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Protection of apoptotic cell death by protein A

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Abstract

The word “Apoptosis” or pragrammed cell death is described as the ultimate end of multiple cellular events converging from numerous initiating events to the ultimate death of a cell or organism. Several processes, such as initiation of death signals at the plasma membrane, expression of pro-apoptotic oncoproteins, activation of death proteases, endonucleases etc., that ultimately coalesce to a common irreversible execution phase, lead to cell demise. Counteracting the death signals are cell survival factors. A balance between the cell death and cell survival factors plays a major role in the decision making process as to whether a cell should die or must live. It is, therefore, hypothesized that if the balance can be shifted in favor of cell survival, one might be able to arrest the aging process, save the injured cells or else if the balance is shifted toward cell-kill it might help destroy tumors and other undesirable cells.

Protein A (PA) of Staphylococcus aureus has been found to have multifarious biological response modifying properties. It has been shown to possess anti-tumor, anti-toxic, anti-parasitic and antifungal activities. It also acts as a potent immunostimulator. PA can protect bone marrow progenitor cells from zidovudin(AZT)-induced apoptosis and can stimulate immunocyte proliferation, thereby helping to replenish/restore the depleted hematopoietic cell pool. Such ability to replenish hematopoietic cells is a common property of PA observed against a number of toxic drugs/chemicals, such as cyclophosphamide, benzene, aflatoxin, salmonella endotoxin, etc.

Interestingly, it was further demonstrated in our laboratory that PA can selectively kill tumor cells without affecting normal cells of the host. A search for the mechanisms of PA action revealed that this bacterial protein could shift the balance between pro- and anti-apoptotic proteins in favor of survival in normal cells, but in favor of cell death in tumor cells at a particular dose level. This unique property of PA suggests that controlled use of such type of Biological Response Modifier might help in controlling both cell growth and death phenomena.

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Authors and Affiliations

  1. Chanin Institute for Cancer Research, Tumor Vaccine Program, Albert Einstein College of Medicine, Bronx, NY, 10461, USA

    Prasanta K. Ray

  2. Animal Physiology Section, USA

    Tanya Das & Gaurisankar Sa

  3. Immunotechnology Section, Bose Institute, P-1/12 CIT Scheme VII M, Calcutta, 700 054, India

    Amiya K. Ghosh & Sreya Chattopadhyay

Authors
  1. Prasanta K. Ray
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  2. Tanya Das
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  3. Gaurisankar Sa
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  4. Amiya K. Ghosh
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  5. Sreya Chattopadhyay
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Ray, P.K., Das, T., Sa, G. et al. Protection of apoptotic cell death by protein A. Apoptosis 5, 509–514 (2000). https://doi.org/10.1023/A:1009633412009

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