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. 2007 Jul 27;32(6):363–378. doi: 10.1111/j.1365-2184.1999.tb01354.x

Spontaneous apoptosis and expression of cell surface heat‐shock proteins in cultured EL‐4 lymphoma cells

A M Sapozhnikov 1,✉, E D Ponomarev 1, T N Tarasenko 1, W G Telford 2
PMCID: PMC6495567  PMID: 10646688

Abstract

Abstract. The expression of heat‐shock proteins (HSPs) is enhanced in stressed cells and can protect cells from stress‐induced injury. However, existing data about the relationship between apoptosis and HSP expression is contradictory. In this paper, a mouse lymphoma cell death model system is used to detect simultaneously both the process of apoptosis and the level of HSP expression. The model was established after discovering that spontaneous apoptosis and spontaneous cell surface HSP expression occurs in EL‐4 mouse lymphoma cells during normal optimal culture conditions. The data show that apoptotic EL‐4 cells had higher levels of hsp25, hsp60, hsp70 and hsp90 exposed on the plasma membrane surface than viable cells. The level of surface HSPs was found to increase through several stages of early and late apoptotic death as measured by flow cytometry, with the highest levels observed during the loss of cell membrane phospholipid asymmetry. Heat shock and actinomycin D significantly increased the proportion of apoptotic cells in culture. However, hyperthermia only stimulated a weak and temporary increase in surface HSP expression, whereas actinomycin D strongly elevated the level of surface and intracellular HSPs, particularly in live cells. These results show an associative relationship between apoptosis and HSP expression. The relationship between the progression of cell death and HSP expression suggests a role for membrane HSP expression in programmed cell death.

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