N aney J. Rothwell ytokine neurobiology is now a hot topic! Only a few
years ago C most neuroscientists were only dimly aware of cytokines and
knew little about their function or biological importance. Cytokines,
now a huge collection of polypeptides with diverse activities, were
until quite recently, studied by those interested in the immune system,
inflamma- tion, cancer or infection in peripheral tissues, and did not
feature in neuroscience. For example, less than five years ago virtually
no refer- ence was made to cytokines in any of the numerous abstracts at
the American Society for Neuroscience annual meeting. This situation has
now changed dramatically. In an article in early 1995 (Hopkins and
Rothwell), we reported an exponential increase in articles on cytokines
and the nervous system within the previous year and it seems that this
publication frenzy is continuing. There are sev- eral reasons for such
interest in cytokines and the nervous system. Firstly, the field of
neuroimmunology (or psychoneuroimmunologyl psychoneuroendocrinology) has
developed considerably in the past five years. Thus the importance of
interactions between the nervous, im- mune and endocrine systems in
responses to disease, injury and stress is now recognized. These
bidirectional communications have been mirrored by active dialogue (and
even collaboration) between neuro- scientists and immunologists.
Cytokines form a critical part of neuroimmune interactions.