In previous experiments we have shown the role of nitric oxide (NO) in
basal and interleukin-1 beta (IL-1 beta)-induced CRH and ACTH release
in vitro. Now, we have studied the possible production of NO from hyp
othalamic cell cultures, particularly after IL-1 beta stimulation or L
-NOArg inhibition, by high performance liquid chromatographic (HPLC) a
ssay of L-citrulline production, adding further evidence for a role of
NO in IL-1 beta activity in the hypothalamus.