Affinage

NRSN2

Neurensin-2 · UniProt Q9GZP1

Length
204 aa
Mass
22.0 kDa
Annotated
2026-06-10
16 papers in source corpus 12 papers cited in narrative 12 extracted findings
Cross-family judge faithfulness: 5/5 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

NRSN2 (Neurensin-2) is a small protein that functions predominantly as a pro-proliferative factor across diverse epithelial and mesenchymal cancers, where it couples upstream transcriptional and microRNA regulation to multiple growth-promoting signaling cascades (PMID:26045763, PMID:28401012, PMID:35662041). In non-small cell lung, osteosarcoma, breast, esophageal squamous cell carcinoma (ESCC), and other tumor cells, NRSN2 gain- and loss-of-function drives proliferation, migration, and invasion through activation of PI3K/AKT/mTOR signaling, frequently in concert with Wnt/β-catenin, NF-κB, ERK1/2-Bcl-xL, or AMPK/ULK1-mediated autophagy (PMID:26045763, PMID:28401012, PMID:31885716, PMID:35730574, PMID:38569536). Its expression is controlled at two levels: direct transcriptional activation by E2F1 in ESCC (PMID:35662041), and post-transcriptional repression by multiple microRNAs (miR-143, miR-206, miR-1913, miR-6785-5p) that are themselves modulated by lncRNA ceRNA networks delivered via mesenchymal stem cell-derived extracellular vesicles (PMID:33564242, PMID:34650689, PMID:35730574, PMID:38457049). Notably, in hepatocellular carcinoma NRSN2 acts in the opposite direction, suppressing proliferation and promoting senescence and apoptosis via the p53/p21 axis, indicating context-dependent function (PMID:26055238). Beyond cancer, knockout mice reveal a neuronal role: loss of NRSN2 alters functional brain network connectivity in sensory and default mode network regions without gross structural change (PMID:39723223). The biochemical activity of the NRSN2 protein itself—its molecular partners and the mechanism by which it engages these signaling pathways—has not been characterized in the available corpus.

Mechanistic history

Synthesis pass · year-by-year structured walk · 9 steps
  1. 2015 Medium

    Established NRSN2 as a functional driver of cancer cell growth and linked it to a specific signaling cascade, defining its first mechanistic role.

    Evidence Loss- and gain-of-function assays with pathway western blots in NSCLC cell lines

    PMID:26045763

    Open questions at the time
    • Does not show direct molecular activity of NRSN2 on PI3K/Akt components
    • Single cell-line context, no in vivo data
    • Effect on invasion not observed
  2. 2015 Medium

    Revealed that NRSN2 function is context-dependent, acting as a growth suppressor in hepatocellular carcinoma rather than a uniform oncogene.

    Evidence Proliferation, senescence (SA-β-gal), and apoptosis assays with p53/p21 and PI3K/AKT western blots in HCC cell lines

    PMID:26055238

    Open questions at the time
    • Mechanism underlying opposite directionality versus other cancers unresolved
    • No direct interaction with p53/p21 demonstrated
    • Single lab
  3. 2016 Medium

    Extended NRSN2's oncogenic repertoire to invasion, chemoresistance, and stemness, broadening its phenotypic scope beyond proliferation.

    Evidence Anchorage-independent growth, invasion, tumor formation, CD133 correlation, and Wnt/Akt/Erk western blots in ovarian cancer cells

    PMID:27908706

    Open questions at the time
    • Multiple pathways implicated without identifying primary effector
    • No upstream regulator defined
    • Single lab
  4. 2017 Medium

    Showed NRSN2 simultaneously dysregulates two canonical pathways in vivo, consolidating its pro-growth role in osteosarcoma.

    Evidence In vitro and in vivo KD/OE with PI3K/AKT/mTOR and Wnt/β-catenin western blots in osteosarcoma

    PMID:28401012

    Open questions at the time
    • Hierarchy between the two pathways not resolved
    • No direct molecular mechanism of activation
    • Single lab
  5. 2019 Medium

    Added NF-κB to the set of NRSN2-activated cascades and confirmed pro-metastatic activity in vivo in breast cancer.

    Evidence MTT, in vivo xenograft, PI3K/AKT/mTOR and NF-κB western blots in breast cancer cells

    PMID:31885716

    Open questions at the time
    • Direct link between NRSN2 and NF-κB activation not shown
    • No partner identified
    • Single lab
  6. 2021 Medium

    Identified the first upstream regulatory layer, showing NRSN2 is a direct microRNA target embedded in extracellular-vesicle-delivered lncRNA ceRNA networks.

    Evidence Dual luciferase validation of miR-143 and miR-1913 targeting NRSN2, with EV/exosome delivery and rescue in osteosarcoma

    PMID:33564242 PMID:34650689

    Open questions at the time
    • Whether NRSN2 protein output is the sole effector of these axes unclear
    • Generalizability beyond osteosarcoma untested
    • Single lab per axis
  7. 2022 Medium

    Defined the ERK1/2-Bcl-xL pathway as an NRSN2 effector and established a complete transcriptional control point via E2F1.

    Evidence Dual luciferase and ChIP showing E2F1 transcribes NRSN2 in ESCC; miR-206/EV experiments linking NRSN2 to ERK1/2-Bcl-xL in osteosarcoma

    PMID:35662041 PMID:35730574

    Open questions at the time
    • How NRSN2 physically engages ERK1/2 or Bcl-xL unknown
    • E2F1 regulation shown only in ESCC
    • Single lab per study
  8. 2024 Medium

    Connected NRSN2 to autophagy regulation through AMPK/ULK1 and reinforced the ESCC ceRNA axis with an additional lncRNA-miRNA pair.

    Evidence AMPK/ULK1 pathway inhibition and autophagosome TEM in HPV-laryngeal carcinoma; luciferase and rescue for LUESCC/miR-6785-5p/NRSN2 in ESCC

    PMID:38457049 PMID:38569536

    Open questions at the time
    • Direct molecular mechanism linking NRSN2 to AMPK activation absent
    • Whether autophagy is cause or consequence of malignancy unclear
    • Single lab per study
  9. 2024 Medium

    Provided the first in vivo evidence of an endogenous neuronal function, implicating NRSN2 in functional brain network connectivity.

    Evidence 11.7 T multimodal structural and functional MRI in Nrsn2 knockout versus wild-type mice

    PMID:39723223

    Open questions at the time
    • Cellular/molecular basis of connectivity changes not defined
    • No behavioral correlation established
    • Relationship to its cancer signaling roles unknown

Open questions

Synthesis pass · forward-looking unresolved questions
  • The intrinsic biochemical activity of the NRSN2 protein and its direct molecular partners remain undefined, leaving open how it mechanistically engages the many signaling pathways attributed to it.
  • No direct physical interactor identified
  • No structural or biochemical characterization
  • Context-dependent oncogene-versus-suppressor switch unexplained

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Pathway
R-HSA-162582 Signal Transduction 5 R-HSA-112316 Neuronal System 1 R-HSA-9612973 Autophagy 1

Evidence

Reading pass · 12 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2015 NRSN2 promotes non-small cell lung cancer cell growth through the PI3K/Akt/mTOR signaling pathway, as demonstrated by loss- and gain-of-function experiments in NSCLC cell lines showing effects on cell growth but not invasion. Loss- and gain-of-function assays in NSCLC cell lines, western blot for pathway components International journal of clinical and experimental pathology Medium 26045763
2015 NRSN2 inhibits hepatocellular carcinoma cell proliferation and promotes senescence and apoptosis by regulating PI3K/AKT signaling and the p53/p21 pathway, as shown by loss- and gain-of-function assays. CCK-8 assays, SA-β-gal staining, Annexin V/PI staining, western blot for PI3K/AKT and p53/p21 pathway components; loss- and gain-of-function in HCC cell lines Digestive diseases and sciences Medium 26055238
2016 NRSN2 promotes malignant phenotype in ovarian cancer cells including anchorage-independent growth, invasion, and chemoresistance, and positively correlates with CD133 stem cell marker expression; Wnt canonical signaling and Twist/Akt/Erk axis are regulated by NRSN2. Loss- and gain-of-function assays, colony formation, subcutaneous tumor formation, invasion assays, western blot for Wnt/Akt/Erk pathway components Biomedicine & pharmacotherapy Medium 27908706
2017 NRSN2 promotes osteosarcoma cell proliferation and growth through dysregulation of both PI3K/AKT/mTOR and Wnt/β-catenin signaling pathways, demonstrated by loss- and gain-of-function assays in vitro and in vivo. Loss- and gain-of-function assays in osteosarcoma cell lines, in vivo tumor growth assays, western blot for PI3K/AKT/mTOR and Wnt/β-catenin pathway components American journal of cancer research Medium 28401012
2019 NRSN2 promotes breast cancer cell proliferation, migration, and invasion by activating PI3K/AKT/mTOR and NF-κB signaling pathways, as shown by KD/OE experiments in vitro and in vivo. MTT assay, western blot for PI3K/AKT/mTOR and NF-κB pathway components, KD/OE in breast cancer cells, in vivo xenograft Oncology letters Medium 31885716
2021 miR-143 directly targets NRSN2 (binding relationship verified by dual luciferase assay); BMSC-derived extracellular vesicles deliver lncRNA MALAT1 into osteosarcoma cells where MALAT1 sponges miR-143, thereby de-repressing NRSN2 expression and activating Wnt/β-catenin signaling to promote osteosarcoma proliferation, invasion, and migration. Dual luciferase reporter assay, EV isolation and characterization, transfection of si-MALAT1 and miR-143 mimic, western blot for Wnt/β-catenin pathway proteins, in vivo xenograft OncoTargets and therapy Medium 33564242
2021 miR-1913 directly targets NRSN2 (validated by dual luciferase reporter assay); hBMSC-derived exosomes deliver miR-1913 into osteosarcoma cells, suppressing NRSN2 expression and thereby inhibiting osteosarcoma cell viability, proliferation, migration, and invasion. Dual luciferase reporter assay, CCK8, colony formation, wound healing, transwell assays, RT-qPCR and western blot for NRSN2 and EMT markers, TEM and NTA for exosome characterization American journal of translational research Medium 34650689
2022 NRSN2 activates the ERK1/2-Bcl-xL signaling pathway; miR-206 (delivered via BMSC-derived extracellular vesicles) directly targets NRSN2 (validated by dual luciferase assay), suppressing NRSN2-mediated ERK1/2-Bcl-xL activation and inhibiting osteosarcoma progression. Dual luciferase reporter assay, western blot for p-ERK1/2, ERK1/2, Bcl-xL, EdU and colony formation assays, flow cytometry for apoptosis, immunofluorescence, in vivo xenograft European journal of histochemistry Medium 35730574
2022 E2F1 directly transcribes NRSN2 (confirmed by luciferase reporter and chromatin immunoprecipitation assays); the E2F1/NRSN2 axis promotes ESCC cell proliferation, migration, and invasion by activating the AKT/mTOR pathway. Luciferase reporter assay, chromatin immunoprecipitation (ChIP), loss- and gain-of-function assays, western blot for AKT/mTOR pathway, in vivo xenograft Pathology, research and practice Medium 35662041
2024 NRSN2 promotes malignant behavior of HPV-transfected laryngeal carcinoma cells through activation of the AMPK/ULK1 pathway and consequent autophagy induction; NRSN2 knockdown suppresses AMPK/ULK1-mediated autophagy and restrains malignant behavior. RT-qPCR, immunoblotting, immunofluorescence, CCK-8, EdU staining, transwell, wound healing, flow cytometry, TEM for autophagosomes, AMPK/ULK1 pathway inhibition experiments Cancer biology & therapy Medium 38569536
2024 NRSN2 knockout mice show significant alterations in functional brain network connectivity—particularly in sensory-related (gustatory and auditory) and default mode network regions—without marked changes in brain microstructure or regional activity, linking NRSN2 to sensory processing and stress resilience circuitry. 11.7 T multimodal MRI (structural and functional) in Nrsn2 homozygous knockout mice compared with wild-type at juvenile and adult stages Phenomics Medium 39723223
2024 lncRNA LUESCC functions as a ceRNA by sponging miR-6785-5p to enhance NRSN2 expression, which is critical for ESCC proliferation, migration, and invasion; this axis was mechanistically established by luciferase reporter assays and rescue experiments. Luciferase reporter assay (LUESCC/miR-6785-5p and miR-6785-5p/NRSN2 interactions), KD of LUESCC, rescue by NRSN2 modulation, in vitro and in vivo functional assays Cellular and molecular life sciences Medium 38457049

Source papers

Stage 0 corpus · 16 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2017 NRSN2 promotes osteosarcoma cell proliferation and growth through PI3K/Akt/MTOR and Wnt/β-catenin signaling. American journal of cancer research 38 28401012
2021 Bone Marrow Mesenchymal Stem Cells-Derived Extracellular Vesicles Promote Proliferation, Invasion and Migration of Osteosarcoma Cells via the lncRNA MALAT1/miR-143/NRSN2/Wnt/β-Catenin Axis. OncoTargets and therapy 30 33564242
2015 Down-Regulated NRSN2 Promotes Cell Proliferation and Survival Through PI3K/Akt/mTOR Pathway in Hepatocellular Carcinoma. Digestive diseases and sciences 19 26055238
2015 NRSN2 promotes non-small cell lung cancer cell growth through PI3K/Akt/mTOR pathway. International journal of clinical and experimental pathology 18 26045763
2019 NRSN2 promotes breast cancer metastasis by activating PI3K/AKT/mTOR and NF-κB signaling pathways. Oncology letters 17 31885716
2023 Long non-coding RNA NRSN2-AS1 promotes ovarian cancer progression through targeting PTK2/β-catenin pathway. Cell death & disease 14 37875515
2021 The exosomal transfer of human bone marrow mesenchymal stem cell-derived miR-1913 inhibits osteosarcoma progression by targeting NRSN2. American journal of translational research 14 34650689
2024 LncRNA LUESCC promotes esophageal squamous cell carcinoma by targeting the miR-6785-5p/NRSN2 axis. Cellular and molecular life sciences : CMLS 13 38457049
2022 Long non-coding RNA NRSN2-AS1 facilitates tumorigenesis and progression of ovarian cancer via miR-744-5p/PRKX axis. Biology of reproduction 13 34791059
2022 Extracellular vesicles from bone mesenchymal stem cells transport microRNA-206 into osteosarcoma cells and target NRSN2 to block the ERK1/2-Bcl-xL signaling pathway. European journal of histochemistry : EJH 13 35730574
2022 Long non-coding RNA NRSN2-AS1, transcribed by SOX2, promotes progression of esophageal squamous cell carcinoma by regulating the ubiquitin-degradation of PGK1. Clinical & experimental metastasis 12 35715622
2016 Highly expressed NRSN2 is related to malignant phenotype in ovarian cancer. Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie 10 27908706
2022 E2F1-activated NRSN2 promotes esophageal squamous cell carcinoma progression through AKT/mTOR pathway. Pathology, research and practice 5 35662041
2024 NRSN2 promotes the malignant behavior of HPV-transfected laryngeal carcinoma cells through AMPK/ULK1 pathway mediated autophagy activation. Cancer biology & therapy 3 38569536
2024 Alterations of Sensory-related Functional Brain Network Connectivity in Nrsn2 Homozygous Knockout Mice. Phenomics (Cham, Switzerland) 3 39723223
2024 Recombinant human protein TCFL5-activated NRSN2-AS1 promotes esophageal cancer progression via the microRNA-874-5p/RELT regulatory axis. International journal of biological macromolecules 1 38996888

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