Abstract

Background: The injuries of peripheral nervous system cause the death of a number of motor cells of the spinal cord. Neurotrophins family genes such as NT3 involve in neuronal survive after nerve injury and their expression changes after it. With due attention to the expansion of portulaca pleracea in the world study was conducted to determine the effects of alcoholic and aqueous extracts of Potulaca oleracea on the NT3 gene expression after sciatic nerve compression in rat.

Materials and Methods: This study was performed on 88 male wistar rats that randomly were divided in 13 groups of 6 each. They consisted of control group, 4 compression groups (The sciatic nerve was compressed with locker pincer) and 8 treatment groups: compression + treatment with dose of 75 mg/kg of alcoholic and aqueous extract of Portulaca oleracea on days 1 and 7 (never compression was done on the first day). In all groups, Total RNA was extracted from the lumbar spinal cord segment in 1, 7, 14, 28 days and cDNA was synthesized, then NT3 expression changes were compared in groups.

Results: There was a significant increase in NT3 gene expression in the compression group compared to control (p<0.001). The NT3 gene expression shows significant increase (p<0.05) in the treatment groups with alcoholic extract (except 1& 28 days). Also, there was no significant difference in gene expression between treatment group with acqueous extract and compression group in 1 and 7 days. A significant decrease was seen in the treatment groups with aqueous extract of purslane compared to compression (p<0.05). The NT3 gene expression shows significant increase in the treatment groups with alcoholic extract compared to treatment groups with aqueous extract in all days (p<0.05).

Conclusion: The results reveal the Portulaca oleracea leaves extracts increase the NT3 gene expression after sciatic nerve injury. This effect is more in alcoholic extract than aqueous extract.

Abstract

Background: Retrograde transport to the alpha motoneurons causes spinal degeneration. The neurotrophic factor (NT3) increases the number of myelinated axons in the dorsal root, leads to differentiation and survival of sensory neurons, parasympathetic motoneurons and prevents cell death. Lavender is a plant in the family Lamiaceae which is reported to have antioxidant, antispasmodic, diuretic, anti-asthmatic, refrigerant, and antipyretic effects. This study examined NT3 gene expression changes after sciatic nerve compression in rats, in the presence of Lavandula officinalis extract. 

Materials and Methods: Lavender Soxhlet hydroalcoholic extraction was prepared. 36 male Wistar rats were randomly divided into 3 groups including control, compression and treatment (compression group + hydroalcoholic extract of Lavender injections 75mg/kg) groups. In controls the muscle was opened without damage to gain access to the sciatic nerve. In compression and treatment groups, the sciatic nerve (right leg) was compressed. The extract was injected intraperitoneally in two occasions. A biopsy was taken from the spinal cord segments L4-L6 on day 28, total RNA was extracted and cDNA was synthesized and NT3 gene expression changes were analyzed by ANOVA test by using SPSS software. 

Results: The results showed that NT3 gene expression had a significant reduction in compression group compared to the control group (p<0.001) and it had a significant increase in treatment group compared with the compression group (p<0.001).

Conclusion: A significant increase in gene expression shows that Lavandula officinalis hydroalcoholic extract improves nerve regeneration via NT3 gene expression.