Di-deuterated linoleic acid ethyl ester

Di-deuterated ethyl linoleate (also known as RT001; di-deuterated linoleic acid ethyl ester, 11,11-d2-ethyl linoleate, ethyl 11,11-d2-linoleate)[1] is an experimental, orally-bioavailable synthetic deuterated polyunsaturated fatty acid (PUFA), an isotopologue of an essential omega-6 PUFA, linoleic acid. The deuterated compound, while identical to natural linoleic acid, is resistant to lipid peroxidation which makes studies of its cell-protective properties worthwhile.

Di-deuterated linoleic acid ethyl ester
Clinical data
Routes of
administration		Oral
ATC code
  • none
Legal status
Legal status
  • Investigational
Identifiers
CAS Number
PubChem CID
UNII
Chemical and physical data
FormulaC20H34D2O2
Molar mass310.5148 g/mol g·mol−1
3D model (JSmol)
Density0.88 g/cm3
Boiling point173–177 °C (343–351 °F)
 NY (what is this?)

Mechanism of action
An animated illustration of a chain reaction with slow elements

Di-deuterated linoleic acid is recognized by cells as identical to the natural linoleic acid. But when taken up, it is converted into 13,13-D2-arachidonic acid, a heavy isotope version of arachidonic acid, that gets incorporated into lipid membranes. The deuterated compound resists the non-enzymatic lipid peroxidation (LPO) through a non-antioxidant based mechanism that protects mitochondrial, neuronal and other lipid membranes, thereby greatly reducing the levels of numerous LPO-derived toxic products such as reactive carbonyls.[2]

Clinical development

Friedreich’s ataxia

A double-blind comparator-controlled Phase I/II clinical trial for Friedreich’s ataxia, sponsored by Retrotope and Friedreich’s Ataxia Research Alliance, was conducted to determine the safety profile and appropriate dosing for consequent trials.[3] RT001 was promptly absorbed and was found to be safe and tolerable over 28 days at the maximal dose of 9 g/day. It improved peak workload and peak oxygen consumption in the test group compared to the control group who received the equal doses of normal, non-deuterated ethyl linoleate.[4] Another randomised, double-blind, placebo-controlled clinical study began in 2019.[5]

Infantile neuroaxonal dystrophy

An open-label clinical study for infantile neuroaxonal dystrophy evaluating long-term evaluation of efficacy, safety, tolerability, and pharmacokinetics of RT001, which, when taken with food, can protect the neuronal cells from degeneration, started in the Summer 2018.[6]

Phospholipase 2G6-associated neurodegeneration

In 2017 FDA granted RT001 orphan drug designation in the treatment of phospholipase 2G6-associated neurodegeneration (PLAN).[7]

Amyotrophic lateral sclerosis

In 2018 RT001 was given to a patient with amyotrophic lateral sclerosis (ALS) under a "compassionate use scheme".[8]

Preclinical research

Alzheimer's disease

RT001 has been shown to be effective in a model of Alzheimer's disease in mice.[9]

References
  1. "9-cis, 12-cis-11,11-D2-Linoleic acid ethyl ester". PubChem.
  2. Hill S, Lamberson CR, Xu L, To R, Tsui HS, Shmanai VV, et al. (August 2012). "Small amounts of isotope-reinforced polyunsaturated fatty acids suppress lipid autoxidation". Free Radical Biology & Medicine. 53 (4): 893–906. doi:10.1016/j.freeradbiomed.2012.06.004. PMC 3437768. PMID 22705367.
  3. Clinical trial number NCT02445794 for "A First in Human Study of RT001 in Patients With Friedreich's Ataxia" at ClinicalTrials.gov
  4. Zesiewicz T, Heerinckx F, De Jager R, Omidvar O, Kilpatrick M, Shaw J, Shchepinov MS (July 2018). "Randomized, clinical trial of RT001: Early signals of efficacy in Friedreich's ataxia". Movement Disorders. 33 (6): 1000–1005. doi:10.1002/mds.27353. PMID 29624723.
  5. https://clinicaltrials.gov/ct2/show/NCT04102501
  6. Clinical trial number NCT03570931 for "A Study to Assess Efficacy and Safety of RT001 in Subjects With Infantile Neuroaxonal Dystrophy" at ClinicalTrials.gov
  7. "US FDA Grants Orphan Drug Designation for Retrotope's RT001 in the Treatment of Phospholipase 2G6 (PLA2G6)-Associated Neurodegeneration". Global Newswire. 2 November 2017.
  8. Inacio P (2018-09-18). "Experimental RT001 Now Available for ALS Under Expanded Access". ALS News Today.
  9. Butterfield DA, Halliwell B (March 2019). "Oxidative stress, dysfunctional glucose metabolism and Alzheimer disease". Nature Reviews. Neuroscience. 20 (3): 148–160. doi:10.1038/s41583-019-0132-6. PMID 30737462.
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