Protective Effects of Hexarelin and JMV2894 in a Human Neuroblastoma Cell Line Expressing the SOD1-G93A Mutated Protein.
This study investigated whether two growth hormone secretagogues (GHSs) — hexarelin and JMV2894 — could protect neural cells from oxidative stress in the context of amyotrophic lateral sclerosis (ALS). The researchers used human neuroblastoma cells (SH-SY5Y) engineered to express the SOD1-G93A mutant protein, a model relevant to familial ALS. Cells were exposed to hydrogen peroxide (H₂O₂) to simulate oxidative stress, with or without GHS co-treatment. The study found that both hexarelin and JMV2894 appeared to protect cells from H₂O₂-induced cytotoxicity by activating molecular pathways associated with the regulation of apoptosis and cell survival. The authors suggest these compounds may have antioxidant and neuroprotective properties worth exploring for ALS therapy. Key limitations include that this is a cell-based (in vitro) study only, using a cancer-derived cell line rather than primary motor neurons, and no animal or human data were generated. The authors themselves acknowledge the need for further work to clarify mechanisms and develop improved GHS candidates before any translational conclusions can be drawn.
Why this grade: All experiments were conducted exclusively in a human neuroblastoma cell line; no animal models or human subjects were involved, limiting translational conclusions.
Amyotrophic lateral sclerosis (ALS) is an incurable motor neuron disease whose etiology remains unresolved; nonetheless, mutations of superoxide dismutase 1 (SOD1) have been associated with several variants of ALS. Currently available pharmacologic interventions are only symptomatic and palliative in effect; therefore, there is a pressing demand for more effective drugs. This study examined potential therapeutic effects of growth hormone secretagogues (GHSs), a large family of synthetic compounds, as possible candidates for the treatment of ALS. Human neuroblastoma cells expressing the SOD1-G93A mutated protein (SH-SY5Y SOD1 G93A cells) were incubated for 24 h with H 2 O 2 (150 µM) in the absence, or presence, of GHS (1 µM), in order to study the protective effect of GHS against increased oxidative stress. The two GHSs examined in this study, hexarelin and JMV2894, protected cells from H 2 O 2 -induced cytotoxicity by activating molecules that regulate apoptosis and promote cell survival processes. These findings suggest the possibility of developing new GHS-based anti-oxidant and neuroprotective drugs with improved therapeutic potential. Further investigations are required for the following: (i) to clarify GHS molecular mechanisms of action, and (ii) to envisage the development of new GHSs that may be useful in ALS therapy.
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