Pan B

References (8)

Title : Sweet potato extract alleviates high-fat-diet-induced obesity in C57BL\/6J mice, but not by inhibiting pancreatic lipases - Liu_2022_Front.Nutr_9_1016020
Author(s) : Liu T , Wu F , Chen K , Pan B , Yin X , You Y , Song Z , Li D , Huang D
Ref : Front Nutr , 9 :1016020 , 2022
Abstract : SCOPE AND AIM: Sweet potato is widely consumed as a healthy and nutritive vegetable containing bioactive constituents for health promotion. This study investigated the beneficial impact of white-fleshed sweet potato extract (SPE) on high fat diet (HFD)-induced obese mice. METHODS AND RESULTS: First, SPE, in which resin glycoside was found as the dominant constituent, was suggested as a potential anti-obesity agent, because 20-70% pancreatic lipase (PL) inhibition was measured with SPE by in vitro turbidity assay and pNPP assay. Hence, next, the effect of SPE on obese mice was detected by oral administration of HFD supplemented with 6% SPE on C57BL/6J mice for 9 weeks. Surprisingly, being the opposite of what was typically observed from a lipase inhibitor such as orlistat, the fecal fat content in SPE-fed obese mice was decreased (p < 0.01). Meanwhile, 6% SPE supplement indeed significantly ameliorated HFD-induced obesity in mice, including body weight gain, fat accumulation, adipocyte enlargement, insulin resistance, and hepatic steatosis (p < 0.05). The improved liver steatosis was found associated with a down-regulating action of SPE on nuclear factor kappa B activation in HFD-fed mice. The anti-obesity influence of SPE was also confirmed on the HepG2 cell model for non-alcoholic fatty liver disease (NAFLD). CONCLUSION: These results indicate that SPE, as a dietary supplement, has the great potential for weight control and treating hepatic steatosis, possibly through a different action mechanism from that of orlistat.
ESTHER : Liu_2022_Front.Nutr_9_1016020
PubMedSearch : Liu_2022_Front.Nutr_9_1016020
PubMedID: 36505243

Title : What is the impact of PCSK9 rs505151 and rs11591147 polymorphisms on serum lipids level and cardiovascular risk: a meta-analysis - Qiu_2017_Lipids.Health.Dis_16_111
Author(s) : Qiu C , Zeng P , Li X , Zhang Z , Pan B , Peng ZYF , Li Y , Ma Y , Leng Y , Chen R
Ref : Lipids Health Dis , 16 :111 , 2017
Abstract : BACKGROUND: PCSK9 rs505151 and rs11591147 polymorphisms are identified as gain- and loss-of-function mutations, respectively. The effects of these polymorphisms on serum lipid levels and cardiovascular risk remain to be elucidated.
METHODS: In this meta-analysis, we explored the association of PCSK9 rs505151 and rs11591147 polymorphisms with serum lipid levels and cardiovascular risk by calculating the standardized mean difference (SMD) and odds ratios (OR) with 95% confidence intervals (CI).
RESULTS: Pooled results analyzed under a dominant genetic model indicated that the PCSK9 rs505151 G allele was related to higher levels of triglycerides (SMD: 0.14, 95% CI: 0.02 to 0.26, P = 0.021, I2 = 0) and low-density lipoproteins cholesterol (LDL-C) (SMD: 0.17, 95% CI: 0.00 to 0.35, P = 0.046, I2 = 75.9%) and increased cardiovascular risk (OR: 1.50, 95% CI: 1.19 to 1.89, P = 0.0006, I2 = 48%). The rs11591147 T allele was significantly associated with lower levels of total cholesterol (TC) and LDL-C (TC, SMD: -0.45, 95% CI: -0.57 to -0.32, P = 0.000, I2 = 0; LDL-C, SMD: -0.44, 95% CI: -0.55 to -0.33, P = 0.000, I2 = 0) and decreased cardiovascular risk (OR: 0.77, 95% CI: 0.60 to 0.98, P = 0.031, I2 = 59.9) in Caucasians.
CONCLUSIONS: This study indicates that the variant G allele of PCSK9 rs505151 confers increased triglyceride (TG) and LDL-C levels, as well as increased cardiovascular risk. Conversely, the variant T allele of rs11591147 protects carriers from cardiovascular disease susceptibility and lower TC and LDL-C levels in Caucasians. These findings provide useful information for researchers interested in the fields of PCSK9 genetics and cardiovascular risk prediction not only for designing future studies, but also for clinical and public health applications.
ESTHER : Qiu_2017_Lipids.Health.Dis_16_111
PubMedSearch : Qiu_2017_Lipids.Health.Dis_16_111
PubMedID: 28606094

Title : Monoacylglycerol lipase inhibition blocks chronic stress-induced depressive-like behaviors via activation of mTOR signaling - Zhong_2014_Neuropsychopharmacology_39_1763
Author(s) : Zhong P , Wang W , Pan B , Liu X , Zhang Z , Long JZ , Zhang HT , Cravatt BF , Liu QS
Ref : Neuropsychopharmacology , 39 :1763 , 2014
Abstract : The endocannabinoid (eCB) system regulates mood, emotion, and stress coping, and dysregulation of the eCB system is critically involved in pathophysiology of depression. The eCB ligand 2-arachidonoylglycerol (2-AG) is inactivated by monoacylglycerol lipase (MAGL). Using chronic unpredictable mild stress (CUS) as a mouse model of depression, we examined how 2-AG signaling in the hippocampus was altered in depressive-like states and how this alteration contributed to depressive-like behavior. We report that CUS led to impairment of depolarization-induced suppression of inhibition (DSI) in mouse hippocampal CA1 pyramidal neurons, and this deficiency in 2-AG-mediated retrograde synaptic depression was rescued by MAGL inhibitor JZL184. CUS induced depressive-like behaviors and decreased mammalian target of rapamycin (mTOR) activation in the hippocampus, and these biochemical and behavioral abnormalities were ameliorated by chronic JZL184 treatments. The effects of JZL184 were mediated by cannabinoid CB1 receptors. Genetic deletion of mTOR with adeno-associated viral (AAV) vector carrying the Cre recombinase in the hippocampus of mTORf/f mice recapitulated depressive-like behaviors induced by CUS and abrogated the antidepressant-like effects of chronic JZL184 treatments. Our results suggest that CUS decreases eCB-mTOR signaling in the hippocampus, leading to depressive-like behaviors, whereas MAGL inhibitor JZL184 produces antidepressant-like effects through enhancement of eCB-mTOR signaling.
ESTHER : Zhong_2014_Neuropsychopharmacology_39_1763
PubMedSearch : Zhong_2014_Neuropsychopharmacology_39_1763
PubMedID: 24476943

Title : Alterations of endocannabinoid signaling, synaptic plasticity, learning, and memory in monoacylglycerol lipase knock-out mice - Pan_2011_J.Neurosci_31_13420
Author(s) : Pan B , Wang W , Zhong P , Blankman JL , Cravatt BF , Liu QS
Ref : Journal of Neuroscience , 31 :13420 , 2011
Abstract : Endocannabinoid (eCB) signaling is tightly regulated by eCB biosynthetic and degradative enzymes. The eCB 2-arachidonoylglycerol (2-AG) is hydrolyzed primarily by monoacylglycerol lipase (MAGL). Here, we investigated whether eCB signaling, synaptic function, and learning behavior were altered in MAGL knock-out mice. We report that MAGL(-)/(-) mice exhibited prolonged depolarization-induced suppression of inhibition (DSI) in hippocampal CA1 pyramidal neurons, providing genetic evidence that the inactivation of 2-AG by MAGL determines the time course of the eCB-mediated retrograde synaptic depression. CB(1) receptor antagonists enhanced basal IPSCs in CA1 pyramidal neurons in MAGL(-)/(-) mice, while the magnitude of DSI or CB(1) receptor agonist-induced depression of IPSCs was decreased in MAGL(-)/(-) mice. These results suggest that 2-AG elevations in MAGL(-)/(-) mice cause tonic activation and partial desensitization of CB(1) receptors. Genetic deletion of MAGL selectively enhanced theta burst stimulation (TBS)-induced long-term potentiation (LTP) in the CA1 region of hippocampal slices but had no significant effect on LTP induced by high-frequency stimulation or long-term depression induced by low-frequency stimulation. The enhancement of TBS-LTP in MAGL(-)/(-) mice appears to be mediated by 2-AG-induced suppression of GABA(A) receptor-mediated inhibition. MAGL(-)/(-) mice exhibited enhanced learning as shown by improved performance in novel object recognition and Morris water maze. These results indicate that genetic deletion of MAGL causes profound changes in eCB signaling, long-term synaptic plasticity, and learning behavior.
ESTHER : Pan_2011_J.Neurosci_31_13420
PubMedSearch : Pan_2011_J.Neurosci_31_13420
PubMedID: 21940435
Gene_locus related to this paper: human-MGLL , mouse-MGLL

Title : Genetic deletion of monoacylglycerol lipase alters endocannabinoid-mediated retrograde synaptic depression in the cerebellum - Zhong_2011_J.Physiol_589_4847
Author(s) : Zhong P , Pan B , Gao XP , Blankman JL , Cravatt BF , Liu QS
Ref : Journal de Physiologie , 589 :4847 , 2011
Abstract : The endocannabinoid (eCB) 2-arachidonoylglycerol (2-AG) is hydrolysed primarily by monoacylglycerol lipase (MAGL). Here, we investigated whether eCB-mediated retrograde synaptic depression in cerebellar slices was altered in MAGL knockout (MAGL(-/-)) mice. Depolarization-induced suppression of excitation (DSE) and metabotropic glutamate receptor (mGluR1)-mediated synaptic depression are mediated by 2-AG-induced activation of CB(1) receptors. We show that genetic deletion of MAGL prolonged DSE at parallel fibre (PF) or climbing fibre (CF) to Purkinje cell (PC) synapses. Likewise, mGluR1-mediated synaptic depression, induced either by high-frequency stimulation of PF or mGluR1 agonist DHPG, was prolonged in MAGL(-/-) mice. About 15% of 2-AG in the brain is hydrolysed by serine hydrolase alpha-beta-hydrolase domain 6 and 12 (ABHD6 and ABHD12). However, the selective ABHD6 inhibitor WWL123 had no significant effect on cerebellar DSE in MAGL(+/+) and (-/-) mice. The CB(1) receptor antagonist SR141716 significantly increased the amplitude of basal excitatory postsynaptic currents (EPSCs) in MAGL(-/-) mice but not in MAGL(+/+) mice. Conversely, the CB(1) agonist WIN55212 induced less depression of basal EPSCs in MAGL(-/-) mice than in MAGL(+/+) mice. These results provide genetic evidence that inactivation of 2-AG by MAGL determines the time course of eCB-mediated retrograde synaptic depression and that genetic deletion of MAGL causes tonic activation and consequential desensitization of CB(1) receptors.
ESTHER : Zhong_2011_J.Physiol_589_4847
PubMedSearch : Zhong_2011_J.Physiol_589_4847
PubMedID: 21911610
Gene_locus related to this paper: human-MGLL , mouse-MGLL

Title : Chronic monoacylglycerol lipase blockade causes functional antagonism of the endocannabinoid system - Schlosburg_2010_Nat.Neurosci_13_1113
Author(s) : Schlosburg JE , Blankman JL , Long JZ , Nomura DK , Pan B , Kinsey SG , Nguyen PT , Ramesh D , Booker L , Burston JJ , Thomas EA , Selley DE , Sim-Selley LJ , Liu QS , Lichtman AH , Cravatt BF
Ref : Nat Neurosci , 13 :1113 , 2010
Abstract : Prolonged exposure to drugs of abuse, such as cannabinoids and opioids, leads to pharmacological tolerance and receptor desensitization in the nervous system. We found that a similar form of functional antagonism was produced by sustained inactivation of monoacylglycerol lipase (MAGL), the principal degradative enzyme for the endocannabinoid 2-arachidonoylglycerol. After repeated administration, the MAGL inhibitor JZL184 lost its analgesic activity and produced cross-tolerance to cannabinoid receptor (CB1) agonists in mice, effects that were phenocopied by genetic disruption of Mgll (encoding MAGL). Chronic MAGL blockade also caused physical dependence, impaired endocannabinoid-dependent synaptic plasticity and desensitized brain CB1 receptors. These data contrast with blockade of fatty acid amide hydrolase, an enzyme that degrades the other major endocannabinoid anandamide, which produced sustained analgesia without impairing CB1 receptors. Thus, individual endocannabinoids generate distinct analgesic profiles that are either sustained or transitory and associated with agonism and functional antagonism of the brain cannabinoid system, respectively.
ESTHER : Schlosburg_2010_Nat.Neurosci_13_1113
PubMedSearch : Schlosburg_2010_Nat.Neurosci_13_1113
PubMedID: 20729846

Title : A general model of synaptic transmission and short-term plasticity - Pan_2009_Neuron_62_539
Author(s) : Pan B , Zucker RS
Ref : Neuron , 62 :539 , 2009
Abstract : Some synapses transmit strongly to action potentials (APs), but weaken with repeated activation; others transmit feebly at first, but strengthen with sustained activity. We measured synchronous and asynchronous transmitter release at "phasic" crayfish neuromuscular junctions (NMJs) showing depression and at facilitating "tonic" junctions, and define the kinetics of depression and facilitation. We offer a comprehensive model of presynaptic processes, encompassing mobilization of reserve vesicles, priming of docked vesicles, their association with Ca(2+) channels, and refractoriness of release sites, while accounting for data on presynaptic buffers governing Ca(2+) diffusion. Model simulations reproduce many experimentally defined aspects of transmission and plasticity at these synapses. Their similarity to vertebrate central synapses suggests that the model might be of general relevance to synaptic transmission.
ESTHER : Pan_2009_Neuron_62_539
PubMedSearch : Pan_2009_Neuron_62_539
PubMedID: 19477155

Title : Blockade of 2-arachidonoylglycerol hydrolysis by selective monoacylglycerol lipase inhibitor 4-nitrophenyl 4-(dibenzo[d][1,3]dioxol-5-yl(hydroxy)methyl)piperidine-1-carboxylate (JZL184) Enhances retrograde endocannabinoid signaling - Pan_2009_J.Pharmacol.Exp.Ther_331_591
Author(s) : Pan B , Wang W , Long JZ , Sun D , Hillard CJ , Cravatt BF , Liu QS
Ref : Journal of Pharmacology & Experimental Therapeutics , 331 :591 , 2009
Abstract : Endocannabinoid (eCB) signaling mediates depolarization-induced suppression of excitation (DSE) and inhibition (DSI), two prominent forms of retrograde synaptic depression. N-Arachidonoylethanolamine (AEA) and 2-arachidonoylglycerol (2-AG), two known eCBs, are degraded by fatty acid amide hydrolase (FAAH) and monoacylglycerol lipase (MAGL), respectively. Selective blockade of FAAH and MAGL is critical for determining the roles of the eCBs in DSE/DSI and understanding how their action is regulated. 4-Nitrophenyl 4-(dibenzo[d][1,3]dioxol-5-yl(hydroxy)methyl)piperidine-1-carboxylate (JZL184) is a recently developed, highly selective, and potent MAGL inhibitor that increases 2-AG but not AEA concentrations in mouse brain. Here, we report that JZL184 prolongs DSE in Purkinje neurons in cerebellar slices and DSI in CA1 pyramidal neurons in hippocampal slices. The effect of JZL184 on DSE/DSI is mimicked by the nonselective MAGL inhibitor methyl arachidonyl fluorophosphonate. In contrast, neither the selective FAAH inhibitor cyclohexylcarbamic acid 3'-carbomoylbiphenyl-3-yl ester (URB597) nor FAAH knockout has a significant effect on DSE/DSI. JZL184 produces greater enhancement of DSE/DSI in mouse neurons than that in rat neurons. The latter finding is consistent with biochemical studies showing that JZL184 is more potent in inhibiting mouse MAGL than rat MAGL. These results indicate that the degradation of 2-AG by MAGL is the rate-limiting step that determines the time course of DSE/DSI and that JZL184 is a useful tool for the study of 2-AG-mediated signaling.
ESTHER : Pan_2009_J.Pharmacol.Exp.Ther_331_591
PubMedSearch : Pan_2009_J.Pharmacol.Exp.Ther_331_591
PubMedID: 19666749