{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nAlthough the query asks for a summary of NPIPA1 function, none of the provided abstracts describe or even mention NPIPA1. Rather, the collection of studies focuses predominantly on two sets of molecules: one group composed of Apolipoprotein D (ApoD), a secreted lipocalin involved in neuroprotection, lipid metabolism, and cellular defense against oxidative stress; and another group comprised of transmembrane adaptor proteins such as Cbp/PAG (Csk‐binding protein/PAG1), which plays key roles in recruiting regulatory kinases (e.g., Csk) to membrane lipid rafts to modulate Src family kinase activity in immune, neural, and other cell types."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}, {"type": "p", "children": [{"type": "t", "text": "\nThe ApoD‐focused studies describe its multifaceted functions: ApoD is rapidly up‐regulated by oxidative or injury‐related insults in both the central and peripheral nervous systems, where it confers protection by controlling lipid peroxidation and promoting cellular homeostasis. In addition, ApoD modulates triglyceride metabolism, contributes to myelin compaction, and—even in disease models such as Alzheimer’s or Niemann–Pick type A—its levels correlate with neuroprotective and cardioprotective outcomes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}, {"type": "fg_fs", "start_ref": "3", "end_ref": "7"}]}, {"type": "t", "text": ""}, {"type": "p", "children": [{"type": "t", "text": "\nIn parallel, the studies on Cbp/PAG reveal that these adaptor molecules function as critical modulators of Src family kinase signaling. By virtue of their tyrosine phosphorylation and capacity to recruit Csk, they act as negative regulators of T‑cell receptor responses and, in other cell types, they influence oncogenic pathways by sequestering active kinases within lipid raft microdomains. Moreover, these proteins have been linked to broader roles in developmental signaling, hematopoietic stem cell fate, and even as partners in cell adhesion‐dependent tumor suppression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}, {"type": "fg_fs", "start_ref": "8", "end_ref": "13"}]}, {"type": "t", "text": ""}, {"type": "p", "children": [{"type": "t", "text": "\nIn summary, while these abstracts provide a rich picture of the protective and regulatory functions of ApoD and the modulatory roles of Cbp/PAG in diverse biological processes ranging from neural integrity and lipid homeostasis to immune regulation and cancer biology, they do not offer any information about NPIPA1. Consequently, no functional attributes for NPIPA1 can be extracted from the current literature provided."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}]}]}]}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Maria D Ganfornina, Sonia Do Carmo, Jose M Lora, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Apolipoprotein D is involved in the mechanisms regulating protection from oxidative stress."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Aging Cell (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1111/j.1474-9726.2008.00395.x"}], "href": "https://doi.org/10.1111/j.1474-9726.2008.00395.x"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18419796"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18419796"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Dominique Davidson, Marcin Bakinowski, Matthew L Thomas, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Phosphorylation-dependent regulation of T-cell activation by PAG/Cbp, a lipid raft-associated transmembrane adaptor."}]}, {"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.23.6.2017-2028.2003"}], "href": "https://doi.org/10.1128/MCB.23.6.2017-2028.2003"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12612075"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12612075"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Maria D Ganfornina, Sonia Do Carmo, Eva Martínez, et al. "}, {"type": "b", "children": [{"type": "t", "text": "ApoD, a glia-derived apolipoprotein, is required for peripheral nerve functional integrity and a timely response to injury."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Glia (2010)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/glia.21010"}], "href": "https://doi.org/10.1002/glia.21010"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "20607718"}], "href": "https://pubmed.ncbi.nlm.nih.gov/20607718"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "German Perdomo, Dae Hyun Kim, Ting Zhang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "A role of apolipoprotein D in triglyceride metabolism."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Lipid Res (2010)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1194/jlr.M001206"}], "href": "https://doi.org/10.1194/jlr.M001206"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "20124557"}], "href": "https://pubmed.ncbi.nlm.nih.gov/20124557"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Hongyun Li, Kalani Ruberu, Sonia Sanz Muñoz, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Apolipoprotein D modulates amyloid pathology in APP/PS1 Alzheimer's disease mice."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Neurobiol Aging (2015)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.neurobiolaging.2015.02.010"}], "href": "https://doi.org/10.1016/j.neurobiolaging.2015.02.010"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "25784209"}], "href": "https://pubmed.ncbi.nlm.nih.gov/25784209"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Hongyun Li, Kalani Ruberu, Tim Karl, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Cerebral Apolipoprotein-D Is Hypoglycosylated Compared to Peripheral Tissues and Is Variably Expressed in Mouse and Human Brain Regions."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "PLoS One (2016)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1371/journal.pone.0148238"}], "href": "https://doi.org/10.1371/journal.pone.0148238"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "26829325"}], "href": "https://pubmed.ncbi.nlm.nih.gov/26829325"}]}, {"type": "r", "ref": 7, "children": [{"type": "t", "text": "Eva Martínez, Ana Navarro, Cristina Ordóñez, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Amyloid-β25-35 induces apolipoprotein D Synthesis and growth arrest in HT22 hippocampal cells."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Alzheimers Dis (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.3233/JAD-2012-112102"}], "href": "https://doi.org/10.3233/JAD-2012-112102"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22398376"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22398376"}]}, {"type": "r", "ref": 8, "children": [{"type": "t", "text": "Chitose Oneyama, Tomoya Hikita, Kengo Enya, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The lipid raft-anchored adaptor protein Cbp controls the oncogenic potential of c-Src."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.molcel.2008.03.026"}], "href": "https://doi.org/10.1016/j.molcel.2008.03.026"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18498747"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18498747"}]}, {"type": "r", "ref": 9, "children": [{"type": "t", "text": "Marc-Werner Dobenecker, Christian Schmedt, Masato Okada, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The ubiquitously expressed Csk adaptor protein Cbp is dispensable for embryogenesis and T-cell development and function."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell Biol (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1128/MCB.25.23.10533-10542.2005"}], "href": "https://doi.org/10.1128/MCB.25.23.10533-10542.2005"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16287865"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16287865"}]}, {"type": "r", "ref": 10, "children": [{"type": "t", "text": "Yun Chen, Laurence Veracini, Christine Benistant, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The transmembrane protein CBP plays a role in transiently anchoring small clusters of Thy-1, a GPI-anchored protein, to the cytoskeleton."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Cell Sci (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1242/jcs.049346"}], "href": "https://doi.org/10.1242/jcs.049346"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19825940"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19825940"}]}, {"type": "r", "ref": 11, "children": [{"type": "t", "text": "Kei Suzuki, Chitose Oneyama, Hironobu Kimura, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Down-regulation of the tumor suppressor C-terminal Src kinase (Csk)-binding protein (Cbp)/PAG1 is mediated by epigenetic histone modifications via the mitogen-activated protein kinase (MAPK)/phosphatidylinositol 3-kinase (PI3K) pathway."}]}, {"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.M110.195362"}], "href": "https://doi.org/10.1074/jbc.M110.195362"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21388951"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21388951"}]}, {"type": "r", "ref": 12, "children": [{"type": "t", "text": "Lubica Draberova, Viktor Bugajev, Lucie Potuckova, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Transmembrane adaptor protein PAG/CBP is involved in both positive and negative regulation of mast cell signaling."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell Biol (2014)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1128/MCB.00983-14"}], "href": "https://doi.org/10.1128/MCB.00983-14"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "25246632"}], "href": "https://pubmed.ncbi.nlm.nih.gov/25246632"}]}, {"type": "r", "ref": 13, "children": [{"type": "t", "text": "Janice H C Plani-Lam, Neli S Slavova-Azmanova, Nicole Kucera, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Csk-binding protein controls red blood cell development via regulation of Lyn tyrosine kinase activity."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Exp Hematol (2017)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.exphem.2016.10.001"}], "href": "https://doi.org/10.1016/j.exphem.2016.10.001"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "27751872"}], "href": "https://pubmed.ncbi.nlm.nih.gov/27751872"}]}]}]}