{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nEosinophil PRG2—the gene encoding the prototypical eosinophil granule major basic protein (MBP)—is subject to precise transcriptional regulation during eosinophil differentiation. For example, studies have shown that lineage‐specific transcription factors such as GATA‑1 and PU.1 act in concert to transactivate the MBP gene, whereas certain isoforms of C/EBPε serve as potent repressors, thereby establishing a tightly controlled program for MBP expression in developing eosinophils."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond transcriptional control, PRG2 product function is modulated through its interactions with other proteins. Several investigations have demonstrated that MBP (or its proform, proMBP) forms covalent complexes with the metalloproteinase PAPP‑A—complex formation that involves specific disulfide bonding—and thereby serves as an inhibitor regulating IGF bioavailability. This regulatory complex, which is highly relevant in reproductive biology and acute coronary syndromes, is mapped to distinct short consensus repeats in PAPP‑A and is sensitive to redox conditions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "2", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIntracellularly, PRG2 product is packaged into the crystalloid cores of eosinophil granules in a highly ordered nanocrystalline form that restrains its innate toxicity. Upon appropriate stimulation, eosinophils mobilize MBP via vesicular transport (piecemeal degranulation) so that both granule‐stored and vesicle‐associated pools are available for secretion; such regulated release mechanisms are crucial for ensuring that extracellular MBP exerts its biological functions only under tightly controlled conditions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nOnce secreted, MBP performs key cytotoxic and immunomodulatory functions. It can directly trigger the activation of neutrophils through signaling cascades involving PI3‑kinase, Akt and atypical PKC, and also stimulate mast cells in the context of allergic cross‐talk. In respiratory epithelia, MBP synergizes with pathogens (e.g. respiratory syncytial virus) to provoke cell death and the release of pro‐inflammatory cytokines, while in other tissues MBP contributes to local tissue damage and remodeling in conditions such as eosinophilic myositis, atopic cataracts and chronic rhinosinusitis. Moreover, MBP binding to cell‐surface heparan sulfate proteoglycans via discrete surface‐exposed residues further suggests its role as an intercellular signal modulator in inflammatory settings."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its classical effector roles in allergic inflammation, emerging evidence indicates that PRG2 expression may also function as a biomarker and exert tumor‐suppressive effects in certain contexts. For instance, in imatinib‐resistant chronic myeloproliferative cells, forced PRG2 overexpression (along with associated hypomethylation) has been linked to inactivation of STAT3 and enhanced sensitivity to the drug, suggesting a potential tumor suppressor role. Similarly, alterations in circulating proMBP levels have been observed in hematologic disorders."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "24"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, in the context of obstetrics, upregulated and mislocalized PRG2 expression in extraembryonic tissues—including the fetal membranes and placental disk—has been associated with conditions of abnormal trophoblast invasion such as placenta previa and placenta accreta spectrum, implying that PRG2 may serve as a marker for increased invasiveness in these pathologies."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "25"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Jian Du, Monika J Stankiewicz, Yang Liu, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Novel combinatorial interactions of GATA-1, PU.1, and C/EBPepsilon isoforms regulate transcription of the gene encoding eosinophil granule major basic protein."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M204777200"}], "href": "https://doi.org/10.1074/jbc.M204777200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12202480"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12202480"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Lisbeth S Laursen, Michael T Overgaard, Kathrin Weyer, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Cell surface targeting of pregnancy-associated plasma protein A proteolytic activity. Reversible adhesion is mediated by two neighboring short consensus repeats."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M209155200"}], "href": "https://doi.org/10.1074/jbc.M209155200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12370176"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12370176"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Michael T Overgaard, Esben S Sorensen, Damian Stachowiak, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Complex of pregnancy-associated plasma protein-A and the proform of eosinophil major basic protein. Disulfide structure and carbohydrate attachment."}]}, {"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.M208777200"}], "href": "https://doi.org/10.1074/jbc.M208777200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12421832"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12421832"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Michael T Overgaard, Simon Glerup, Henning B Boldt, et al. 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