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Mitchem MM, Shrader C, Abedi E, Truman AW. Novel insights into the post-translational modifications of Ydj1/DNAJA1 co-chaperones. Cell Stress Chaperones 2024; 29:1-9. [PMID: 38309209 PMCID: PMC10939075 DOI: 10.1016/j.cstres.2023.11.001] [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: 09/16/2023] [Revised: 10/18/2023] [Accepted: 11/04/2023] [Indexed: 02/05/2024] Open
Abstract
The activity of the Hsp70 molecular chaperone is regulated by a suite of helper co-chaperones that include J-proteins. Studies on J-proteins have historically focused on their expression, localization, and activation of Hsp70. There is growing evidence that the post-translational modifications (PTMs) of chaperones (the chaperone code) fine-tune chaperone function. This mini-review summarizes the current understanding of the role and regulation of PTMs on the major J-proteins Ydj1 and DNAJA1. Understanding these PTMs may provide novel therapeutic avenues for targeting chaperone activity in cancer and neurodegenerative diseases.
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Affiliation(s)
- Megan M Mitchem
- Department of Biological Sciences, The University of North Carolina at Charlotte, Charlotte, NC 28223, USA
| | - Courtney Shrader
- Department of Biological Sciences, The University of North Carolina at Charlotte, Charlotte, NC 28223, USA
| | - Elizabeth Abedi
- Department of Biological Sciences, The University of North Carolina at Charlotte, Charlotte, NC 28223, USA
| | - Andrew W Truman
- Department of Biological Sciences, The University of North Carolina at Charlotte, Charlotte, NC 28223, USA.
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2
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Yu M, Jiang C, Liang J, Zhang H, Teng X, Kang L. HSP27-HSP40-HSP70-HSP90 pathway participated in molecular mechanism of selenium alleviating lead-caused oxidative damage and proteotoxicity in chicken Bursa of Fabricius. Anim Biotechnol 2023; 34:4403-4414. [PMID: 36542527 DOI: 10.1080/10495398.2022.2155175] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Lead (Pb), a toxic environmental pollutant, is hazardous to the health of humans and birds. Bursa of Fabricius (BF) is a unique organ of birds. Toxic substances can attack BF and induce proteotoxicity. Increased heat shock proteins (HSPs) can induce oxidative damage. Selenium (Se) can alleviate harmful substance-caused oxidative damage. This study aimed to investigate whether Pb can cause oxidative damage and proteotoxicity, as well as Se reverse Pb-caused chicken BF toxicity. A model of chickens treated with Se and Pb alone and in combination was established. BFs were collected on days 30, 60, and 90. H&E and qRT-PCR were performed to observe the microstructure and to detect HSP27, HSP40, HSP60, HSP70, and HSP90 mRNA levels, respectively, in BFs. Multivariate correlation analysis and principal component analysis were conducted to explore the correlation among the five HSPs. In our results, Pb caused BF damage and up-regulated the five HSPs at three time points, causing oxidative damage and proteotoxicity via HSP27-HSP40-HSP70-HSP90 pathway. Furthermore, Pb caused time-dependent stress on HSP27, HSP40, HSP60, and HSP70. In addition, Se relieved Pb-caused damage and up-regulation of HSPs. Taken together, we concluded that Se alleviated Pb-caused oxidative injury and proteotoxicity in chicken BFs via the HSP27-HSP40-HSP70-HSP90 pathway.
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Affiliation(s)
- Meijin Yu
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
| | - Chunyu Jiang
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
| | - Jiatian Liang
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
| | - Hui Zhang
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
| | - Xiaohua Teng
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
| | - Lu Kang
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
- Institute of Agricultural Quality Standards and Testing Technology, Xinjiang Academy of Agricultural Sciences, Urumqi, China
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3
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Manunu B, Serafin AM, Akudugu JM. BAG1, MGMT, FOXO1, and DNAJA1 as potential drug targets for radiosensitizing cancer cell lines. Int J Radiat Biol 2023; 99:292-307. [PMID: 35511481 DOI: 10.1080/09553002.2022.2074164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND AND PURPOSE Activation of some signaling pathways can promote cell survival and have a negative impact on tumor response to radiotherapy. Here, the role of differences in expression levels of genes related to the poly(ADP-ribose) polymerase-1 (PARP-1), heat shock protein 90 (Hsp90), B-cell lymphoma 2 (Bcl-2), and phosphoinositide 3-kinase (PI3K) pathways in the survival or death of cells following X-ray exposure was investigated. METHODS Eight human cell cultures (MCF-7 and MDA-MB-231: breast cancers; MCF-12A: apparently normal breast; A549: lung cancer; L132: normal lung; G28, G44 and G112: glial cancers) were irradiated with X-rays. The colony-forming and real-time PCR based on a custom human pathway RT2 Profiler PCR Array assays were used to evaluate cell survival and gene expression, respectively. RESULTS The surviving fractions at 2 Gy for the cell lines, in order of increasing radioresistance, were found to be as follows: MCF-7 (0.200 ± 0.011), G44 (0.277 ± 0.065), L132 (0.367 ± 0.023), MDA-MB-231 (0.391 ± 0.057), G112 (0.397 ± 0.113), A549 (0.490 ± 0.048), MCF-12A (0.526 ± 0.004), and G28 (0.633 ± 0.094). The rank order of radioresistance at 6 Gy was: MCF-7 < L132 < G44 < MDA-MB-231 < A549 < G28 < G112 < MCF-12A. PCR array data analysis revealed that several genes were differentially expressed between irradiated and unirradiated cell cultures. The following genes, with fold changes: BCL2A1 (21.91), TP53 (8743.75), RAD51 (11.66), FOX1 (65.86), TCP1 (141.32), DNAJB1 (3283.64), RAD51 (51.52), and HSPE1 (12887.29) were highly overexpressed, and BAX (-127.21), FOX1 (-81.79), PDPK1 (-1241.78), BRCA1 (-8.70), MLH1 (-12143.95), BCL2 (-18.69), CCND1 (-46475.98), and GJA1 (-2832.70) were highly underexpressed in the MDA-MB-231, MCF-7, MCF-12A, A549, L132, G28, G44, and G112 cell lines, respectively. The radioresistance in the malignant A549 and G28 cells was linked to upregulation in the apoptotic, DNA repair, PI3K, and Hsp90 pathway genes BAG1, MGMT, FOXO1, and DNAJA1, respectively, and inhibition of these genes resulted in significant radiosensitization. CONCLUSIONS Targeting BAG1, MGMT, FOXO1, and DNAJA1 with specific inhibitors might effectively sensitize radioresistant tumors to radiotherapy.
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Affiliation(s)
- Bayanika Manunu
- Division of Radiobiology, Department of Medical Imaging and Clinical Oncology, Faculty of Medicine and Health Sciences, Stellenbosch University, South Africa
| | - Antonio M Serafin
- Division of Radiobiology, Department of Medical Imaging and Clinical Oncology, Faculty of Medicine and Health Sciences, Stellenbosch University, South Africa
| | - John M Akudugu
- Division of Radiobiology, Department of Medical Imaging and Clinical Oncology, Faculty of Medicine and Health Sciences, Stellenbosch University, South Africa
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Ono K, Eguchi T. Large-Scale Databases and Portals on Cancer Genome to Analyze Chaperone Genes Correlated to Patient Prognosis. Methods Mol Biol 2023; 2693:293-306. [PMID: 37540443 DOI: 10.1007/978-1-0716-3342-7_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
Molecular chaperones, such as heat shock proteins (HSPs), have attracted attention as molecules involved in malignant events in cancers and are potential therapeutic targets and biomarkers for tumor therapy. Furthermore, mutations in chaperones can significantly impact cancer risk and prognosis. Bioinformatics is a particularly useful method for developing biomarkers as a practical consideration for the immediate clinical application of data. Many large-scale databases and portals on cancer genome are nowadays publicly available, including the International Cancer Genome Consortium (ICGC); The Cancer Genome Atlas (TCGA), renamed as Genomic Data Commons (GDC); Catalogue of Somatic Mutations in Cancer (COSMIC); and Cancer Cell Line Encyclopedia (CCLE). Referring to these databases, advanced web portals are publicized, including cBioPortal, Human Protein Atlas (HPA), Kaplan-Meier (KM) plotter, Gene Expression Profiling Interactive Analysis 2 (GEPIA2), Genomics of Drug Sensitivity in Cancer (GDSC), and Dependency Map (DepMap). Here, we assemble these databases and portals to clarify what is available and useful for current cancer research and provide protocols to utilize the HPA, KM plotter, and GEPIA2 for studies on chaperone genes in cancer patients. Utilizing these portals will reveal the correlation between tumor subtype-specific high expression of chaperone genes and patient prognosis. Our protocols are useful to increase systematic awareness of chaperones and find new biomarkers for diagnosis and prognosis and new targets for anticancer drugs.
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Affiliation(s)
- Kisho Ono
- Department of Oral and Maxillofacial Surgery, Okayama University Hospital, Okayama, Japan
| | - Takanori Eguchi
- Department of Dental Pharmacology, Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
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Parma B, Wurdak H, Ceppi P. Harnessing mitochondrial metabolism and drug resistance in non-small cell lung cancer and beyond by blocking heat-shock proteins. Drug Resist Updat 2022; 65:100888. [DOI: 10.1016/j.drup.2022.100888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 10/10/2022] [Accepted: 10/25/2022] [Indexed: 11/30/2022]
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Omkar S, Wani TH, Zheng B, Mitchem MM, Truman AW. The APE2 Exonuclease Is a Client of the Hsp70–Hsp90 Axis in Yeast and Mammalian Cells. Biomolecules 2022; 12:biom12070864. [PMID: 35883419 PMCID: PMC9312491 DOI: 10.3390/biom12070864] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 06/18/2022] [Accepted: 06/18/2022] [Indexed: 12/10/2022] Open
Abstract
Molecular chaperones such as Hsp70 and Hsp90 help fold and activate proteins in important signal transduction pathways that include DNA damage response (DDR). Previous studies have suggested that the levels of the mammalian APE2 exonuclease, a protein critical for DNA repair, may be dependent on chaperone activity. In this study, we demonstrate that the budding yeast Apn2 exonuclease interacts with molecular chaperones Ssa1 and Hsp82 and the co-chaperone Ydj1. Although Apn2 does not display a binding preference for any specific cytosolic Hsp70 or Hsp90 paralog, Ssa1 is unable to support Apn2 stability when present as the sole Ssa in the cell. Demonstrating conservation of this mechanism, the exonuclease APE2 also binds to Hsp70 and Hsp90 in mammalian cells. Inhibition of chaperone function via specific small molecule inhibitors results in a rapid loss of APE2 in a range of cancer cell lines. Taken together, these data identify APE2 and Apn2 as clients of the chaperone system in yeast and mammalian cells and suggest that chaperone inhibition may form the basis of novel anticancer therapies that target APE2-mediated processes.
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DNAJA1 Stabilizes EF1A1 to Promote Cell Proliferation and Metastasis of Liver Cancer Mediated by miR-205-5p. JOURNAL OF ONCOLOGY 2022; 2022:2292481. [PMID: 35586205 PMCID: PMC9110222 DOI: 10.1155/2022/2292481] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 03/05/2022] [Accepted: 03/22/2022] [Indexed: 11/22/2022]
Abstract
Liver cancer is one of the most common and aggressive malignancies worldwide with poor prognosis. Studies on pathogenesis of liver cancer are urgently demanded to develop better treatment strategy. Here, we found that overexpression of DnaJ heat shock protein family (Hsp40) member A1 (DNAJA1) increased cell proliferation, invasion, and angiogenesis in Huh 7 and HepG2 cells, while depletion of DNAJA1 in MHCC-97H and HCC-M3 showed opposite effects. In vivo functional assays indicated that DNAJA1 promoted tumor growth and pulmonary metastasis in mice. Mechanistically, as a direct target of miR-205-5p, DNAJA1 promoted proliferation and metastasis of liver cancer cells by stabilizing eukaryotic elongation factor 1A1 (EF1A1). Moreover, DNAJA was markedly upregulated in liver cancer tissues (P < 0.05) and was significantly associated with poor prognosis. And its expression was correlated with differentiation (P < 0.001), dissemination (P < 0.001), and serum AFP (P = 0.029). The mRNA levels of miR-205-5p and DNAJA1 were negatively correlated in liver cancer. In conclusion, our study reveals that DNAJA1 acts as an oncogene in liver cancer via miR-205-5p/EF1A1 axis and might be a potential biomarker to predict the prognosis for liver cancer patients.
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The C-terminal domain of Hsp70 is responsible for paralog-specific regulation of ribonucleotide reductase. PLoS Genet 2022; 18:e1010079. [PMID: 35417483 PMCID: PMC9037926 DOI: 10.1371/journal.pgen.1010079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 04/25/2022] [Accepted: 03/21/2022] [Indexed: 11/23/2022] Open
Abstract
The Hsp70 family of molecular chaperones is well-conserved and expressed in all organisms. In budding yeast, cells express four highly similar cytosolic Hsp70s Ssa1, 2, 3 and 4 which arose from gene duplication. Ssa1 and 2 are constitutively expressed while Ssa3 and 4 are induced upon heat shock. Recent evidence suggests that despite their amino acid similarity, these Ssas have unique roles in the cell. Here we examine the relative importance of Ssa1-4 in the regulation of the enzyme ribonucleotide reductase (RNR). We demonstrate that cells expressing either Ssa3 or Ssa4 as their sole Ssa are compromised for their resistance to DNA damaging agents and activation of DNA damage response (DDR)-regulated transcription. In addition, we show that the steady state levels and stability of RNR small subunits Rnr2 and Rnr4 are reduced in Ssa3 or Ssa4-expressing cells, a result of decreased Ssa-RNR interaction. Interaction between the Hsp70 co-chaperone Ydj1 and RNR is correspondingly decreased in cells only expressing Ssa3 and 4. Through studies of Ssa2/4 domain swap chimeras, we determined that the C-terminal domain of Ssas are the source of this functional specificity. Taking together, our work suggests a distinct role for Ssa paralogs in regulating DNA replication mediated by C-terminus sequence variation. Cells require molecular chaperones to fold proteins into their active conformation. A major mystery however is why cells express so many highly-related and apparently redundant Hsp70 paralogs. We examined the role of four Hsp70 paralogs in budding yeast (Ssa1, 2, 3 and 4) on the activity of the ribonucleotide reductase (RNR complex). Importantly, we demonstrate there is selectivity of RNR subunits for Ssa1 and Ssa2 subunits, which is dictated by the co-chaperone Ydj1. Taken together, our work provides new insight into the functional specificity of Hsp70 paralogs using a native client protein.
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9
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Lang BJ, Prince TL, Okusha Y, Bunch H, Calderwood SK. Heat shock proteins in cell signaling and cancer. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2022; 1869:119187. [PMID: 34906617 DOI: 10.1016/j.bbamcr.2021.119187] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 11/24/2021] [Accepted: 12/05/2021] [Indexed: 01/17/2023]
Abstract
Heat Shock Proteins (HSPs) and their co-chaperones have well-established roles in regulating proteostasis within the cell, the nature of which continues to emerge with further study. To date, HSPs have been shown to be integral to protein folding and re-folding, protein transport, avoidance of protein aggregation, and modulation of protein degradation. Many cell signaling events are mediated by the chemical modification of proteins post-translationally that can alter protein conformation and activity, although it is not yet known whether the changes in protein conformation induced by post-translational modifications (PTMs) are also dependent upon HSPs and their co-chaperones for subsequent protein re-folding. We discuss what is known regarding roles for HSPs and other molecular chaperones in cell signaling events with a focus on oncogenic signaling. We also propose a hypothesis by which Hsp70 and Hsp90 may co-operate to facilitate cell signaling events that may link PTMs with the cellular protein folding machinery.
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Affiliation(s)
- Benjamin J Lang
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Thomas L Prince
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA; Ranok Therapeutics, Waltham, MA 02451, USA
| | - Yuka Okusha
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Heeyoun Bunch
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Stuart K Calderwood
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
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10
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Role of Biomarkers in FLT3 AML. Cancers (Basel) 2022; 14:cancers14051164. [PMID: 35267471 PMCID: PMC8909069 DOI: 10.3390/cancers14051164] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 02/22/2022] [Accepted: 02/23/2022] [Indexed: 12/19/2022] Open
Abstract
Simple Summary Genetically heterogeneous disorder acute myeloid leukemia (AML) is marked by recurring mutations in FLT3. Current FLT3 inhibitors and other emerging inhibitors have helped in the improvement of the quality of standard of care therapies; however, the overall survival of the patients remains static. This is due to numerous mutations in FLT3, which causes resistance against these FLT3 inhibitors. For effective treatment of AML patients, alternative approaches are required to overcome this resistance. Here, we will summarize the biomarkers for FLT3 inhibitors in AML, as well as the alternative measures to overcome resistance to the current therapies. Abstract Acute myeloid leukemia is a disease characterized by uncontrolled proliferation of clonal myeloid blast cells that are incapable of maturation to leukocytes. AML is the most common leukemia in adults and remains a highly fatal disease with a five-year survival rate of 24%. More than 50% of AML patients have mutations in the FLT3 gene, rendering FLT3 an attractive target for small-molecule inhibition. Currently, there are several FLT3 inhibitors in the clinic, and others remain in clinical trials. However, these inhibitors face challenges due to lack of efficacy against several FLT3 mutants. Therefore, the identification of biomarkers is vital to stratify AML patients and target AML patient population with a particular FLT3 mutation. Additionally, there is an unmet need to identify alternative approaches to combat the resistance to FLT3 inhibitors. Here, we summarize the current knowledge on the utilization of diagnostic, prognostic, predictive, and pharmacodynamic biomarkers for FLT3-mutated AML. The resistance mechanisms to various FLT3 inhibitors and alternative approaches to combat this resistance are also discussed and presented.
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11
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Bahmad HF, Demus T, Moubarak MM, Daher D, Alvarez Moreno JC, Polit F, Lopez O, Merhe A, Abou-Kheir W, Nieder AM, Poppiti R, Omarzai Y. Overcoming Drug Resistance in Advanced Prostate Cancer by Drug Repurposing. Med Sci (Basel) 2022; 10:medsci10010015. [PMID: 35225948 PMCID: PMC8883996 DOI: 10.3390/medsci10010015] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Revised: 02/12/2022] [Accepted: 02/16/2022] [Indexed: 12/12/2022] Open
Abstract
Prostate cancer (PCa) is the second most common cancer in men. Common treatments include active surveillance, surgery, or radiation. Androgen deprivation therapy and chemotherapy are usually reserved for advanced disease or biochemical recurrence, such as castration-resistant prostate cancer (CRPC), but they are not considered curative because PCa cells eventually develop drug resistance. The latter is achieved through various cellular mechanisms that ultimately circumvent the pharmaceutical’s mode of action. The need for novel therapeutic approaches is necessary under these circumstances. An alternative way to treat PCa is by repurposing of existing drugs that were initially intended for other conditions. By extrapolating the effects of previously approved drugs to the intracellular processes of PCa, treatment options will expand. In addition, drug repurposing is cost-effective and efficient because it utilizes drugs that have already demonstrated safety and efficacy. This review catalogues the drugs that can be repurposed for PCa in preclinical studies as well as clinical trials.
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Affiliation(s)
- Hisham F. Bahmad
- Arkadi M. Rywlin M.D. Department of Pathology and Laboratory Medicine, Mount Sinai Medical Center, Miami Beach, FL 33140, USA; (J.C.A.M.); (F.P.); (R.P.); (Y.O.)
- Correspondence: or ; Tel.: +1-786-961-0216
| | - Timothy Demus
- Division of Urology, Columbia University, Mount Sinai Medical Center, Miami Beach, FL 33140, USA; (T.D.); (A.M.N.)
| | - Maya M. Moubarak
- Department of Anatomy, Cell Biology, and Physiological Sciences, Faculty of Medicine, American University of Beirut, Beirut 1107-2020, Lebanon; (M.M.M.); (W.A.-K.)
- CNRS, IBGC, UMR5095, Universite de Bordeaux, F-33000 Bordeaux, France
| | - Darine Daher
- Faculty of Medicine, American University of Beirut, Beirut 1107-2020, Lebanon;
| | - Juan Carlos Alvarez Moreno
- Arkadi M. Rywlin M.D. Department of Pathology and Laboratory Medicine, Mount Sinai Medical Center, Miami Beach, FL 33140, USA; (J.C.A.M.); (F.P.); (R.P.); (Y.O.)
| | - Francesca Polit
- Arkadi M. Rywlin M.D. Department of Pathology and Laboratory Medicine, Mount Sinai Medical Center, Miami Beach, FL 33140, USA; (J.C.A.M.); (F.P.); (R.P.); (Y.O.)
| | - Olga Lopez
- Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA;
| | - Ali Merhe
- Department of Urology, Jackson Memorial Hospital, University of Miami, Leonard M. Miller School of Medicine, Miami, FL 33136, USA;
| | - Wassim Abou-Kheir
- Department of Anatomy, Cell Biology, and Physiological Sciences, Faculty of Medicine, American University of Beirut, Beirut 1107-2020, Lebanon; (M.M.M.); (W.A.-K.)
| | - Alan M. Nieder
- Division of Urology, Columbia University, Mount Sinai Medical Center, Miami Beach, FL 33140, USA; (T.D.); (A.M.N.)
- Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA;
| | - Robert Poppiti
- Arkadi M. Rywlin M.D. Department of Pathology and Laboratory Medicine, Mount Sinai Medical Center, Miami Beach, FL 33140, USA; (J.C.A.M.); (F.P.); (R.P.); (Y.O.)
- Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA;
| | - Yumna Omarzai
- Arkadi M. Rywlin M.D. Department of Pathology and Laboratory Medicine, Mount Sinai Medical Center, Miami Beach, FL 33140, USA; (J.C.A.M.); (F.P.); (R.P.); (Y.O.)
- Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA;
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Jiao S, Bai C, Qi C, Wu H, Hu L, Li F, Yang K, Zhao C, Ouyang H, Pang D, Tang X, Xie Z. Identification and Functional Analysis of the Regulatory Elements in the pHSPA6 Promoter. Genes (Basel) 2022; 13:genes13020189. [PMID: 35205234 PMCID: PMC8872561 DOI: 10.3390/genes13020189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/14/2022] [Accepted: 01/19/2022] [Indexed: 12/10/2022] Open
Abstract
Functional and expressional research of heat shock protein A6 (HSPA6) suggests that the gene is of great value for neurodegenerative diseases, biosensors, cancer, etc. Based on the important value of pigs in agriculture and biomedicine and to advance knowledge of this little-studied HSPA member, the stress-sensitive sites in porcine HSPA6 (pHSPA6) were investigated following different stresses. Here, two heat shock elements (HSEs) and a conserved region (CR) were identified in the pHSPA6 promoter by a CRISPR/Cas9-mediated precise gene editing strategy. Gene expression data showed that sequence disruption of these regions could significantly reduce the expression of pHSPA6 under heat stress. Stimulation studies indicated that these regions responded not only to heat stress but also to copper sulfate, MG132, and curcumin. Further mechanism studies showed that downregulated pHSPA6 could significantly affect some important members of the HSP family that are involved in HSP40, HSP70, and HSP90. Overall, our results provide a new approach for investigating gene expression and regulation that may contribute to gene regulatory mechanisms, drug target selection, and breeding stock selection.
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Affiliation(s)
- Shuyu Jiao
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
| | - Chunyan Bai
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
| | - Chunyun Qi
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
| | - Heyong Wu
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
| | - Lanxin Hu
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
| | - Feng Li
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
| | - Kang Yang
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
| | - Chuheng Zhao
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
| | - Hongsheng Ouyang
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
- Key Lab for Zoonoses Research, Ministry of Education, Animal Genome Editing Technology Innovation Center, Jilin University, Changchun 130062, China
- Chongqing Research Institute, Jilin University, Chongqing 401123, China
- Chongqing Jitang Biotechnology Research Institute Co., Ltd., Chongqing 401123, China
| | - Daxin Pang
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
- Key Lab for Zoonoses Research, Ministry of Education, Animal Genome Editing Technology Innovation Center, Jilin University, Changchun 130062, China
- Chongqing Research Institute, Jilin University, Chongqing 401123, China
- Chongqing Jitang Biotechnology Research Institute Co., Ltd., Chongqing 401123, China
| | - Xiaochun Tang
- Key Lab for Zoonoses Research, Ministry of Education, Animal Genome Editing Technology Innovation Center, Jilin University, Changchun 130062, China
- Chongqing Research Institute, Jilin University, Chongqing 401123, China
- Chongqing Jitang Biotechnology Research Institute Co., Ltd., Chongqing 401123, China
- Correspondence: (X.T.); (Z.X.)
| | - Zicong Xie
- College of Animal Science, Jilin University, Changchun 130062, China; (S.J.); (C.B.); (C.Q.); (H.W.); (L.H.); (F.L.); (K.Y.); (C.Z.); (H.O.); (D.P.)
- Correspondence: (X.T.); (Z.X.)
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13
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Li Y, Liu X, Chen H, Xie P, Ma R, He J, Zhang H. Bioinformatics analysis for the role of CALR in human cancers. PLoS One 2021; 16:e0261254. [PMID: 34910788 PMCID: PMC8673678 DOI: 10.1371/journal.pone.0261254] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 11/27/2021] [Indexed: 01/06/2023] Open
Abstract
Cancer is one of the most important public health problems in the world. The curative effect of traditional surgery, radiotherapy and chemotherapy is limited and has inevitable side effects. As a potential target for tumor therapy, few studies have comprehensively analyzed the role of CALR in cancers. Therefore, by using GeneCards, UALCAN, GEPIA, Kaplan-Meier Plotter, COSMIC, Regulome Explorer, String, GeneMANIA and TIMER databases, we collected and analyzed relevant data to conduct in-depth bioinformatics research on the CALR expression in Pan-cancer to assess the possibility of CALR as a potential therapeutic target and survival biomarker. We studied the CALR expression in normal human tissues and various tumors of different stages, and found that CALR expression was associated with relapse free survival (RFS). We verified the expression of CALR in breast cancer cell lines by vitro experiments. Mutations of CALR were widely present in tumors. CALR interacted with different genes and various proteins. In tumors, a variety of immune cells are closely related to CALR. In conclusion, CALR can be used as a biomarker for predicting prognosis and a potential target for tumor molecular and immunotherapy.
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Affiliation(s)
- Yijun Li
- Departments of Breast Surgery, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, People’s Republic of China
| | - Xiaoxu Liu
- Departments of Breast Surgery, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, People’s Republic of China
| | - Heyan Chen
- Departments of Breast Surgery, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, People’s Republic of China
| | - Peiling Xie
- Departments of Breast Surgery, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, People’s Republic of China
| | - Rulan Ma
- Departments of Surgical Oncology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, People’s Republic of China
| | - Jianjun He
- Departments of Breast Surgery, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, People’s Republic of China
- * E-mail: (JH); (HZ)
| | - Huimin Zhang
- Departments of Breast Surgery, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, People’s Republic of China
- * E-mail: (JH); (HZ)
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14
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Kaida A, Iwakuma T. Regulation of p53 and Cancer Signaling by Heat Shock Protein 40/J-Domain Protein Family Members. Int J Mol Sci 2021; 22:13527. [PMID: 34948322 PMCID: PMC8706882 DOI: 10.3390/ijms222413527] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/13/2021] [Accepted: 12/14/2021] [Indexed: 12/27/2022] Open
Abstract
Heat shock proteins (HSPs) are molecular chaperones that assist diverse cellular activities including protein folding, intracellular transportation, assembly or disassembly of protein complexes, and stabilization or degradation of misfolded or aggregated proteins. HSP40, also known as J-domain proteins (JDPs), is the largest family with over fifty members and contains highly conserved J domains responsible for binding to HSP70 and stimulation of the ATPase activity as a co-chaperone. Tumor suppressor p53 (p53), the most frequently mutated gene in human cancers, is one of the proteins that functionally interact with HSP40/JDPs. The majority of p53 mutations are missense mutations, resulting in acquirement of unexpected oncogenic activities, referred to as gain of function (GOF), in addition to loss of the tumor suppressive function. Moreover, stability and levels of wild-type p53 (wtp53) and mutant p53 (mutp53) are crucial for their tumor suppressive and oncogenic activities, respectively. However, the regulatory mechanisms of wtp53 and mutp53 are not fully understood. Accumulating reports demonstrate regulation of wtp53 and mutp53 levels and/or activities by HSP40/JDPs. Here, we summarize updated knowledge related to the link of HSP40/JDPs with p53 and cancer signaling to improve our understanding of the regulation of tumor suppressive wtp53 and oncogenic mutp53 GOF activities.
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Affiliation(s)
- Atsushi Kaida
- Department of Oral Radiation Oncology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8510, Japan;
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Tomoo Iwakuma
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA
- Department of Pediatrics, Children’s Mercy Research Institute, Kansas City, MO 64108, USA
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15
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Kabakov AE, Gabai VL. HSP70s in Breast Cancer: Promoters of Tumorigenesis and Potential Targets/Tools for Therapy. Cells 2021; 10:cells10123446. [PMID: 34943954 PMCID: PMC8700403 DOI: 10.3390/cells10123446] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 11/25/2021] [Accepted: 12/03/2021] [Indexed: 12/20/2022] Open
Abstract
The high frequency of breast cancer worldwide and the high mortality among women with this malignancy are a serious challenge for modern medicine. A deeper understanding of the mechanisms of carcinogenesis and emergence of metastatic, therapy-resistant breast cancers would help development of novel approaches to better treatment of this disease. The review is dedicated to the role of members of the heat shock protein 70 subfamily (HSP70s or HSPA), mainly inducible HSP70, glucose-regulated protein 78 (GRP78 or HSPA5) and GRP75 (HSPA9 or mortalin), in the development and pathogenesis of breast cancer. Various HSP70-mediated cellular mechanisms and pathways which contribute to the oncogenic transformation of mammary gland epithelium are reviewed, as well as their role in the development of human breast carcinomas with invasive, metastatic traits along with the resistance to host immunity and conventional therapeutics. Additionally, intracellular and cell surface HSP70s are considered as potential targets for therapy or sensitization of breast cancer. We also discuss a clinical implication of Hsp70s and approaches to targeting breast cancer with gene vectors or nanoparticles downregulating HSP70s, natural or synthetic (small molecule) inhibitors of HSP70s, HSP70-binding antibodies, HSP70-derived peptides, and HSP70-based vaccines.
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Affiliation(s)
- Alexander E. Kabakov
- Department of Radiation Biochemistry, A. Tsyb Medical Radiological Research Center—Branch of the National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, Koroleva 4, 249036 Obninsk, Russia;
| | - Vladimir L. Gabai
- CureLab Oncology Inc., Dedham, MA 02026, USA
- Correspondence: ; Tel.: +1-617-319-7314
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16
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Hosfelt J, Richards A, Zheng M, Adura C, Nelson B, Yang A, Fay A, Resager W, Ueberheide B, Glickman JF, Lupoli TJ. An allosteric inhibitor of bacterial Hsp70 chaperone potentiates antibiotics and mitigates resistance. Cell Chem Biol 2021; 29:854-869.e9. [PMID: 34818532 DOI: 10.1016/j.chembiol.2021.11.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Revised: 09/20/2021] [Accepted: 11/02/2021] [Indexed: 12/23/2022]
Abstract
DnaK is the bacterial homolog of Hsp70, an ATP-dependent chaperone that helps cofactor proteins to catalyze nascent protein folding and salvage misfolded proteins. In the pathogen Mycobacterium tuberculosis, the causative agent of tuberculosis (TB), DnaK and its cofactors are proposed antimycobacterial targets, yet few small-molecule inhibitors or probes exist for these families of proteins. Here, we describe the repurposing of a drug called telaprevir that is able to allosterically inhibit the ATPase activity of DnaK and to prevent chaperone function by mimicking peptide substrates. In mycobacterial cells, telaprevir disrupts DnaK- and cofactor-mediated cellular proteostasis, resulting in enhanced efficacy of aminoglycoside antibiotics and reduced resistance to the frontline TB drug rifampin. Hence, this work contributes to a small but growing collection of protein chaperone inhibitors, and it demonstrates that these molecules disrupt bacterial mechanisms of survival in the presence of different antibiotic classes.
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Affiliation(s)
- Jordan Hosfelt
- Department of Chemistry, New York University, New York, NY 10003, USA
| | - Aweon Richards
- Department of Chemistry, New York University, New York, NY 10003, USA
| | - Meng Zheng
- Department of Chemistry, New York University, New York, NY 10003, USA
| | - Carolina Adura
- High-Throughput and Spectroscopy Resource Center, The Rockefeller University, New York, NY 10065, USA
| | - Brock Nelson
- Department of Chemistry, New York University, New York, NY 10003, USA
| | - Amy Yang
- Department of Chemistry, New York University, New York, NY 10003, USA
| | - Allison Fay
- Immunology Program, Sloan Kettering Insitute, New York, NY 10065, USA
| | - William Resager
- Departments of Biochemistry and Molecular Pharmacology, Neurology and Director Proteomics Lab, Division of Advanced Research Technologies, NYU Grossman School of Medicine, New York, NY 10016, USA
| | - Beatrix Ueberheide
- Departments of Biochemistry and Molecular Pharmacology, Neurology and Director Proteomics Lab, Division of Advanced Research Technologies, NYU Grossman School of Medicine, New York, NY 10016, USA
| | - J Fraser Glickman
- High-Throughput and Spectroscopy Resource Center, The Rockefeller University, New York, NY 10065, USA
| | - Tania J Lupoli
- Department of Chemistry, New York University, New York, NY 10003, USA.
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17
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Knighton LE, Nitika, Wani TH, Truman AW. Chemogenomic and bioinformatic profiling of ERdj paralogs underpins their unique roles in cancer. Cell Stress Chaperones 2021; 27:135-147. [PMID: 35129801 PMCID: PMC8943095 DOI: 10.1007/s12192-022-01256-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 01/17/2022] [Accepted: 01/22/2022] [Indexed: 12/22/2022] Open
Abstract
The ER-resident Hsp70 paralog BiP is important in cellular homeostasis as well as in cancer cell progression. Although several BiP inhibitors have been developed, they have not succeeded in clinical trials due to toxicity issues. ER-resident co-chaperones (ERdjs) tailor the activity and specificity of BiP. Here, we report multiple-cancer analyses of BiP and ERdj genomic alterations including mRNA expression from cancer patients using available data from The Cancer Genome Atlas (TCGA). We examine the individual roles of BiP co-chaperones ERdj1-8 in mediating anticancer drug resistance through chemogenomic screening of ERdj1-8 CRISPR KO cells. In keeping with the idea that ERdjs regulate distinct facets of proteostasis, we find that each ERdj KO displays a unique signature of drug resistance. Taken together, our results demonstrate a novel way to understand functional specificity of ERdjs, suggesting a future personalized medicine approach, whereby ERdj mutation status is assessed to design an effective anticancer treatment plan.
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Affiliation(s)
- Laura E Knighton
- Department of Biological Sciences, University of North Carolina Charlotte, Charlotte, NC, 28223, USA
| | - Nitika
- Department of Biological Sciences, University of North Carolina Charlotte, Charlotte, NC, 28223, USA
| | - Tasaduq H Wani
- Department of Biological Sciences, University of North Carolina Charlotte, Charlotte, NC, 28223, USA
| | - Andrew W Truman
- Department of Biological Sciences, University of North Carolina Charlotte, Charlotte, NC, 28223, USA.
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18
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van Oosten-Hawle P, Bergink S, Blagg B, Brodsky J, Edkins A, Freeman B, Genest O, Hendershot L, Kampinga H, Johnson J, De Maio A, Masison D, Morano K, Multhoff G, Prodromou C, Prahlad V, Scherz-Shouval R, Zhuravleva A, Mollapour M, Truman AW. First Virtual International Congress on Cellular and Organismal Stress Responses, November 5-6, 2020. Cell Stress Chaperones 2021; 26:289-295. [PMID: 33559835 PMCID: PMC7871303 DOI: 10.1007/s12192-021-01192-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/2021] [Indexed: 11/29/2022] Open
Abstract
Members of the Cell Stress Society International (CSSI), Patricija van Oosten-Hawle (University of Leeds, UK), Mehdi Mollapour (SUNY Upstate Medical University, USA), Andrew Truman (University of North Carolina at Charlotte, USA) organized a new virtual meeting format which took place on November 5-6, 2020. The goal of this congress was to provide an international platform for scientists to exchange data and ideas among the Cell Stress and Chaperones community during the Covid-19 pandemic. Here we will highlight the summary of the meeting and acknowledge those who were honored by the CSSI.
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Affiliation(s)
- Patricija van Oosten-Hawle
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, LS2 9JT, UK.
| | - Steven Bergink
- Department of Biomedical Sciences of Cells and Systems, University Medical Center Groningen, Groningen, AV, 9713, The Netherlands
| | - Brian Blagg
- Department of Chemistry & Biochemistry, College of Science, University of Notre Dame, Notre Dame, IN, USA
| | - Jeff Brodsky
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA
| | - Adrienne Edkins
- Biomedical Biotechnology Research Unit, Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, 6140, South Africa
- Centre for Chemico- and Biomedicinal Research, Rhodes University, Grahamstown, 6140, South Africa
| | - Brian Freeman
- Department of Cell and Developmental Biology, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Olivier Genest
- Aix Marseille University, CNRS, BIP UMR, 7281, Marseille, France
| | - Linda Hendershot
- Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Harm Kampinga
- Department of Cell Biology, University of Groningen, University Medical Center Groningen, Ant. Deusinglaan 1, 9713, AV, Groningen, The Netherlands
| | - Jill Johnson
- Department of Biological Sciences and the Center for Reproductive Biology, University of Idaho, Moscow, ID, 83844, USA
| | - Antonio De Maio
- Division of Trauma, Critical Care, Burns and Acute Care Surgery, Department of Surgery, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
- Department of Neurosciences, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
| | - Dan Masison
- Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 8 Center Dr, Room 324, Bethesda, MD, 20892, USA
| | - Kevin Morano
- Department of Microbiology and Molecular Genetics, University of Texas Medical School at Houston, Houston, TX, 77030, USA
| | - Gabriele Multhoff
- Radiation Immuno-Oncology Group, Center for Translational Cancer Research (TranslaTUM), Technical University of Munich (TUM), 81675, Munich, Germany
- Department of Radiation Oncology, School of Medicine, Technical University of Munich (TUM), 81675, Munich, Germany
| | - Chris Prodromou
- Genome Damage and Stability Centre, University of Sussex, Brighton, BN1 9RQ, UK
| | - Veena Prahlad
- Department of Biology, Aging Mind and Brain Initiative, University of Iowa, Iowa City, IA, USA
- Iowa Neuroscience Institute, University of Iowa, Iowa City, IA, USA
| | - Ruth Scherz-Shouval
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot, Israel
| | - Anastasia Zhuravleva
- School of Molecular and Cell Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, LS2 9JT, UK
| | - Mehdi Mollapour
- Department of Urology, SUNY Upstate Medical University, Syracuse, NY, 13210, USA.
- Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, NY, 13210, USA.
- Upstate Cancer Center, SUNY Upstate Medical University, Syracuse, NY, 13210, USA.
| | - Andrew W Truman
- Department of Biological Sciences, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA.
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19
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Abstract
The importance of molecular chaperones in cancer is well established, yet several chaperone inhibitors have failed in clinical trials due to toxicity. Recent efforts have focused on targeting chaperone function in cancer by either manipulating the “chaperone code” or inhibiting helper cochaperones, such as DNAJA1. Tong et al. identify a novel inhibitor that specifically disrupts DNAJA1's interaction with p53, promoting p53 degradation. This finding highlights specific DNAJA1 interactions with the potential for less toxicity compared to traditional chaperone inhibitors.
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