Study summary · research use only
Intracellular adaptations of glutathione content in Cucurbita pepo L. induced by treatment with reduced glutathione and buthionine sulfoximine
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
In this plant study, the authors examined intracellular glutathione content in Cucurbita pepo L. seedlings after treatment with reduced glutathione (GSH) or buthionine sulfoximine (BSO), using immunogold labeling and transmission electron microscopy across cellular compartments. They report that GSH treatment increased glutathione in roots and leaves (up to 3.5-fold in nuclei) while BSO decreased it in all organs, and that mitochondria, showing the highest labeling, remained generally unaffected by both. BSO decreased glutathione substantially in plastids and cytosol of roots and cotyledons, with recovery after a short period. Prolonged GSH treatment for 24 h was associated with ultrastructural damage in all root organelles except mitochondria. The authors relate stable mitochondrial glutathione to cell survival.
Abstract
The intracellular effects of GSH (reduced glutathione) and BSO (buthionine sulfoximine) treatment on glutathione content were investigated with immunogold labeling in individual cellular compartments of Cucurbita pepo L. seedlings. Generally, GSH treatment led to increased levels of glutathione in roots and leaves (up to 3.5-fold in nuclei), whereas BSO treatment significantly decreased glutathione content in all organs. Transmission electron microscopy revealed that glutathione levels in mitochondria, which showed the highest glutathione labeling density of all compartments, remained generally unaffected by both treatments. Since glutathione within mitochondria is involved in the regulation of cell death, these results indicate that high and stable levels of glutathione in mitochondria play an important role in cell survival strategies. BSO treatment significantly decreased glutathione levels (1) in roots by about 78% in plastids and 60.8% in the cytosol and (2) in cotyledons by about 55% in the cytosol and 38.6% in plastids. After a short recovery period, glutathione levels were significantly increased in plastids and the cytosol of root tip cells (up to 3.7-fold) and back to control values in cotyledons. These results indicate that plastids, either alone or together with the cytosol, are the main center of glutathione synthesis in leaves as well as in roots. After GSH treatment for 24 h, severe ultrastructural damage related to increased levels of glutathione was found in roots, in all organelles except mitochondria. Possible negative effects of GSH treatment leading to the observed ultrastructural damage are discussed.
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