It is less than 80 years since John Newport Langley first proposed the
role of "receptive substances" as the site of drug action from his
obser- vations on the effects of nicotine and curare at the myoneural
junction. The many advances in our understanding of receptor biology
that have occurred during the intervening period mirror the
extraordinary growth of knowledge in the biological sciences and in cell
and molecular biology in particular. Receptor biology, in common with
many other topics in contemporary biology, is on the threshold of a
transition from being a descriptive, phenomenological discipline to one
in which underlying mechanisms and regulatory principles can be defined
with increasing pre- cision. This change, together with the evolution of
powerful analytical techniques and timely convergence of ideas from a
number of previously separate fields of inquiry, is generating an
increasingly unified theoretical and experimental framework for the
study of receptor function. These themes, and the mood of anticipation
that a real understanding of receptor function in health and disease is
emerging, are reflected in in this volume, which summarizes the
proceedings of the Sec- the papers ond Smith Kline & French Research
Symposium on New Horizons in Therapeutics held in Philadelphia in 1984.