OC, mainly via the cell cycle, gene expression and cell growth and cell death. Analysis of mRNA-microRNA interactions showed that 8 out of 11 major pathways enriched from 38 predominant microRNAs targeting TRPC1 were involved in the regulation of drug resistance in OC, and 8 out of these top 10 microRNAs were implicated in the drug resistance in ovarian and other cancers. In a clinical analysis using data obtained from The Cancer Genome Atlas project (TCGA) cohort on 341 OC patients, TRPC1 expression was found to differ significantly between grade 2 and grade 3 tumors, with low-level expression correlating with higher tumor grade. This is the first report to show a potential association between the downregulation of TRPC1 and both drug resistance and high histological tumor grade in OC. Our results provide the basis for further investigations of the drug-resistance-related functions of TRPC1 in OC and other forms of cancer.
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Affiliation(s)
- Xia Liu
- Center for Translational Medicine, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Jing Zou
- Medical Scientific Research Centre, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Jie Su
- Key Laboratory of High-Incidence-Tumor Prevention and Treatment (Guangxi Medical University), Ministry of Education, Nanning, Guangxi 530021, P.R. China
| | - Yi Lu
- Center for Translational Medicine, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Jian Zhang
- Center for Translational Medicine, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Li Li
- Key Laboratory of High-Incidence-Tumor Prevention and Treatment (Guangxi Medical University), Ministry of Education, Nanning, Guangxi 530021, P.R. China
| | - Fuqiang Yin
- Medical Scientific Research Centre, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
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15
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Williams K, Gokulan K, Shelman D, Akiyama T, Khan A, Khare S. Cytotoxic Mechanism ofCytolethal Distending Toxinin NontyphoidalSalmonellaSerovar (SalmonellaJaviana) During Macrophage Infection. DNA Cell Biol 2015; 34:113-24. [DOI: 10.1089/dna.2014.2602] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Affiliation(s)
- Katherine Williams
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas
| | - Kuppan Gokulan
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas
| | - Diamond Shelman
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas
| | - Tatsuya Akiyama
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas
| | - Ashraf Khan
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas
| | - Sangeeta Khare
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas
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16
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Teaching the basics of autophagy and mitophagy to redox biologists--mechanisms and experimental approaches. Redox Biol 2015; 4:242-59. [PMID: 25618581 PMCID: PMC4803799 DOI: 10.1016/j.redox.2015.01.003] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 12/24/2014] [Accepted: 01/01/2015] [Indexed: 02/08/2023] Open
Abstract
Autophagy is a lysosomal mediated degradation activity providing an essential mechanism for recycling cellular constituents, and clearance of excess or damaged lipids, proteins and organelles. Autophagy involves more than 30 proteins and is regulated by nutrient availability, and various stress sensing signaling pathways. This article provides an overview of the mechanisms and regulation of autophagy, its role in health and diseases, and methods for its measurement. Hopefully this teaching review together with the graphic illustrations will be helpful for instructors teaching graduate students who are interested in grasping the concepts and major research areas and introducing recent developments in the field. mTOR, Beclin–VPS34, LC3 homologs, and adaptor proteins in autophagy. Autophagosomal membranes may derive from multiple sources. Autophagosomal–lysosomal fusion contributes to the control of autophagic flux. Assess autophagy by autophagosomal and protein turnover, and morphological alterations. Autophagy adysfunction in cancer, aging, neurodegeneration and infection.
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17
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Groenewoud MJ, Goorden SMI, Kassies J, Pellis-van Berkel W, Lamb RF, Elgersma Y, Zwartkruis FJT. Mammalian target of rapamycin complex I (mTORC1) activity in ras homologue enriched in brain (Rheb)-deficient mouse embryonic fibroblasts. PLoS One 2013; 8:e81649. [PMID: 24303063 PMCID: PMC3841147 DOI: 10.1371/journal.pone.0081649] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 10/15/2013] [Indexed: 11/19/2022] Open
Abstract
The Ras-like GTPase Rheb has been identified as a crucial activator of mTORC1. Activation most likely requires a direct interaction between Rheb and mTOR, but the exact mechanism remains unclear. Using a panel of Rheb-deficient mouse embryonic fibroblasts (MEFs), we show that Rheb is indeed essential for the rapid increase of mTORC1 activity following stimulation with insulin or amino acids. However, mTORC1 activity is less severely reduced in Rheb-deficient MEFs in the continuous presence of serum or upon stimulation with serum. This remaining mTORC1 activity is blocked by depleting the cells for amino acids or imposing energy stress. In addition, MEK inhibitors and the RSK-inhibitor BI-D1870 interfere in mTORC1 activity, suggesting that RSK acts as a bypass for Rheb in activating mTORC1. Finally, we show that this rapamycin-sensitive, Rheb-independent mTORC1 activity is important for cell cycle progression. In conclusion, whereas rapid adaptation in mTORC1 activity requires Rheb, a second Rheb-independent activation mechanism exists that contributes to cell cycle progression.
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Affiliation(s)
- Marlous J. Groenewoud
- Molecular Cancer Research, Centre for Biomedical Genetics and Cancer Genomics Centre, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Susan M. I. Goorden
- Department of Neuroscience, ENCORE expertise center for neuro-developmental disorders, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Jorien Kassies
- Molecular Cancer Research, Centre for Biomedical Genetics and Cancer Genomics Centre, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Wendy Pellis-van Berkel
- Molecular Cancer Research, Centre for Biomedical Genetics and Cancer Genomics Centre, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Richard F. Lamb
- Department of Molecular and Clinical Cancer Medicine, University of Liverpool, Cancer Research UK Centre, Liverpool, United Kingdom
| | - Ype Elgersma
- Department of Neuroscience, ENCORE expertise center for neuro-developmental disorders, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Fried J. T. Zwartkruis
- Molecular Cancer Research, Centre for Biomedical Genetics and Cancer Genomics Centre, University Medical Center Utrecht, Utrecht, The Netherlands
- * E-mail:
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18
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Devereaux K, Dall’Armi C, Alcazar-Roman A, Ogasawara Y, Zhou X, Wang F, Yamamoto A, De Camilli P, Di Paolo G. Regulation of mammalian autophagy by class II and III PI 3-kinases through PI3P synthesis. PLoS One 2013; 8:e76405. [PMID: 24098492 PMCID: PMC3789715 DOI: 10.1371/journal.pone.0076405] [Citation(s) in RCA: 133] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 08/30/2013] [Indexed: 11/19/2022] Open
Abstract
Synthesis of phosphatidylinositol-3-phosphate (PI3P) by Vps34, a class III phosphatidylinositol 3-kinase (PI3K), is critical for the initial steps of autophagosome (AP) biogenesis. Although Vps34 is the sole source of PI3P in budding yeast, mammalian cells can produce PI3P through alternate pathways, including direct synthesis by the class II PI3Ks; however, the physiological relevance of these alternate pathways in the context of autophagy is unknown. Here we generated Vps34 knockout mouse embryonic fibroblasts (MEFs) and using a higher affinity 4x-FYVE finger PI3P-binding probe found a Vps34-independent pool of PI3P accounting for (~)35% of the total amount of this lipid species by biochemical analysis. Importantly, WIPI-1, an autophagy-relevant PI3P probe, still formed some puncta upon starvation-induced autophagy in Vps34 knockout MEFs. Additional characterization of autophagy by electron microscopy as well as protein degradation assays showed that while Vps34 is important for starvation-induced autophagy there is a significant component of functional autophagy occurring in the absence of Vps34. Given these findings, class II PI3Ks (α and β isoforms) were examined as potential positive regulators of autophagy. Depletion of class II PI3Ks reduced recruitment of WIPI-1 and LC3 to AP nucleation sites and caused an accumulation of the autophagy substrate, p62, which was exacerbated upon the concomitant ablation of Vps34. Our studies indicate that while Vps34 is the main PI3P source during autophagy, class II PI3Ks also significantly contribute to PI3P generation and regulate AP biogenesis.
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Affiliation(s)
- Kelly Devereaux
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, New York, United States of America
- Taub Institute for Research on Alzheimer’s Disease and the Aging Brain, Columbia University Medical Center, New York, New York, United States of America
| | - Claudia Dall’Armi
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, New York, United States of America
- Taub Institute for Research on Alzheimer’s Disease and the Aging Brain, Columbia University Medical Center, New York, New York, United States of America
| | - Abel Alcazar-Roman
- Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut, United States of America
- Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, United States of America
| | - Yuta Ogasawara
- Department of Animal Bio-Science, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Xiang Zhou
- Department of Cell Biology, Duke University Medical Center, Durham, North Carolina, United States of America
- Department of Neurobiology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Fan Wang
- Department of Cell Biology, Duke University Medical Center, Durham, North Carolina, United States of America
- Department of Neurobiology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Akitsugu Yamamoto
- Department of Animal Bio-Science, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Pietro De Camilli
- Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut, United States of America
- Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, United States of America
| | - Gilbert Di Paolo
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, New York, United States of America
- Taub Institute for Research on Alzheimer’s Disease and the Aging Brain, Columbia University Medical Center, New York, New York, United States of America
- * E-mail:
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Abstract
Amino acid–sensing mTOR signaling controls the homeostasis of skeletal myogenesis. The Rag GTPases negatively regulate differentiation by activating mTORC1 and subsequently suppressing the IRS1-PI3K-Akt pathway, whereas a Vps34-PLD1-PA-mTOR pathway activates the transcriptional regulation of Igf2 that is essential for myogenesis. Signaling through the mammalian target of rapamycin (mTOR) in response to amino acid availability controls many cellular and developmental processes. mTOR is a master regulator of myogenic differentiation, but the pathways mediating amino acid signals in this process are not known. Here we examine the Rag GTPases and the class III phosphoinositide 3-kinase (PI3K) Vps34, two mediators of amino acid signals upstream of mTOR complex 1 (mTORC1) in cell growth regulation, for their potential involvement in myogenesis. We find that, although both Rag and Vps34 mediate amino acid activation of mTORC1 in C2C12 myoblasts, they have opposing functions in myogenic differentiation. Knockdown of RagA/B enhances, whereas overexpression of active RagB/C mutants impairs, differentiation, and this inhibitory function of Rag is mediated by mTORC1 suppression of the IRS1-PI3K-Akt pathway. On the other hand, Vps34 is required for myogenic differentiation. Amino acids activate a Vps34-phospholipase D1 (PLD1) pathway that controls the production of insulin-like growth factor II, an autocrine inducer of differentiation, through the Igf2 muscle enhancer. The product of PLD, phosphatidic acid, activates the enhancer in a rapamycin-sensitive but mTOR kinase–independent manner. Our results uncover amino acid–sensing mechanisms controlling the homeostasis of myogenesis and underline the versatility and context dependence of mTOR signaling.
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Affiliation(s)
- Mee-Sup Yoon
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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20
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Sparks JD, O'Dell C, Chamberlain JM, Sparks CE. Insulin-dependent apolipoprotein B degradation is mediated by autophagy and involves class I and class III phosphatidylinositide 3-kinases. Biochem Biophys Res Commun 2013; 435:616-20. [PMID: 23685141 DOI: 10.1016/j.bbrc.2013.05.029] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2013] [Accepted: 05/07/2013] [Indexed: 01/07/2023]
Abstract
Insulin acutely stimulates the degradation of apolipoprotein B (apo B) which decreases very low density lipoprotein (VLDL) secretion by liver. Insulin-dependent apo B degradation (IDAD) occurs following phosphatidylinositide 3-kinase (PI3K) activation and involves lysosomal degradation. Insulin suppression of apo B secretion is blocked by over-expression of phosphatase and tensin homologue (PTEN) in McArdle RH7777 (McA) cells suggesting the importance of Class I PI3K generated PI (3,4,5) triphosphate (PIP3) in IDAD. Classical autophagy inhibitors including 3-methyladenine, L-asparagine and bafilomycin A1 also blocked the ability of insulin to suppress apo B secretion by rat hepatocytes (RH) suggesting that IDAD occurs through an autophagy-related mechanism. IDAD is also blocked following over-expression in McA cells of a dominant negative kinase-defective Vps34, a class III PI3K that generates PI 3-monophosphate required for autophagy. Vps34 inhibition of IDAD occurs without altering insulin-dependent S473 phosphorylation of Akt indicating PI3K/PIP3/Akt signaling is intact. Cellular p62/SQSTM1, an inverse indicator of autophagy, is increased with insulin treatment consistent with the known ability of insulin to inhibit autophagy, and therefore the role of insulin in utilizing components of autophagy for apo B degradation is unexpected. Thapsigargan, an inducer of endoplasmic reticulum (ER) stress, and a recently demonstrated autophagy inhibitor, blocked apo B secretion which contrasted with other autophagy inhibitors and mutant Vps34 results which were permissive with respect to apo B secretion. Pulse chase studies indicated that intact B100 and B48 proteins were retained in cells treated with thapsigargan consistent with their accumulation in autophagosomal vacuoles. Differences between IDAD and ER stress-coupled autophagy mediated by thapsgargin suggest that IDAD involves an unique form of autophagy. Insulin action resulting in hepatic apo B degradation is novel and important in understanding regulation of hepatic VLDL metabolism.
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Affiliation(s)
- Janet D Sparks
- Department of Pathology & Laboratory Medicine, University of Rochester Medical Center, Box 626, 601 Elmwood Avenue, Rochester, NY 14642, USA.
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