HeLa cells have histamine H1-receptors which mediate activation of the K^+ conductance - Hazama, A.; Yada, T.; Okada, Y. (Elsevier)
HeLa cells responded to exogenous histamine with a transient hyperpolarization due to increased membrane conductance to K^+. After successive applications of histamine, the cell membrane became virtually unresponsive (desensitized). The responses were blocked by pyrilamine but not by cimetidine. Thus, it appears that HeLa cells have H1-receptors which mediate an increase in the K^+ conductance.
http://linkinghub.elsevier.com/retrieve/pii/0167-4889(85)90183-1
Keywords: W; V; WW-YZ; U