Abstract
Cellular immunity including MHC-unrestricted natural killer (NK) cells and antigen-specific, class I MHC-restricted cytotoxic T lymphocytes (CTLs) plays a central role in monitoring viral infections and tumor growth (1). NK activity has been shown to be modified by opioid compounds both in vitro and in vivo. The addition of endogenous opioid peptides (e.g., β-endorphin or [met]-enkephalin) to 4-hr 51Cr-release NK microcytotoxicity assays has been shown to augment NK activity; this augmentation is naloxone-sensitive (2). However, the acute administration of opioid drugs (e.g., morphine or fentanyl) in mice has been shown to suppress splenic NK activity through a naltrexone-sensitive mechanism (3-5). This suppression involves opioid receptors located in the periaqueductal gray matter of the mesencephalon (6). Pretreatment of the mice with the α-adrenoceptor antagonists phentolamine or prazocin blocks morphine-mediated suppression of splenic NK activity implicating α-adrenergic receptor involvement (7). Preadministration of mice with phentolamine (general α-adrenoceptor antagonist) but not doxazosin (peripheral-acting α-adrenergic receptor antagonist) inhibits morphine-mediated suppression of splenic NK activity further implicating central (brain) rather than peripheral α-adrenergic involvement (8). Alternatively, other neuroendocrine hormones may be utilized distal to the brain ultimately influencing NK effector cells. Specifically, splenic serotonin levels are elevated following acute morphine administration and such increases can be blocked by pretreating animals with phentolamine (8). These results suggest serotonin might be solicited by adrenergic processes ultimately resulting in suppression of splenic NK activity. Consistent with this notion, a recent study revealed serotonin suppressed NK activity in whole blood and such effects could be reversed with interferon-α (9). Certainly, this is a complicated issue involving many mediators which may have direct or indirect effects on the NK cells.
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Carr, D.J.J., Carpenter, G.W., Garza, H.H., Baker, M.L., Gebhardt, B.M. (1995). Cellular Mechanisms Involved in Morphine-Mediated Suppression of CTL Activity. In: Sharp, B.M., Eisenstein, T.K., Madden, J.J., Friedman, H. (eds) The Brain Immune Axis and Substance Abuse. Advances in Experimental Medicine and Biology, vol 373. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1951-5_18
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DOI: https://doi.org/10.1007/978-1-4615-1951-5_18
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