The pathophysiology of diabetic neuropathic pain is due to primarily metabolic and vascular factors. There is an increase in sorbitol and fructose, glycated end products, reactive oxygen species and activation of prot...The pathophysiology of diabetic neuropathic pain is due to primarily metabolic and vascular factors. There is an increase in sorbitol and fructose, glycated end products, reactive oxygen species and activation of protein kinase C in the diabetic state. All these factors lead to direct damage to the nerves. Taking effective clinical management of neuropathic pain is based on a pharmacological treatment that has shown their limits and many side effects. The hypothesis of central sensitization inhibited by Clerodendrum formicarum, an African pharmacopoeia plant used to treat headaches, arthritis, epilepsy and chronic pain could act on astrocytes and microglial cells. The objective of this work is to study the effect of Clerodendrum formicarum (100, 150 and 200 mg/kg body weight) on astrocytes and microglial cells in a model of diabetic neuropathic pain induced by alloxan monohydrate (150 mg/kg). We noted a suppression of mechanical allodynia and mechanical hyperalgesia respectively by the Von Frey filaments test and the pressure test on the paw by the Clerodendrum formicarumextracts (ECF) at different doses from 2 h at the first injection of the ECF. After 5 days of treatment, we expressed by Western Blot bands of different proteins and by quantitative RT-PCR, we determined inhibition of the expression of GFAP, CD11b and isoforms 1 and 2 of cyclooxygenase. These results suggest that ECF inhibits the activation of astrocytes, microglial cells and cyclooxygenase signaling pathway.展开更多
Objective: To investigate protective effects of Hydnophytum formicarum Jack.(H. formicarum) extracts via regulation of SIRT1-FOXO3a-ADAM10 signaling and antioxidant activity against H_2O_2-induced neurotoxicity in neu...Objective: To investigate protective effects of Hydnophytum formicarum Jack.(H. formicarum) extracts via regulation of SIRT1-FOXO3a-ADAM10 signaling and antioxidant activity against H_2O_2-induced neurotoxicity in neuroblastoma SH-SY5Y cells. Methods: Cell viability and apoptosis of neuronal cells pretreated with H. formicarum Jack. extracts under oxidative stress were determined by MTT assay and flow cytometry. The intracellular reactive oxygen species(ROS) was performed using Carboxy-DCFDA assay. Additionally, a profile of protein expressions related to neuroprotection was detected by western blot analysis. Results: The plant extracts(methanol and ethyl acetate) elicited protective effects on the neuronal cell death as performed by the MTT assay and by apoptosis analysis via the activation of BCL-2. Both ethyl acetate and methanol extracts exerted inhibitory effects against H_2O_2-induced ROS generation in the SH-SY5Y cells. Furthermore, the possible mechanism of neuroprotection of H. formicarum Jack. was observed through its antioxidant properties by maintaining the levels of catalase and SOD2 proteins as well as activating SIRT1-FOXO3a pathway. Importantly, pretreatment of neuronal cells with H. formicarum Jack. significantly recovered the levels of ADAM10 protein compared with the H_2O_2 treatment alone. Conclusions: The recent findings suggest the protective effects of H. formicarum Jack. plant extracts on attenuating H_2O_2-induced neurotoxicity in human SH-SY5Y cells.展开更多
文摘The pathophysiology of diabetic neuropathic pain is due to primarily metabolic and vascular factors. There is an increase in sorbitol and fructose, glycated end products, reactive oxygen species and activation of protein kinase C in the diabetic state. All these factors lead to direct damage to the nerves. Taking effective clinical management of neuropathic pain is based on a pharmacological treatment that has shown their limits and many side effects. The hypothesis of central sensitization inhibited by Clerodendrum formicarum, an African pharmacopoeia plant used to treat headaches, arthritis, epilepsy and chronic pain could act on astrocytes and microglial cells. The objective of this work is to study the effect of Clerodendrum formicarum (100, 150 and 200 mg/kg body weight) on astrocytes and microglial cells in a model of diabetic neuropathic pain induced by alloxan monohydrate (150 mg/kg). We noted a suppression of mechanical allodynia and mechanical hyperalgesia respectively by the Von Frey filaments test and the pressure test on the paw by the Clerodendrum formicarumextracts (ECF) at different doses from 2 h at the first injection of the ECF. After 5 days of treatment, we expressed by Western Blot bands of different proteins and by quantitative RT-PCR, we determined inhibition of the expression of GFAP, CD11b and isoforms 1 and 2 of cyclooxygenase. These results suggest that ECF inhibits the activation of astrocytes, microglial cells and cyclooxygenase signaling pathway.
文摘Objective: To investigate protective effects of Hydnophytum formicarum Jack.(H. formicarum) extracts via regulation of SIRT1-FOXO3a-ADAM10 signaling and antioxidant activity against H_2O_2-induced neurotoxicity in neuroblastoma SH-SY5Y cells. Methods: Cell viability and apoptosis of neuronal cells pretreated with H. formicarum Jack. extracts under oxidative stress were determined by MTT assay and flow cytometry. The intracellular reactive oxygen species(ROS) was performed using Carboxy-DCFDA assay. Additionally, a profile of protein expressions related to neuroprotection was detected by western blot analysis. Results: The plant extracts(methanol and ethyl acetate) elicited protective effects on the neuronal cell death as performed by the MTT assay and by apoptosis analysis via the activation of BCL-2. Both ethyl acetate and methanol extracts exerted inhibitory effects against H_2O_2-induced ROS generation in the SH-SY5Y cells. Furthermore, the possible mechanism of neuroprotection of H. formicarum Jack. was observed through its antioxidant properties by maintaining the levels of catalase and SOD2 proteins as well as activating SIRT1-FOXO3a pathway. Importantly, pretreatment of neuronal cells with H. formicarum Jack. significantly recovered the levels of ADAM10 protein compared with the H_2O_2 treatment alone. Conclusions: The recent findings suggest the protective effects of H. formicarum Jack. plant extracts on attenuating H_2O_2-induced neurotoxicity in human SH-SY5Y cells.
