{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nAlthough none of the provided abstracts explicitly mention MIR3617, a review of these studies reveals that the gene product most consistently discussed—the activin βB subunit (encoded by Inhbb)—functions as a versatile modulator in numerous tissues. Activin βB is implicated in systemic growth and differentiation, as demonstrated by studies showing that balanced expression of activin β subunits is essential for normal somatic growth and viability."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In endocrine contexts, activin βB critically participates in the regulation of steroidogenic gene expression and insulin secretion in pancreatic islets, where it acts via receptors such as ALK7 to modulate Ca²⁺ signaling and insulin release."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn reproductive and neural systems, activin βB exerts a negative regulatory influence. In the fetal ovary, for example, it is normally repressed by WNT4/β‑catenin signaling to ensure female germ cell survival"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", while in the olfactory epithelium it inhibits the expansion of early progenitor cells and helps determine glial versus neuronal fate."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Moreover, hepatic production of hepcidin is markedly up‐regulated by activin βB during inflammation"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ", and its absence can alter islet cell composition in the pancreas."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " In granulosa cells, proper levels of activin βB are required for cell cycle progression and steroid hormone biosynthesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond these roles, activin βB has been shown to promote oligodendrocyte maturation in the embryonic central nervous system"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "and to drive β‐cell dedifferentiation in pancreatic tumor models."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " Its function in the testis is multifaceted—chronic hyperglycemia and inflammatory conditions are associated with imbalances in activin signaling that disrupt testicular homeostasis"}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "16"}]}, {"type": "t", "text": ", and genetic variants affecting INHBB can shift testicular cell composition."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": " \n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nCollectively, these data underscore the critical role of activin βB in regulating cellular processes as diverse as inflammatory responses, differentiation, proliferation, and fibrotic remodeling. Although MIR3617 is not directly addressed in these abstracts, its potential implication as a modulator of activin βB signaling—by influencing the post‐transcriptional regulation of Inhbb or its downstream pathways—remains an intriguing prospect for further investigation.\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Chester W Brown, Liunan Li, Dianne E Houston-Hawkins, et al. 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