Abstract
Alzheimer disease represents a major public health issue with limited therapeutic interventions. We explored the possibility of therapeutic approach by repurposing of tramadol in a sporadic animal model of Alzheimer’s type. Streptozocin (STZ 3 mg/kg; bilaterally) was injected to male SD rats through intracerebroventricular (ICV) route. Drug treatment was started just after streptozocin administration and continued for 3 weeks. The rats were killed on the 21st day following the last behavioral test, and cytoplasmic fractions of the hippocampus and pre-frontal cortex were prepared for the quantification of acetylcholinesterase, oxidative stress parameter, mitochondrial enzymes activity and histological examination. Tramadol (5, 10 and 20 mg/kg, i.p.) was used as a treatment drug, and memantine (10 mg/kg, i.p.) was used as a standard. Tramadol significantly attenuated behavioral, biochemical, mitochondrial and histological alterations at low (5 mg/kg) and intermediate (10 mg/kg) dose, suggesting its neuroprotective potential in ICV-STZ-treated rats. Further, the neuroprotective effect of tramadol (10 mg/kg) was comparable to memantine (10 mg/kg). In conclusion, our results indicate the effectiveness of tramadol in preventing ICV-STZ-induced cognitive impairment as well as mito-oxidative stress. Further, these findings reveal the possibility of MOR agonist as a therapeutic approach for sporadic Alzheimer disease.
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Abbreviations
- AChE:
-
Acetylcholinesterase
- ANOVA:
-
Analysis of variance
- BBB:
-
Blood brain barrier
- BSA:
-
Bovine serum albumin
- CA-1:
-
Cornus Ammonis-1
- DTNB:
-
5,5′-Dithio-bis-[2-nitrobenzoic acid
- EGTA:
-
Ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid
- GABA-A:
-
Gamma-aminobutyric acid-A
- GSH:
-
Reduced glutathione
- HEPES:
-
4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid
- i.p.:
-
Intraperitoneal
- ICV-STZ:
-
Intracerebroventricular-streptozocin
- MORs:
-
Mu-opioid receptors
- MDA:
-
Malondialdehyde
- MTT:
-
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- NAD+:
-
Nicotinamide adenine dinucleotide
- NMDA:
-
N-Methyl-d-aspartate
- NO:
-
Nitric oxide
- NOS:
-
Nitric oxide synthase
- ROS:
-
Reactive oxygen species
- sAD:
-
Sporadic Alzheimer disease
- SDH:
-
Succinate dehydrogenase
- SOD:
-
Superoxide dismutase
- TBARS:
-
Thiobarbituric acid reactive substance
- TSTQ:
-
Time spent in target quadrant
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Authors would like to thank the financial support of Council of Scientific and Industrial Research (09/135/705/2014- EMR-I), New Delhi, India, for carrying out this work.
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Dhull, D.K., Kumar, A. Tramadol ameliorates behavioural, biochemical, mitochondrial and histological alterations in ICV-STZ-induced sporadic dementia of Alzheimer’s type in rats. Inflammopharmacol 26, 925–938 (2018). https://doi.org/10.1007/s10787-017-0431-3
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DOI: https://doi.org/10.1007/s10787-017-0431-3