| 1991 |
VGF gene transcription is rapidly and selectively induced by NGF (and basic FGF) in PC12 cells via a cAMP response element (CRE) in the promoter; induction also occurs with depolarization and PMA. The promoter contains TATAA, CCAAT elements, GC boxes, and a consensus CRE-binding protein site. |
Northern/RNase protection analysis, promoter cloning and sequencing, transcription reporter assays in PC12 cells |
Molecular and cellular biology |
High |
2017159
|
| 1992 |
NGF induces VGF gene expression at the transcriptional level through a consensus CRE embedded in a 14-bp palindrome immediately upstream of the transcription start site; mutation of this CRE eliminates induction by both NGF and cAMP. This element selectively responds to NGF/cAMP but not EGF, FGF, or PMA. The inducible transcription factor CREB binds this CRE. |
Promoter mutagenesis, transient transfection reporter assays, EMSA (CREB binding), pharmacological treatments in PC12 cells |
The Journal of neuroscience |
High |
1377233
|
| 1992 |
VGF gene induction by NGF requires ongoing protein synthesis (transcription-dependent), is partly repressed in non-neuronal cells by a nuclear repressor, and a 110-bp promoter region contains both positive and negative regulatory elements. A 47-bp oligonucleotide within this region specifically binds nuclear proteins that differ between VGF-expressing and non-expressing cells. |
Transcriptional run-on, promoter-reporter transfection, EMSA with cell-type-specific nuclear extracts, protein synthesis inhibition |
Proceedings of the National Academy of Sciences |
High |
1570299
|
| 1995 |
VGF precursor undergoes tissue-specific proteolytic processing in a post-ER compartment to produce low-molecular-weight species (~20, 18, 10 kDa). These processed forms are enriched in secretory vesicles and preferentially secreted upon membrane depolarization, indicating regulated release from dense core vesicles. |
Immunoblotting with N- and C-terminal antisera, subcellular fractionation, depolarization-induced secretion assays in cerebellar granule cells and PC12 cells |
Journal of neurochemistry |
High |
7595538
|
| 1996 |
VGF transcriptional induction by NGF is mediated through a Ras-dependent signaling pathway. Three promoter elements are required: a CRE (binding ATF-1, ATF-2, CREB), a novel CCAAT element, and a G(S)G element between the TATA box and transcription start site that binds the NGF/Ras-induced transcription factor NGFI-A. All three are necessary but no single element is sufficient. |
Chimeric vgf/beta-globin reporter gene transfection, dominant-interfering and activated Ras mutants, TrkA mutants, promoter deletional/mutational analysis, EMSA |
Molecular and cellular biology |
High |
8756618
|
| 1997 |
VGF promoter regulation involves cooperative binding of an E-box (binding HTF4/HEB E-protein as part of a multiprotein complex) and a CRE; the E-box acts as a repressor in non-neuronal (NIH 3T3) cells but as a stimulator in NGF-responsive PC12 cells. A neuro-specific bHLH transcription factor (MASH1) participates in neurotrophin-dependent transcription via the CCAAT motif. |
EMSA, expression cDNA cloning, reporter gene transfection, mutational analysis of E-box and CRE |
Molecular and cellular biology |
High |
9032251
|
| 1999 |
VGF knockout mice are lean, hypermetabolic, hyperactive, and infertile with markedly reduced leptin levels, fat stores, and altered hypothalamic POMC, NPY, and AGRP expression, establishing a non-redundant role for VGF in energy homeostasis. VGF mRNA is induced in hypothalamic arcuate nuclei upon fasting. |
Targeted gene deletion (knockout mice), metabolic phenotyping, in situ hybridization |
Neuron |
High |
10433265
|
| 1999 |
VGF is expressed in insulin-secreting INS-1 beta cells, where it is processed in a post-ER compartment and its peptides are released via a regulated secretory pathway upon stimulation with glucose, cAMP, or PMA. VGF mRNA in INS-1 cells is transcriptionally upregulated by increased intracellular cAMP but not by glucose or NGF. |
RT-PCR, metabolic labeling, immunoprecipitation, secretion assays in INS-1 cells |
Endocrinology |
High |
10433233
|
| 2002 |
PC1/3 and PC2 prohormone convertases process the VGF precursor: both generate VGF20 (a ~20 kDa C-terminal fragment), while VGF10 is preferentially produced by PC1/3. The KRKRKK(488) motif is the target cleavage site generating VGF20 (identified by site-directed mutagenesis); VGF10 results from cleavage at RPR(555). Two additional novel VGF peptides were identified in rat brain by MALDI-ToF MS and Edman degradation. |
Ectopic expression of PC1/3 or PC2 in GH3 cells, site-directed mutagenesis of VGF cleavage sites, MALDI-ToF MS, Edman degradation |
Journal of neurochemistry |
High |
12065665
|
| 2002 |
VGF and POMC are co-expressed in lateral arcuate neurons in fed state; VGF expression is induced in medial arcuate NPY neurons after fasting. VGF mRNA induction in fasted mice is inhibited by exogenous leptin, and is elevated in leptin-deficient ob/ob and db/db mice. VGF deficiency completely blocks obesity in agouti (Ay/a) mice but only attenuates weight gain in ob/ob mice, placing VGF downstream of melanocortin 4 receptors in autonomic outflow pathways. |
Double-label in situ hybridization, genetic epistasis (VGF KO × Ay/a, ob/ob, db/db crosses), leptin injection, gold thioglucose and diet-induced obesity models |
The Journal of neuroscience |
High |
12177191
|
| 2002 |
NGF-dependent and tissue-specific transcription of vgf is regulated by a CREB-p300 complex and a bHLH factor interaction. In non-neuronal cells, HEB (ubiquitous bHLH) and p300 form a repressor complex at the promoter. In neuronal cells, neurotrophin-dependent transcription is mediated by a distinct complex containing CREB, MASH1 (neuro-specific bHLH), and p300 bound to the CCAAT motif. |
Co-immunoprecipitation, EMSA, chromatin immunoprecipitation, reporter gene transfection, dominant-negative approaches |
FEBS letters |
High |
11755530
|
| 2005 |
VGF sorting into the regulated secretory pathway (large dense core vesicles, LDCVs) requires a compact C-terminal alpha-helix and an embedded 564RRR566 prohormone convertase cleavage site. Mutation of 564RRR566 blocks regulated secretion; mutation of adjacent 567HFHH570 also blocks regulated release. Inhibition of PC cleavage by membrane-permeable chloromethyl ketone (decanoyl-RVKR-CMK) blocks regulated VGF secretion. |
Deletional and site-directed mutagenesis of VGF, confocal microscopy, subcellular fractionation, pharmacological PC inhibition in PC12 and INS-1 cells |
The Journal of biological chemistry |
High |
16221685
|
| 2006 |
The VGF-derived peptide TLQP-21 (identified in rat brain by immunoprecipitation/LC-MS/MS) increases resting energy expenditure and rectal temperature upon chronic ICV injection in mice, preventing diet-induced obesity. TLQP-21 acts by stimulating autonomic activation of the adrenal medulla, upregulating brown adipose tissue beta2-AR and white adipose tissue PPAR-delta, beta3-AR, and UCP1 mRNAs, independently of thyroid hormones or locomotor activity. |
LC-MS/MS peptide identification, chronic ICV injection, indirect calorimetry, gene expression (RT-PCR), hormonal measurements |
Proceedings of the National Academy of Sciences |
High |
16983076
|
| 2008 |
The VGF C-terminal peptide TLQP-62 induces transient potentiation in rat hippocampal slices through a mechanism blocked by the BDNF scavenger TrkB-Fc, Trk kinase inhibitor K252a, and tPA inhibitor tPASTOP, but not by NMDA receptor antagonist APV or anti-p75NTR. VGF knockout mice cannot undergo hippocampal LTD and show impaired spatial learning and contextual fear conditioning. |
Electrophysiology in hippocampal slices (LTP/LTD), pharmacological blockade with specific inhibitors, VGF KO behavioral testing (Morris water maze, fear conditioning) |
The Journal of neuroscience |
High |
18815270
|
| 2009 |
VGF-derived peptides AQEE-30 and LQEQ-19 evoke dose-dependent thermal hyperalgesia upon intrathecal injection via activation of p38 MAP kinase. LQEQ-19 induces p38 phosphorylation in spinal microglia in vivo and in BV-2 microglial cells in vitro. VGF protein levels are rapidly upregulated in dorsal root ganglion neurons after nerve injury and hindpaw inflammation. |
Intrathecal peptide injection, thermal hyperalgesia assays, p38 immunostaining/phospho-western, proteomics of DRG neurons |
The Journal of neuroscience |
High |
19846725
|
| 2009 |
NERP-1 and NERP-2, novel bioactive peptides derived from VGF, co-localize with vasopressin in storage granules of paraventricular and supraoptic hypothalamic nuclei. Administration of NERPs suppresses vasopressin release from hypothalamus and pituitary induced by hypertonic saline or angiotensin II. |
Immunohistochemistry/co-localization, in vivo and ex vivo vasopressin secretion assays |
Cellular and molecular life sciences |
Medium |
19194657
|
| 2012 |
TLQP-21 promotes lipolysis in murine white adipose tissue (WAT) via a saturable receptor-binding mechanism that requires activation of noradrenaline/beta-adrenergic receptor pathways. VGF immunoreactivity is present in sympathetic nerve fibers innervating WAT but not in adipocytes. TLQP-21 binding capacity is higher in WAT than other tissues and is upregulated in obese mice. |
Receptor binding assays (saturation binding), lipolysis assays in primary adipocytes, immunohistochemistry, in vivo injection in obesity models |
The Biochemical journal |
High |
21880012
|
| 2012 |
Nkx6.1 strongly upregulates VGF in rat islets, and VGF is necessary and sufficient for Nkx6.1-mediated enhancement of glucose-stimulated insulin secretion (GSIS). The VGF-derived peptide TLQP-21 potentiates GSIS in rat and human islets and improves glucose tolerance in vivo. Chronic TLQP-21 injection in prediabetic ZDF rats preserves islet mass. TLQP-21 prevents islet apoptosis by a GLP-1/GIP/VIP receptor-independent pathway similar to that of GLP-1. |
Overexpression/knockdown of VGF in rat islets, GSIS assays, receptor antagonist studies, in vivo ZDF rat treatment, apoptosis assays |
Cell metabolism |
High |
22768837
|
| 2013 |
C3a receptor-1 (C3AR1) is a G protein-coupled receptor target for the VGF-derived peptide TLQP-21 in rodent cells. Identified by unbiased genome-wide transcriptome sequencing of responsive CHO-K1 cells, confirmed by siRNA knockdown and receptor antagonists. TLQP-21 signaling through C3AR1 is pertussis toxin-sensitive (consistent with Gi/o coupling) and directs migration of mouse RAW264.7 macrophages. |
Unbiased RNA-seq-based receptor deorphanization, siRNA knockdown, receptor antagonists, pertussis toxin, cell migration assays |
The Journal of biological chemistry |
High |
23940034
|
| 2013 |
gC1qR (globular heads of the C1q receptor) is a receptor for the VGF-derived peptide TLQP-21, identified by chemical cross-linking combined with mass spectrometry. TLQP-21 causes increased intracellular Ca2+ in rat macrophages and microglia via gC1qR. TLQP-21-stimulated macrophages cause mechanical hypersensitivity when inoculated into rat hind paw; gC1qR-neutralizing antibody attenuates neuropathic pain in partial sciatic nerve ligation. |
Chemical cross-linking/mass spectrometry, siRNA knockdown, neutralizing antibodies, intracellular Ca2+ imaging, in vivo pain model |
The Journal of biological chemistry |
High |
24106277
|
| 2014 |
TLQP-21 induces thermal hyperalgesia via p38 MAP kinase and is inhibited by cyclooxygenase and lipoxygenase inhibitors. Immunoneutralization of endogenous TLQP-21 by intrathecal anti-TLQP-21 antibody inhibits tactile hypersensitivity and thermal hyperalgesia in CFA-induced inflammation and spared nerve injury neuropathic pain models, demonstrating that endogenous TLQP-21 contributes to spinal pain sensitization. |
Intrathecal peptide/antibody administration, von Frey and thermal withdrawal assays, pharmacological inhibitors (p38, COX, LOX) in CFA and SNI mouse models |
Pain |
High |
24657450
|
| 2014 |
The granin VGF promotes biogenesis of large dense core vesicles (LDCVs) in the adrenal medulla. VGF knockout mice have decreased LDCV size in noradrenergic chromaffin cells, increased adrenal norepinephrine and epinephrine content, elevated plasma epinephrine, decreased adrenal chromogranin B, and hypertension. Expression of exogenous VGF in NIH 3T3 fibroblasts generates LDCV-like structures with depolarization-induced secretion. Knock-in of human VGF1-615 rescues the hypertensive phenotype; knock-in of truncated VGF1-524 (lacking TLQP-21) only partially rescues it. Acute and chronic TLQP-21 administration decreases blood pressure. |
Germline VGF KO and humanized knock-in mice, electron microscopy of adrenal chromaffin cells, catecholamine measurements, blood pressure telemetry, VGF overexpression in NIH 3T3 fibroblasts, peptide administration |
FASEB journal |
High |
24497580
|
| 2015 |
VGF expression and secretion of C-terminal peptide TLQP-62 in hippocampus are transiently induced after fear memory training. Sequestering TLQP-62 after training impairs memory formation. TLQP-62 induces acute TrkB receptor phosphorylation and subsequent CREB phosphorylation in hippocampal slices. TLQP-62's memory-enhancing effect is rescued by BDNF-TrkB signaling activation and is VGF-dependent (germline or antibody-sequestration experiments). VGF-deficient mice show impaired Rac1 induction and reduced cofilin/synapsin phosphorylation after learning. |
In vivo fear conditioning, intra-hippocampal antibody infusion, hippocampal slice TrkB phosphorylation assays, VGF KO mice, BDNF rescue experiments, signaling pathway analysis (Rac1, cofilin, synapsin) |
The Journal of neuroscience |
High |
26180209
|
| 2017 |
VGF regulates insulin secretory granule biogenesis in pancreatic beta cells. Conditional VGF knockout in islets and beta-cell-specific knockout mice show profound decreases in stimulus-coupled insulin secretion. VGF is required for efficient exit of granule cargo from the trans-Golgi network, for proinsulin processing, and for replenishment of insulin granule stores after nutrient stimulation. |
Conditional KO (floxed VGF mice + Cre), islet secretion assays, electron microscopy of secretory granules, proinsulin processing analysis, trans-Golgi network trafficking assays |
Cell reports |
High |
28877479
|
| 2017 |
VGF regulates depression-like behavior in dorsal hippocampus (dHc) and nucleus accumbens (NAc) in opposite directions: dHc VGF ablation produces pro-depressant behavior and dHc VGF overexpression produces antidepressant behavior; NAc VGF ablation is antidepressant and overexpression is pro-depressant. The antidepressant efficacy of ketamine requires VGF expression and is associated with rapid VGF translation. TLQP-62 antidepressant effects in dHc require AMPA receptor and mTOR signaling (blocked by NBQX and rapamycin). Conditional pan-neuronal (but not forebrain) VGF ablation increases stress susceptibility, indicating neuronal (partially inhibitory interneuron) VGF regulates depression. |
AAV-Cre conditional KO and overexpression in floxed VGF mice (region-specific), germline VGF heterozygous mice, social defeat stress, forced swim test, AMPA/mTOR pharmacological inhibitors, Synapsin-Cre and αCaMKII-Cre crosses |
Molecular psychiatry |
High |
29158577
|
| 2020 |
TLQP-21 increases motility and phagocytic capacity in murine microglia via C3aR1 signaling. C3aR1-null primary microglia have impaired basal phagocytic function; TLQP-21 and C3a super agonist induce overlapping transcriptomic changes (migration/proliferation genes) in wild-type but not C3aR1-null microglia. ICV TLQP-21 in 5xFAD mice reduces amyloid plaques, associated dystrophic neurites, and restores Alzheimer-associated microglial gene expression. Human TLQP-21 activates human microglia similarly to mouse TLQP-21. |
Phagocytosis/migration assays, RNA-seq of primary microglia (WT vs. C3aR1-null), osmotic pump ICV delivery in 5xFAD mice, immunohistochemistry for amyloid plaques, human HMC3 microglial cell line assays |
Molecular neurodegeneration |
High |
31924226
|
| 2020 |
TLQP-21 impairs metabotropic purinergic (P2Y) signaling in microglia in acute brain slices, attenuating ATP-induced K+ conductance, UDP-stimulated phagocytosis, and ATP-dependent process outgrowth toward injury. These impairments are reversed by blocking C1qBP but not C3aR1. In cultured microglia (which express both receptors), TLQP-21 additionally evokes Ca2+ transients, membrane currents, and chemotaxis via C3aR1, demonstrating dual receptor-dependent effects. |
Whole-cell patch clamp in brain slices, phagocytosis assays, laser lesion-induced process outgrowth imaging, Ca2+ imaging, C1qBP and C3aR1 antagonists, primary microglia from C3aR1-null mice |
The Journal of neuroscience |
High |
32060170
|
| 2020 |
SOX9 drives injury-induced transcriptional upregulation of VGF in renal tubular epithelial cells (RTECs). RTEC-specific Vgf gene ablation exacerbates ischemia-, cisplatin-, and rhabdomyolysis-induced acute kidney injury in vivo and cisplatin-induced RTEC death in vitro. Aggravation of cisplatin injury by Vgf ablation is partly reversed by exogenous TLQP-21 peptide. |
Renal transcriptome profiling in three AKI mouse models, RTEC-specific conditional KO, in vitro cell death assays, SOX9 ChIP/reporter assays, TLQP-21 rescue experiments |
The Journal of biological chemistry |
High |
32887795
|
| 2021 |
TLQP-62 or contextual fear memory training acutely increases translation of VGF and other granin proteins (CgB, Scg2) via mTOR-dependent signaling without measurable increases in mRNA, constituting a transcription-independent autofeedback mechanism. The 3'UTR of Vgf mRNA represses VGF translation (validated by luciferase reporter). Mice with truncated endogenous Vgf 3'UTR show substantially increased VGF protein, enhanced memory performance, and reduced anxiety/depression-like behaviors. |
Polysome/translation assays, luciferase 3'UTR reporter assays, Vgf 3'UTR-truncation knock-in mice, mTOR inhibition (rapamycin), fear conditioning behavioral assays |
Translational psychiatry |
High |
34238925
|
| 2008 |
The VGF-derived peptide TLQP-21 promotes survival of rat cerebellar granule cells (CGCs) against serum/potassium deprivation-induced apoptosis in a dose- and time-dependent manner. Neuroprotection is associated with activation of ERK1/2, Akt (serine/threonine kinase), and JNK phosphorylation, decreased PKC phosphorylation, and increased intracellular Ca2+ in ~60% of neurons. |
Cell viability assays, DNA fragmentation (apoptosis), western blot for kinase phosphorylation, fura-2AM Ca2+ imaging in primary CGC cultures |
Journal of neurochemistry |
Medium |
18173805
|
| 2014 |
TLQP-62 induces proliferation of early-phase (Type 2a nestin+) neural progenitor cells in the adult hippocampus via NMDA receptor- and mGluR5-dependent glutamate signaling, activating CaMKII and PKD, respectively. TLQP-62 also gradually activates TrkB (BDNF receptor), and TrkB signaling is required for TLQP-62-induced NPC proliferation. |
Nestin-GFP reporter mice, BrdU/thymidine incorporation, NPC proliferation assays in vitro (cell line and primary progenitors), pharmacological NMDA/mGluR5/CaMKII/PKD inhibitors, Cyclin D qPCR, TrkB inhibitors |
Stem cell research |
High |
24747217
|
| 2016 |
Voluntary running induces VGF expression in the brain, which promotes oligodendrogenesis in the cerebellum of Snf2h conditional knockout ataxic mice, prolonging survival. VGF neuropeptides promote oligodendrogenesis in vitro, and adenoviral VGF overexpression in vivo rescues survival without requiring exercise. |
Conditional Snf2h KO mice, voluntary wheel running, VGF adenoviral overexpression, oligodendrocyte lineage cell counts, in vitro oligodendrogenesis assays |
Cell reports |
High |
27732860
|
| 2009 |
TLQP-21 induces contraction of rat forestomach smooth muscle by releasing prostaglandins PGE2 and PGF2a from the mucosal layer, blocked by indomethacin and selective COX-1/COX-2 inhibitors. ICV TLQP-21 decreases gastric emptying by ~40% via central PG release. VGF immunoreactivity is present in gastric neuronal cells. |
Isolated smooth muscle preparation, in vitro contraction assays, pharmacological inhibitors (indomethacin, COX-1/2), in vivo ICV injection, gastric emptying measurement, immunostaining |
British journal of pharmacology |
Medium |
19466987
|
| 2018 |
VGF and TLQP-62 in ventromedial prefrontal cortex (vmPFC) regulate stress susceptibility and antidepressant response to ketamine. TLQP-62 antidepressant-like effects in vmPFC require BDNF expression and calcium mobilization (blocked by xestospongin C, an IP3 receptor inhibitor, and SKF96365, a TRPC/store-operated channel inhibitor), revealing a calcium-dependent signaling mechanism downstream of TLQP-62/BDNF. |
AAV-Cre conditional VGF KO and overexpression in floxed VGF mice (vmPFC), intra-vmPFC TLQP-62 infusion, Bdnf conditional KO, pharmacological Ca2+ pathway inhibitors, chronic restraint stress, subchronic variable stress |
Neuropsychopharmacology |
High |
30504797
|
| 2019 |
lncRNA H19 binds VGF protein (demonstrated by RNA pulldown and mass spectrometry) and promotes pancreatic neuroendocrine neoplasm (pNEN) cell proliferation, migration and invasion. VGF activated PI3K/AKT/CREB signaling; H19 activates this signaling pathway via VGF, and VGF knockdown reduces these oncogenic phenotypes. |
RNA pulldown/mass spectrometry, RIP, siRNA knockdown, in vitro proliferation/migration/invasion assays, RNA-seq, in vivo xenograft |
Endocrine-related cancer |
Medium |
31117050
|
| 1989 |
VGF immunoreactivity in the hypothalamus co-localizes with vasopressin or vasoactive intestinal polypeptide in SCN neurons, and with oxytocin or vasopressin in paraventricular and supraoptic nuclei. Ultrastructural studies show VGF immunoreactivity in presynaptic boutons in SCN and in axons of the neurohypophysis, consistent with a secretory neuropeptide role. |
Immunocytochemistry with two non-overlapping antisera, colchicine axonal transport blockade, co-localization by immunofluorescence, electron microscopy |
The Journal of neuroscience |
High |
2556505
|
| 1996 |
VGF is localized to a subpopulation of large dense core vesicles in PC12 cells (by electron microscopy). In developing hippocampal neurons, VGF-containing vesicles are present from earliest developmental stages and are particularly abundant in GABAergic neurons; VGF becomes restricted to axons after dendrites mature (associated with synaptogenesis, not axonal polarization). VGF-containing and synaptophysin-containing vesicles are distinct and differentially distributed. |
Electron microscopy immunolabeling in PC12 cells, immunofluorescence co-localization in hippocampal neurons, developmental staging |
Brain research. Developmental brain research |
Medium |
8922684
|