Reserpine

1 Catharanthus sp. 2 Ochrosia sp. 3 Rauvolfia sp. 4 Vinca sp. 5 Voacanga sp.

Reserpine is an inhibitor of the vesicular monoamine transporter 2 (VMAT2).

In Vitro:Reserpine is an inhibitor of the vesicular monoamine transporter 2 (VMAT2). Reserpine displays a significant effect on the density of dopamine D1 receptors (F2,12=8.81, p<0.01) in the rat striatum. The affinity (Kd) for the dopamine D1 and D2 receptors during withdrawal from acute and chronic administration of reserpine is not change[1]. IC50 values of 43.9 and 54.9 μM are obtained after 1 day of treatment with Reserpine in JB6 P+ and HepG2-C8 cells, respectively. Reserpine induces luciferase activity in a dose-dependent manner at concentrations ranging from 5 to 50 μM, and no significant induction is observed at concentrations lower than 5 μM. Results demonstrate that Reserpine (2.5 to 10 μM) also increases the protein expression of Nrf2, HO-1, and NQO1. Reserpine at concentrations of 2.5 to 10 μM decreases the mRNA expression of DNMT1, DNMT3a, and DNMT3b in a concentration-dependent manner in JB6 P+ cells after 7 days of treatment. Reserpine at 10 μM generates a significant difference for DNMT3a expression (p<0.05)[2].

In Vivo:Withdrawal (48 h) from chronic (14-day) but not acute Reserpine administration in a dose of 0.2 mg/kg i.p. produces a significant reduction of the immobility time (F2,18=3.68, p<0.05), but increases the climbing time (F2,18=4.48, p<0.02), and does not change the swimming time (F2,18=1.78; NS) in the forced swim test (FST) in rats[1]. Reserpine at a dose of 5 mg/kg body weight produces significant increase in the urinary excretion profile of vanillylmandelic acid (VMA) compare to control animals. The amount of 5-hydroxyindoleacetic acid (5-HIAA) excreted in animals treated with Reserpine is found to be more than in the control. Dose dependent hypotension is observed with Reserpine. Reserpine at doses of 0.5, 1, 5, 10 and 15 μg/kg produce significant (p<0.01) reduction in blood pressure compare to control[3].

References:
[1]. Antkiewicz-Michaluk L, et al. Withdrawal from repeated administration of a low dose of reserpine induced opposing adaptive changes in the noradrenaline and serotonin system function: a behavioral and neurochemical ex vivo and in vivo studies in the rat. Prog Neuropsychopharmacol Biol Psychiatry. 2015 Mar 3;57:146-54. [2]. Hong B, et al. Reserpine Inhibit the JB6 P+ Cell Transformation Through Epigenetic Reactivation of Nrf2-Mediated Anti-oxidative Stress Pathway. AAPS J. 2016 May;18(3):659-69. [3]. Sreemantula S, et al. Reserpine methonitrate, a novel quaternary analogue of reserpine augments urinary excretion of VMA and 5-HIAA without affecting HVA in rats. BMC Pharmacol. 2004 Nov 16;4:30.

Cytotoxicity of the indole alkaloid reserpine from Rauwolfia serpentina against drug-resistant tumor cells.[Pubmed:25765838]

Phytomedicine. 2015 Feb 15;22(2):308-18.

BACKGROUND: The antihypertensive Reserpine is an indole alkaloid from Rauwolfia serpentina and exerts also profound activity against cancer cells in vitro and in vivo. The present investigation was undertaken to investigate possible modes of action to explain its activity toward drug-resistant tumor cells. MATERIAL AND METHODS: Sensitive and drug-resistant tumor cell lines overexpressing P-glycoprotein (ABCB1/MDR1), breast cancer resistance protein (ABCG2/BCRP), mutation-activated epidermal growth factor receptor (EGFR), wild-type and p53-knockout cells as well as the NCI panel of cell lines from different tumor origin were analyzed. Reserpine's cytotoxicity was investigated by resazurin and sulforhodamine assays, flow cytometry, and COMPARE and hierarchical cluster analyses of transcriptome-wide microarray-based RNA expressions. RESULTS: P-glycoprotein- or BCRP overexpressing tumor cells did not reveal cross-resistance to Reserpine. EGFR-overexpressing cells were collateral sensitive and p53- Knockout cells cross-resistant to this drug compared to their wild-type parental cell lines. Reserpine increased the uptake of doxorubicin in P-glycoprotein-overexpressing cells, indicating that Reserpine inhibited the efflux function of P-glycoprotein. Using molecular docking, we found that Reserpine bound with even higher binding energy to P-glycoprotein and EGFR than the control drugs verapamil (P-glycoprotein inhibitor) and erlotinib (EGFR inhibitor). COMPARE and cluster analyses of microarray data showed that the mRNA expression of a panel of genes predicted the sensitivity or resistance of the NCI tumor cell line panel with statistical significance. The genes belonged to diverse pathways and biological functions, e.g. cell survival and apoptosis, EGFR activation, regulation of angiogenesis, cell mobility, cell adhesion, immunological functions, mTOR signaling, and Wnt signaling. CONCLUSION: The lack of cross-resistance to most resistance mechanisms and the collateral sensitivity in EGFR-transfectants compared to wild-type cells speak for a promising role of Reserpine in cancer chemotherapy. Reserpine deserves further consideration for cancer therapy in the clinical setting.

Protective effect of nebivolol on reserpine-induced neurobehavioral and biochemical alterations in rats.[Pubmed:23871717]

Neurochem Int. 2013 Oct;63(4):316-21.

Reserpine-induced orofacial dyskinesia is a model that shares some mechanists' aspects with tardive dyskinesia whose pathophysiology has been related to oxidative stress. The present study was aimed to explore neuroprotective effects of nebivolol, an antihypertensive agent, on Reserpine-induced neurobehavioral and biochemical alterations in rats. Reserpine (1mg/kg, s.c.) was used to induce neurotoxicity. Administration of Reserpine for 3 days every other day significantly increased the vacuous chewing movements (VCMs), tongue protrusions (TPs) and reduced the locomotor activity in rats. Pre-treatment with nebivolol (5 and 10mg/kg, p.o. for 5 days) showed dose dependant decrease in VCMs and TP induced by Reserpine. Nebivolol also showed significant improvement in locomotor activity. Reserpine significantly increased lipid peroxidation and reduced the levels of defensive antioxidant enzymes like catalase (CAT), superoxide dismutase (SOD) and reduced glutathione (GSH) in rat brain. Nebivolol reversed these effects of Reserpine on oxidative stress indices; indicating amelioration of oxidative stress in rat brains. The results of the present study indicated that nebivolol has a protective role against Reserpine-induced orofacial dyskinesia. Thus, the use of nebivolol as a therapeutic agent for the treatment of tardive dyskinesia may be considered.

Attenuation of reserpine-induced pain/depression dyad by gentiopicroside through downregulation of GluN2B receptors in the amygdala of mice.[Pubmed:24584520]

Neuromolecular Med. 2014 Jun;16(2):350-9.

Epidemiological studies demonstrate that pain frequently occurs comorbid with depression. Gentiopicroside (Gent) is a secoiridoid compound isolated from Gentiana lutea that exhibits analgesic properties and inhibits the expression of GluN2B-containing N-methyl-D-aspartate (NMDA) receptors in the anterior cingulate cortex of mice. However, the effects of Gent on the Reserpine-induced pain/depression dyad and its underlying mechanisms are unclear. Reserpine administration (1 mg/kg subcutaneous daily for 3 days) caused a significant decrease in the nociceptive threshold as evidenced by the reduced paw withdrawal latency in response to a radiant heat source and mechanical allodynia. Behavioral detection indicated a significant increase in immobility time during a forced swim test, as well as decreased time in the central area and total travel distance in an open field test. Furthermore, reserpinized animals exhibited increased oxidative stress. Systemic Gent administration dose-dependently ameliorated the behavioral deficits associated with Reserpine-induced pain/depression dyad. At the same time, the decrease in biogenic amine levels (norepinephrine, dopamine, and serotonin) was integrated with the increase in caspase-3 levels and GluN2B-containing NMDA receptors in the amygdala of the Reserpine-injected mice. Gent significantly reversed the changes in the levels of biogenic amines, caspase-3, and GluN2B-containing NMDA receptors in amygdala. However, Gent did not affect the expression of GluN2A-containing NMDA receptors. The inhibitory effects of Gent on oxidative stress were occluded by simultaneous treatment of GluN2B receptors antagonist Ro25-6981. Our study provides strong evidence that Gent inhibits Reserpine-induced pain/depression dyad by downregulating GluN2B receptors in the amygdala.

Reserpine ameliorates Abeta toxicity in the Alzheimer's disease model in Caenorhabditis elegans.[Pubmed:19264117]

Exp Gerontol. 2009 Jun-Jul;44(6-7):462-6.

Earlier we have reported that Reserpine, an antihypertensive drug, known to downregulate biogenic amines through inhibition of the vesicular monoamine transporter (VMAT), increases longevity of Caenorhabditis elegans with a high quality of life, namely, enhanced and prolonged mobility (Srivastava et al., 2008). As neurodegenerative diseases are of adult onset, we addressed the protective ability of Reserpine against neurodegenerative diseases, especially Alzheimer's disease (AD). In the well established AD model in C. elegans, Amyloid beta (Abeta) is expressed in the muscles and Abeta toxicity is manifested as paralysis (Link, 1995). In this model, Reserpine significantly delayed paralysis and increased the longevity. In addition, Reserpine provided thermotolerance, but interestingly the Abeta transcript and expression levels remains grossly unchanged.

Cognitive, motor and tyrosine hydroxylase temporal impairment in a model of parkinsonism induced by reserpine.[Pubmed:23831411]

Behav Brain Res. 2013 Sep 15;253:68-77.

Studies have suggested that cognitive deficits can precede motor alterations in Parkinson's disease (PD). However, in general, classic animal models are based on severe motor impairment after one single administration of neurotoxins, and thereby do not express the progressive nature of the pathology. A previous study showed that the repeated administration with a low dose (0.1mg/kg) of the monoamine depleting agent Reserpine induces a gradual appearance of motor signs of pharmacological parkinsonism in rats. Here, we showed this repeated treatment with Reserpine induced a memory impairment (evaluated by the novel object recognition task) before the gradual appearance of the motor signs. Additionally, these alterations were accompanied by decreased tyrosine hydroxylase (TH) striatal levels and reduced number of TH+ cells in substantia nigra pars compacta (SNpc). After 30 days without treatment, Reserpine-treated animals showed normal levels of striatal TH, partial recovery of TH+ cells in SNpc, recovery of motor function, but not reversal of the memory impairment. Furthermore, the motor alterations were statistically correlated with decreased TH levels (GD, CA1, PFC and DS) and number of TH+ cells (SNpc and VTA) in the brain. Thus, we extended previous results showing that the gradual appearance of motor impairment induced by repeated treatment with a low dose of Reserpine is preceded by short-term memory impairment, as well as accompanied by neurochemical alterations compatible with the pathology of PD.

Inhibitory effect of reserpine on dopamine transporter function.[Pubmed:12450567]

Eur J Pharmacol. 2002 Dec 5;456(1-3):39-43.

Previous studies indicate that Reserpine may disrupt dopamine transporter activity. Results presented herein reveal that it also inhibits potently synaptosomal [3H]dopamine uptake. In addition, Reserpine administration to rats decreased the V(max) of synaptosomal dopamine transport, as assessed ex vivo 12 h after treatment. This decrease appeared, at least in part, dissociated from concurrent inhibition of the vesicular monoamine transporter-2 (VMAT-2). In separate experiments, synaptosomal dopamine uptake did not differ between wild-type and heterozygous VMAT-2 knockout mice, and Reserpine treatment did not inhibit [3H]dopamine uptake into cells heterogously expressing the human dopamine transporter. Taken together, these data suggest that Reserpine may transiently alter dopamine transporter function in a noncompetitive, indirect manner.

Effect of reserpine on behavioural responses to agonists at 5-HT1A, 5-HT1B, 5-HT2A, and 5-HT2C receptor subtypes.[Pubmed:10465692]

Neuropharmacology. 1999 Jun;38(6):883-91.

Rats were given a single dose of Reserpine (5 mg/kg s.c.) and behavioural responses to agonists at 5-HT receptor subtypes compared with those of control animals 21 days later. The following effects of activating postsynaptic 5-HT1A receptors by the agonist 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT) were significantly increased: tail-flick, reciprocal forepaw treading, flat body posture. The hyperphagic effect of activating presynaptic 5-HT1A receptors by 8-OH-DPAT tended to increase and hypothermia on activating postsynaptic 5-HT1A sites tended to decrease. The hyperlocomotor effect of activating 5-HT1A sites also tended to decrease possibly as a result of a dependence of this response on the known depletion of catecholamines by Reserpine. Head shakes on activating 5-HT2A receptors by 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI) and two effects of activating 5-HT2C receptors by 1-(3-chlorophenyl) piperazine (mCPP) were significantly increased (hypophagia, anxiety) and a third effect, hypolocomotion tended to increase but hypophagia on activating postsynaptic 5-HT1B receptors by CP-94, 253 was significantly attenuated. The results are discussed with particular reference to altered 5-HT function in depression.

Reserpine binding to a vesicular amine transporter expressed in Chinese hamster ovary fibroblasts.[Pubmed:8416935]

J Biol Chem. 1993 Jan 5;268(1):29-34.

The potent antihypertensive drug Reserpine inhibits the transport of biogenic amines into adrenal chromaffin granules and synaptic vesicles. Reserpine acts by binding almost irreversibly to the vesicular amine transporter, and this interaction has been used both to study the mechanism of transport and to purify the protein responsible. Recent isolation of a cDNA for the rat chromaffin granule amine transporter (CGAT) by selection in the neurotoxin 1-methyl-4-phenylpyridinium now permits an analysis of the interaction with Reserpine at a molecular level. Using membranes from stable transformants expressing the transporter, we show that Reserpine binds specifically and quantitatively to CGAT. As with the native protein in bovine chromaffin granules, a pH gradient accelerates Reserpine binding, and amine substrates compete for binding with Reserpine. However, 1-methyl-4-phenylpyridinium and tetrabenazine, the other principal inhibitor of vesicular amine transport, compete very poorly with Reserpine for binding, suggesting that they interact with CGAT at distinct sites.

Evacetrapib is a potent and selective of CETP inhibitor, which inhibits human recombinant CETP protein (IC50 5.5 nM) and CETP activity in human plasma (IC50 36 nM) in vitro.

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