{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent studies indicate that the UBALD2 protein (also known as SODD or BAG-4) can be linked to cytoprotective signaling events in hepatocytes. In one investigation, activation of the constitutive androstane receptor (CAR) in wild‐type mice was shown to protect against Fas-induced liver injury by promoting antiapoptotic Mcl-1 expression while depleting proapoptotic factors such as Bax and Bak. This mechanism of hepatoprotection suggests that pathways regulated by UBALD2-related proteins may contribute to cellular survival under toxic challenge."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of death receptor signaling, UBALD2 (SODD/BAG-4) has been demonstrated to modulate tumor necrosis factor receptor type 1 (TNFR1) and CD95 receptor activities. Studies in cells overexpressing SODD/BAG-4 as well as in mice lacking SODD have revealed that this co-chaperone can influence the kinetics and magnitude of NF-κB activation and cytokine production. Although some data implicate SODD/BAG-4 in controlling the recruitment of signaling molecules to TNFR1 and CD95, the overall sensitivity of cells to TNF- or CD95-induced apoptosis appears only subtly affected, linking UBALD2 function to fine-tuning rather than on–off switching of death receptor cascades."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "2", "end_ref": "4"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAnother critical role for UBALD2 involves post‐transcriptional regulation through its interaction with apobec-1, the catalytic subunit responsible for apolipoprotein B mRNA editing. UBALD2 (BAG-4/SODD) binds apobec-1 independently of its BAG domain and appears to modulate the assembly of the editosome complex by interfering with the Hsp/Hsc70 chaperone system. This interaction shuttles apobec-1 away from the nuclear perinucleolar compartment and results in downregulation of apoB mRNA editing, emphasizing a role for UBALD2 as a negative regulator in this mRNA processing event."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nUBALD2 is also emerging as an important regulator of cytoskeletal dynamics through its modulation of phosphoinositide signaling. By forming complexes with several 5-phosphatases, including SKIP, SHIP1, and SHIP2, UBALD2 inhibits their phosphatidylinositol 3,4,5-trisphosphate (PI(3,4,5)P3) 5-phosphatase activity. This action enhances PI3K/Akt signaling, thereby promoting the recruitment of Akt and subsequent actin cytoskeletal remodeling, F-actin stress fiber formation, and focal adhesion complexity. Such changes are critical for directional cell migration, reinforcing a role for UBALD2 in the regulation of cell motility."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, emerging evidence suggests that UBALD2 (SODD/BAG-4) may serve as a tumor marker and play a role in carcinogenesis. Overexpression of this protein has been associated with tumor occurrence, progression, and drug resistance, with studies particularly highlighting its potential involvement in lung cancer. Such findings point to UBALD2 not only as a regulator of key cell survival and signaling pathways but also as a possible contributor to oncogenic processes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Edwina S Baskin-Bey, Wendong Huang, Norihisa Ishimura, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Constitutive androstane receptor (CAR) ligand, TCPOBOP, attenuates Fas-induced murine liver injury by altering Bcl-2 proteins."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hepatology (2006)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/hep.21236"}], "href": "https://doi.org/10.1002/hep.21236"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16799968"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16799968"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Hidetoshi Takada, Nien-Jung Chen, Christine Mirtsos, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Role of SODD in regulation of tumor necrosis factor responses."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell Biol (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1128/MCB.23.11.4026-4033.2003"}], "href": "https://doi.org/10.1128/MCB.23.11.4026-4033.2003"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12748303"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12748303"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Hedda Eichholtz-Wirth, Eberhard Fritz, Lucie Wolz "}, {"type": "b", "children": [{"type": "t", "text": "Overexpression of the 'silencer of death domain', SODD/BAG-4, modulates both TNFR1- and CD95-dependent cell death pathways."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cancer Lett (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/s0304-3835(03)00009-0"}], "href": "https://doi.org/10.1016/s0304-3835(03"}, {"type": "t", "text": "00009-0) PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12706861"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12706861"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Robert Endres, Georg Häcker, Inge Brosch, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Apparently normal tumor necrosis factor receptor 1 signaling in the absence of the silencer of death domains."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell Biol (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1128/MCB.23.18.6609-6617.2003"}], "href": "https://doi.org/10.1128/MCB.23.18.6609-6617.2003"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12944486"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12944486"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Paul P Lau, Lawrence Chan "}, {"type": "b", "children": [{"type": "t", "text": "Involvement of a chaperone regulator, Bcl2-associated athanogene-4, in apolipoprotein B mRNA editing."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M310153200"}], "href": "https://doi.org/10.1074/jbc.M310153200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "14559896"}], "href": "https://pubmed.ncbi.nlm.nih.gov/14559896"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Parvin Rahman, Richard D Huysmans, Fenny Wiradjaja, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Silencer of death domains (SODD) inhibits skeletal muscle and kidney enriched inositol 5-phosphatase (SKIP) and regulates phosphoinositide 3-kinase (PI3K)/Akt signaling to the actin cytoskeleton."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M111.263103"}], "href": "https://doi.org/10.1074/jbc.M111.263103"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21712384"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21712384"}]}, {"type": "r", "ref": 7, "children": [{"type": "t", "text": "Fan Bao, Su An, Yang Yang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "SODD Promotes Lung Cancer Tumorigenesis by Activating the PDK1/AKT and RAF/MEK/ERK Signaling."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Genes (Basel) (2023)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.3390/genes14040829"}], "href": "https://doi.org/10.3390/genes14040829"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "37107587"}], "href": "https://pubmed.ncbi.nlm.nih.gov/37107587"}]}]}]}