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The Effects of Ibogaine on Uterine Smooth Muscle Contractions: Relation to the Activity of Antioxidant Enzymes

/ Iboga / Ibogaine, Neuroscience, Papers, Psychiatry & Medicine, Publications, Substance Use Disorder / / , , , , , ,

Abstract

Ibogaine is an indole alkaloid originally extracted from the root bark of the African rainforest shrub Tabernanthe iboga. It has been explored as a treatment for substance abuse because it interrupts drug addiction and relieves withdrawal symptoms. However, it has been shown that ibogaine treatment leads to a sharp and transient fall in cellular ATP level followed by an increase of cellular respiration and ROS production. Since contractile tissues are sensitive to changes in the levels of ATP and ROS, here we investigated an ibogaine-mediated link between altered redox homeostasis and uterine contractile activity. We found that low concentrations of ibogaine stimulated contractile activity in spontaneously active uteri, but incremental increase of doses inhibited it. Inhibitory concentrations of ibogaine led to decreased SOD1 and elevated GSH-Px activity, but doses that completely inhibited contractions increased CAT activity. Western blot analyses showed that changes in enzyme activities were not due to elevated enzyme protein concentrations but posttranslational modifications. Changes in antioxidant enzyme activities point to a vast concentration-dependent increase in H2O2 level. Knowing that extracellular ATP stimulates isolated uterus contractility, while H2O2 has an inhibitory effect, this concentration-dependent stimulation/inhibition could be linked to ibogaine-related alterations in ATP level and redox homeostasis.
Oreščanin-Dušić, Z., Tatalović, N., Vidonja-Uzelac, T., Nestorov, J., Nikolić-Kokić, A., Mijušković, A., … & Blagojević, D. (2018). The Effects of Ibogaine on Uterine Smooth Muscle Contractions: Relation to the Activity of Antioxidant Enzymes. Oxidative medicine and cellular longevity, 2018. 10.1155/2018/5969486
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Evaluating the abuse potential of psychedelic drugs for medical use in humans

/ LSD, MDMA, Mushrooms / Psilocybin, Papers, Psychiatry & Medicine, Psychology, Publications, Salvia / Salvinorin A, Substance Use Disorder / / , ,

Abstract

Psychedelics comprise drugs come from various pharmacological classes including 5-HT2A agonists, indirect 5-HT agonists, e.g. MDMA, NMDA antagonists and κ-opioid receptor agonists. There is resurgence in developing psychedelics to treat psychiatric disorders with high unmet clinical need. Many, but not all, psychedelics are schedule 1 controlled drugs (CDs), i.e. no approved medical use. For existing psychedelics in development, regulatory approval will require a move from schedule 1 to a CD schedule for drugs with medical use, i.e. schedules 2-5. Although abuse of the psychedelics is well documented, a systematic preclinical and clinical evaluation of the risks they pose in a medical-use setting does not exist. We describe the non-clinical tests required for a regulatory evaluation of abuse/dependence risks, i.e. drug-discrimination, intravenous self-administration and physical dependence liability. A synopsis of the existing data for the various types of psychedelics is provided and we describe our findings with psychedelic drugs in these models. FDA recently issued its guidance on abuse/dependence evaluation of drug-candidates [59]. We critically review the guidance, discuss the impact this document will have on non-clinical abuse/dependence testing, and offer advice on how non-clinical abuse/dependence experiments can be designed to meet not only the expectations of FDA, but also other regulatory agencies. Finally, we offer views on how these non-clinical tests can be refined to provide more meaningful information to aid the assessment of the risks posed by CNS drug-candidates for abuse and physical dependence.
Heal, D. J., Gosden, J., & Smith, S. L. (2018). Evaluating the abuse potential of psychedelic drugs for medical use in humans. Neuropharmacology. 10.1016/j.neuropharm.2018.01.049
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Tolerance and Tachyphylaxis to Head Twitches Induced by the 5-HT2A Agonist 25CN-NBOH in Mice

/ Neuroscience, Papers, Publications / / , ,

Abstract

The serotonin (5-HT) 2A receptor is the primary molecular target of serotonergic hallucinogens, which trigger large-scale perturbations of the cortex. Our understanding of how 5-HT2A activation may cause the effects of hallucinogens has been hampered by the receptor unselectivity of most of the drugs of this class. Here we used 25CN-NBOH (N-(2-hydroxybenzyl)-2,5-dimethoxy-4-cyanophenylethylamine), a newly developed selective 5-HT2A agonist, and tested it with regard to the head-twitch-response (HTR) model of 5-HT2A activity and effects on locomotion. 25CN-NBOH evoked HTRs with an inverted u-shape-like dose-response curve and highest efficacy at 1.5 mg/kg, i.p. HTR occurrence peaked within 5 min after agonist injection, and exponentially decreased to half-maximal frequency at ~11 min. Thorough habituation to the experimental procedures (including handling, saline injection, and exposure to the observational boxes 1 day before the experiment) facilitated the animals’ response to 25CN-NBOH. 25CN-NBOH (1.5 mg/kg, i.p.) induced HTRs were blocked by the 5-HT2Aantagonist ketanserin (0.75 mg/kg, 30 min pre), but not by the 5-HT2C antagonist SB-242084 (0.5 mg/kg, i.p., 30 min pre). SB-242084 instead slightly increased the number of HTRs occurring at a 3.0-mg/kg dose of the agonist. Apart from HTR induction, 25CN-NBOH also modestly increased locomotor activity of the mice. Repeated once-per-day injections (1.5 mg/kg, i.p.) led to reduced occurrence of 25CN-NBOH induced HTRs. This intermediate tolerance was augmented when a second (higher) dose of the drug (3.0 mg/kg) was interspersed. Short-interval tolerance (i.e., tachyphylaxis) was observed when the drug was injected twice at intervals of 1.0 and 1.5 h at either dose tested (1.5 mg/kg and 0.75 mg/kg, respectively). Inducing ketanserin-sensitive HTRs, which are dependent on environmental valences and which show signs of tachyphylaxis and tolerance, 25CN-NBOH shares striking features common to serotonergic hallucinogens. Given its distinct in vitro selectivity for 5-HT2A over non5-HT2 receptors and its behavioral dynamics, 25CN-NBOH appears to be a powerful tool for dissection of receptor-specific cortical circuit dynamics, including 5-HT2A related psychoactivity.
Buchborn, T., Lyons, T., & Knöpfel, T. (2018). Tolerance and Tachyphylaxis to Head Twitches Induced by the 5-HT2A Agonist 25CN-NBOH in Mice. Frontiers in Pharmacology, 9, 17. 10.3389/fphar.2018.00017
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Is LSD toxic?

/ LSD, Papers, Psychology, Publications / / ,

Abstract

LSD (lysergic acid diethylamide) was discovered almost 75 years ago, and has been the object of episodic controversy since then. While initially explored as an adjunctive psychiatric treatment, its recreational use by the general public has persisted and on occasion has been associated with adverse outcomes, particularly when the drug is taken under suboptimal conditions. LSD’s potential to cause psychological disturbance (bad trips) has been long understood, and has rarely been associated with accidental deaths and suicide. From a physiological perspective, however, LSD is known to be non-toxic and medically safe when taken at standard dosages (50–200 μg). The scientific literature, along with recent media reports, have unfortunately implicated “LSD toxicity” in five cases of sudden death. On close examination, however, two of these fatalities were associated with ingestion of massive overdoses, two were evidently in individuals with psychological agitation after taking standard doses of LSD who were then placed in maximal physical restraint positions (hogtied) by police, following which they suffered fatal cardiovascularcollapse, and one case of extreme hyperthermia leading to death that was likely caused by a drug substituted for LSD with strong effects on central nervous system temperature regulation (e.g. 25i-NBOMe). Given the renewed interest in the therapeutic potential of LSD and other psychedelic drugs, it is important that an accurate understanding be established of the true causes of such fatalities that had been erroneously attributed to LSD toxicity, including massive overdoses, excessive physical restraints, and psychoactive drugs other than LSD.

Nichols, D. E., & Grob, C. S. (2018). Is LSD toxic?. Forensic science international, 284, 141-145. 10.1016/j.forsciint.2018.01.006
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A Single Dose Of Ayahuasca Modulates Salivary Cortisol In Treatment-Resistant Depression

/ Ayahuasca, Depressive Disorders, Neuroscience, Papers, Psychology, Publications / / , , , , , ,

Abstract

Major depression is a highly prevalent mood disorder, affecting about 350 million people, and around 30% of the patients are resistant to currently available antidepressant medications. Recent evidence from a randomized placebo-controlled trial supports the rapid antidepressant effects of the psychedelic ayahuasca in treatment-resistant depression. The aim of this study was to explore the effect of ayahuasca on plasma cortisol and awakening salivary cortisol response, in the same group of treatment-resistant patients and in healthy volunteers. Subjects received a single dose of ayahuasca or placebo, and both plasma and awakening salivary cortisol response were measured at baseline (before dosing) and 48h after the dosing session. Baseline assessment (D0) showed blunted awakening salivary cortisol response and hypocortisolemia in patients (DM), both with respect to healthy controls group (C). Salivary cortisol also was measured during dosing session and we observed a large increased for both C and DM that ingested ayahuasca, than placebo groups. After 48h of the dosing session (D2) with ayahuasca, awakening salivary cortisol response (for both sexes) of treated patients became similar to levels detected in controls. This was not observed in patients that ingested placebo. No changes in plasma cortisol were observed after 48 hours of ayahuasca or placebo ingestion for both groups and sexes. Therefore, these findings point to new evidence of modulation of ayahuasca on salivary cortisol levels, as cortisol acts in regulation of distinct physiological pathways, emotional and cognitive processes related to etiology of depression, this modulation could be an important part of the antidepressant effects observed with ayahuasca. Moreover, this study highlights the importance of psychedelics in the treatment of human mental disorders.

Galvao, A. C. M., Almeida, R. N., dos Santos Silva, E. A., de Morais Freire, F. A., Palhano-Fontes, F., Onias, H., … & Galvao-Coelho, N. L. (2018). A Single Dose Of Ayahuasca Modulates Salivary Cortisol In Treatment-Resistant Depression. bioRxiv, 257238. 10.1101/257238
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Acute antidepressant effect of ayahuasca in juvenile non-human primate model of depression

/ Ayahuasca, Depressive Disorders, Papers, Psychology, Publications / / , , , , , ,

Abstract

The incidence of major depression in adolescents, aged between 15 to 18 years, reaches approximately 14%. Usually, this disorder presents a recurrent way, without remission of symptoms even after several pharmacological treatments, persisting through adult life. Due to the relatively low efficacy of commercially available antidepressant, new pharmacological therapies are under continuous exploration. Recent evidence suggests that classic psychedelics, such as ayahuasca, produce rapid and robust antidepressant effects in treatment-resistant depression patients. In this study, we evaluated the potential of antidepressant effects of ayahuasca in a juvenile model of depression in a non-human primate, common marmoset (Callithrix jacchus). The model induces depressive-like symptoms by chronic social isolation (60 days) and antidepressant effects monitoring included fecal cortisol, body weight, and behavioral parameters. The animals presented hypocortisolemia and the recovery of cortisol to baseline levels started already at 24h after the ingestion of ayahuasca, but not the vehicle. Moreover, in males, ayahuasca, and not the vehicle, reduced the scratching, a stereotypic behavior, and increased the feeding. Ayahuasca also improving body weight to baseline levels in male and female common marmosets. The behavioral response induced by ayahuasca shows long effect, lasting 14 days. Therefore, for this translational animal model of juvenile depression, it could be proposed that ayahuasca treatment presented more notable antidepressant effects than tricyclic antidepressant nortriptyline, investigated by our group, using this same protocol in an anterior study. Ayahuasca produced faster and more durable effect on reversion of physiological changes and depressive-like symptoms. Therefore, the results found for ayahuasca treatment corroborates in the validation of this substance as an effective antidepressant drug and encourages the return of studies with psychedelic drugs in the treatment of humor disorders, including adolescents with early-age depression.

da Silva, F. S., dos Santos Silva, E. A., de Sousa Junior, G. M., Maia-de-Oliveira, J. P., Rachetti, V. D. P. S., de Araujo, D. B., … & Galvao-Coelho, N. L. (2018). Acute antidepressant effect of ayahuasca in juvenile non-human primate model of depression. bioRxiv, 254268. 10.1101/254268
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Ayahuasca: Psychological And Physiologic Effects, Pharmacology And Potential Uses In Addiction And Mental Illness

/ Ayahuasca, Depressive Disorders, Papers, Psychology, Publications, Substance Use Disorder / / , , ,

Abstract

Ayahuasca, a traditional Amazonian decoction with psychoactive properties, is made from bark of the Banisteriopsis caapi vine (contains beta-carboline alkaloids) and leaves of the Psychotria viridis bush (supply the hallucinogen N,N-dimethyltryptamine (DMT)). Originally used by indigenous shamans for the purposes of spirit communication, magical experiences, healing, and religious rituals, across several South American countries ayahuasca has been incorporated into folk medicine and spiritual healing, and several Brazilian churches use it routinely to foster spiritual experience. More recently it is being used in Europe and North America, not only for religious or healing reasons, but also for recreation.
OBJECTIVE:
To review ayahuasca’s behavioral effects, possible adverse effects, proposed mechanisms of action and potential clinical uses in mental illness.
METHOD:
We searched Medline, in English, using the terms ayahuasca, dimethytryptamine, Banisteriopsis caapi, and Psychotria viridis and reviewed the relevant publications.
RESULTS:
The following aspects of ayahuasca are summarized: Political and legal factors; acute and chronic psychological effects; electrophysiological studies and imaging; physiological effects, safety and adverse effects; pharmacology; potential psychiatric uses.
CONCLUSION:
Many years of shamanic wisdom have indicated potential therapeutic uses for ayahuasca, and many present day studies suggest that it may be useful for treating various psychiatric disorders and addictions. The side effect profile appears to be relatively mild, but more detailed studies need to be done. Several prominent researchers feel that government regulations with regard to ayahuasca should be relaxed so that it could be provided more readily to recognized credible researchers to conduct comprehensive clinical trials.
Hamill, J., Hallak, J., Dursun, S. M., & Baker, G. (2018). Ayahuasca: Psychological And Physiologic Effects, Pharmacology And Potential Uses In Addiction And Mental Illness. Current neuropharmacology. 10.2174/1570159X16666180125095902
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Ketamine Use for Suicidal Ideation in the General Hospital: Case Report and Short Review

/ Depressive Disorders, Ketamine, Papers, Psychology, Publications / / , , , , , ,

Abstract

Low-dose infusion of ketamine may have rapid antisuicide properties. Such a treatment may therefore be useful in the general hospital to prevent suicide in an environment that cannot be made safe enough. We report on the use of ketamine as an efficient, well-tolerated treatment for persistent suicidal ideation in a patient hospitalized in a general hospital after a severe suicide attempt. Based on data in the literature, we suggest that the benefit-risk ratio for ketamine use in such a context is highly favorable.
Vulser, H., Vulser, C., Rieutord, M., Passeron, A., Lefebvre, D., Baup, E., … & Lemogne, C. (2018). Ketamine use for suicidal ideation in the general hospital: case report and short review. Journal of Psychiatric Practice®, 24(1), 56-59. 10.1097/PRA.0000000000000282
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The effect of Banisteriopsis caapi (B. caapi) on the motor deficits in the MPTP-treated common marmoset model of Parkinson’s disease

/ Ayahuasca, Neuroscience, Papers, Psychiatry & Medicine, Publications / / , , , , , ,

Abstract

Banisteriopsis caapi (B. caapi) contains harmine, harmaline, and tetrahydroharmine, has monoamine oxidase inhibitory activity, and has reported antiparkinsonian activity in humans when imbibed as a tea; however, its effects are poorly documented. For this reason, motor function was assessed in 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-treated common marmosets following administration of B. caapi extract (28.4–113.6 mg/kg; po), harmine (0.1 and 0.3 mg/kg; sc), and selegiline (10 mg/kg; sc), alone or with a submaximal dose of L-3,4-dihydroxyphenylalanine (L-DOPA; 4–7 mg/kg). L-DOPA reversed motor disability, increased locomotor activity, and induced moderate dyskinesia. B. caapi did not increase locomotor activity or induce dyskinesia but at 56.8 and 113.6 mg/kg improved motor disability. The L-DOPA response was unaltered by co-administration of B. caapi. Harmine (0.1 and 0.3 mg/kg) produced a mild improvement in motor disability without affecting locomotor activity or dyskinesia but had no effect on the L-DOPA-induced antiparkinsonian response. Selegiline (10 mg/kg) alone improved motor function to the same extent as L-DOPA, but with only mild dyskinesia, and did not alter the response to L-DOPA, although dyskinesia was reduced. The findings suggest that B. caapi alone has a mild antiparkinsonian effect but does not enhance the L-DOPA response or reduce dyskinesia.
Fisher, R., Lincoln, L., Jackson, M. J., Abbate, V., Jenner, P., Hider, R., … & Rose, S. (2018). The effect of Banisteriopsis caapi (B. caapi) on the motor deficits in the MPTP‐treated common marmoset model of Parkinson’s disease. Phytotherapy Research. 10.1002/ptr.6017
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Taking Psychedelics Seriously

/ Anxiety Disorders / PTSD, Depressive Disorders, Ketamine, MDMA, Mushrooms / Psilocybin, Papers, Psychology, Publications / /

Abstract

Background: Psychiatric research in the 1950s and 1960s showed potential for psychedelic medications to markedly alleviate depression and suffering associated with terminal illness. More recent published studies have demonstrated the safety and efficacy of psilocybin, MDMA, and ketamine when administered in a medically supervised and monitored approach. A single or brief series of sessions often results in substantial and sustained improvement among people with treatment-resistant depression and anxiety, including those with serious medical conditions.

Need and Clinical Considerations: Palliative care clinicians occasionally encounter patients with emotional, existential, or spiritual suffering, which persists despite optimal existing treatments. Such suffering may rob people of a sense that life is worth living. Data from Oregon show that most terminally people who obtain prescriptions to intentionally end their lives are motivated by non-physical suffering. This paper overviews the history of this class of drugs and their therapeutic potential. Clinical cautions, adverse reactions, and important steps related to safe administration of psychedelics are presented, emphasizing careful patient screening, preparation, setting and supervision.

Conclusion: Even with an expanding evidence base confirming safety and benefits, political, regulatory, and industry issues impose challenges to the legitimate use of psychedelics. The federal expanded access program and right-to-try laws in multiple states provide precendents for giving terminally ill patients access to medications that have not yet earned FDA approval. Given the prevalence of persistent suffering and growing acceptance of physician-hastened death as a medical response, it is time to revisit the legitimate therapeutic use of psychedelics.

Byock, I. (2018). Taking Psychedelics Seriously. Journal of palliative medicine. 10.1089/jpm.2017.0684
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Psychedelic Listening: A Guided Music Journey with Wavepaths - October 29th

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