Apoptosis like PCD, autophagy, and necrosis; different types of cell death induced by cadmium in tobacco cells

الموضوعات :

Mohammad Pormehr ¹ , Faezeh Ghanati ² , Farzane Mohammadi ³ , Atefeh Payez ⁴ , Sepideh Mirzaei Rad ⁵

1 - Department of Plant Biology, Faculty of Biological Science, Tarbiat Modares University, Tehran-Iran
2 - Department of Plant Biology, Faculty of Biological Science, Tarbiat Modares University (TMU), Tehran, Iran
3 - Department of Plant Biology, Faculty of Biological Science, Tarbiat Modares University, Tehran- Iran
4 - Department of Biological Science, Farhangian University, Tehran, Iran
5 - 1 Department of Plant Biology, Faculty of Biological Science, Tarbiat Modares University, Tehran- Iran

تاريخ الإرسال : 28 الأحد , ذو الحجة, 1444 تاريخ التأكيد : 07 السبت , شعبان, 1445 تاريخ الإصدار : 21 الأحد , صفر, 1446

الکلمات المفتاحية: Apoptosis, Autophagy, Cadmium, Necrosis, Tobacco cells,

ملخص المقالة :

Cadmium (Cd) is an unessential and toxic element for plant cells exposure to which leads to death. Nonetheless the type(s) of death is far less well understood. In the present study suspension-cultured tobacco (Nicotiana tabacum cv. Barley21) cells were exposed to 5 to 150µM CdCl2 for 12h. The percentages of viability, apoptosis, necrosis, and the content of reactive oxygen species (ROS) were monitored by flow cytometry. Autophagy, as a pro-survival mechanism against Cd, was evaluated by autophagy inhibitor wortmannin. The antioxidants system and the expression of certain genes related to programmed cell death (PCD) were assessed by semi-quantitative RT-PCR. At 5μM Cd treatment, despite accumulation of 0.7mg/g Cd in the cells, no adverse effect was observed in viability, fresh and dry weight. At concentrations above 5µM, increase of internal Cd level provoked antioxidant system and initiated different types of cell death. At concentration of 50µM, Cd mostly induced PCD. In 100µM and 150µM Cd treatments however, autophagy and necrosis were respectively the most prominent types of cell death. The expression pattern of Hsr203J and ATG9 at different Cd concentrations was coincident with the pronounced death type of each treatment. The results suggested that the intensity of Cd toxicity for tobacco cells is basically depends on the level of its internal concentration and the type of death is related to the outcome of the activity of antioxidant system.

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