SR-14968: A Comprehensive Technical Overview

Chemical Identity

• IUPAC-naam: 3-[1-[1-(4-bromophenyl)ethyl]piperidin-4-yl]-5,6-dichloro-1H-benzimidazol-2-one
• Moleculaire formule: C₂₀H₂₀BrCl₂N₃O
• Molar Mass: 469.20 g/mol
• CAS-nummer: 2133455-40-8
• PubChem CID: 130431386​

Pharmacological Profile

SR-14968 is a synthetic compound classified as a G protein-biased agonist at the μ-opioid receptor (MOR). Unlike traditional opioids that activate both G protein and β-arrestin pathways, SR-14968 preferentially engages the G protein signaling cascade while exhibiting minimal recruitment of β-arrestin 2. This selective activation is associated with potent analgesic effects and a potentially improved side effect profile, particularly concerning respiratory depression and tolerance development.​

Werkingsmechanisme

The μ-opioid receptor is a G protein-coupled receptor (GPCR) that mediates the effects of endogenous opioids and opioid drugs. Upon activation by agonists, MOR can signal through two primary pathways:​

1. G Protein Pathway: Leads to analgesia and other therapeutic effects.
2. β-Arrestin Pathway: Associated with adverse effects such as respiratory depression, constipation, and tolerance.​

SR-14968 exhibits a strong bias towards the G protein pathway, thereby promoting analgesia while minimizing β-arrestin-mediated side effects. This bias is quantified by comparing the efficacy of the compound in activating G protein signaling versus β-arrestin recruitment.​

Farmacodynamica

• Analgesic Efficacy: In preclinical models, SR-14968 demonstrates potent antinociceptive effects. It effectively increases pain thresholds in assays such as the tail-flick and hot plate tests. Notably, its analgesic potency is comparable to that of morphine, with a potentially wider therapeutic window.​
• Respiratory Effects: Traditional opioids often cause dose-dependent respiratory depression, a leading cause of opioid-related fatalities. SR-14968, due to its G protein bias, exhibits reduced respiratory suppression in animal studies. This property suggests a lower risk of respiratory compromise at therapeutic doses.​
• Tolerance and Dependence: Chronic administration of opioids can lead to tolerance (requiring higher doses for the same effect) and physical dependence. SR-14968 has been shown to produce less tolerance development compared to morphine in certain pain models. However, it can still induce withdrawal symptoms upon abrupt cessation, indicating some potential for dependence.​

Farmacokinetiek

While specific pharmacokinetic data for SR-14968 are limited, its structural properties suggest favorable absorption and distribution characteristics. The presence of lipophilic groups may facilitate blood-brain barrier penetration, essential for central analgesic effects. Metabolic pathways and elimination profiles remain to be fully elucidated.

Dosering en toediening

In preclinical studies, SR-14968 has been administered intraperitoneally in rodents at doses ranging from 0.3 to 3 mg/kg. The effective analgesic dose varies depending on the pain model and the species studied. Translating these doses to human equivalents requires careful consideration and further clinical research.​

Bijwerkingen

While SR-14968 aims to reduce the side effect burden associated with traditional opioids, some adverse effects have been observed:​

• Central Nervous System: At higher doses, SR-14968 can induce sedation and motor impairment.​
• Maagdarmstelsel: Some studies report reduced gastrointestinal motility, though to a lesser extent than morphine.​
• Dependence: Withdrawal symptoms have been noted upon discontinuation, indicating potential for physical dependence.​

Harm Reduction Considerations

Given its opioid receptor activity, SR-14968 should be approached with caution:​

• Monitoring: Users should be monitored for signs of respiratory depression, especially at higher doses.​
• Titration: Doses should be titrated carefully to achieve the desired analgesic effect while minimizing side effects.​
• Combination Therapy: Avoid combining SR-14968 with other central nervous system depressants, such as alcohol or benzodiazepines, to reduce the risk of additive respiratory depression.​
• Withdrawal Management: Gradual tapering is recommended to mitigate withdrawal symptoms upon discontinuation.​

Conclusie

SR-14968 represents a promising advancement in opioid pharmacotherapy, offering potent analgesia with a potentially improved safety profile. Its G protein-biased mechanism may reduce the incidence of severe side effects commonly associated with traditional opioids. However, further clinical studies are necessary to fully understand its pharmacokinetics, optimal dosing strategies, and long-term safety in humans.develop harm reduction strategies to ensure patient safety.

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