Mini Rev Med Chem. 2013 Jan;13(1):47-57.

Histamine H3 receptor function and ligands: recent developments.

Singh M, Jadhav HR.

Source

Department of Pharmacy, Birla Institute of Technology and Sciences Pilani, Pilani Campus, Vidya Vihar, Pilani, Rajasthan, India.

I hope this reference helps you.

Http://www.eurekaselect.com/105351/article

this is the link to see the article.

As I know, H3 is acting as Auto-receptor (located on Pre-synaptic nerve terminal) and mainly regulating its own (Histamine) synthesis as well as secretion.

For better understanding, refer the following link:

http://www.ncbi.nlm.nih.gov/pubmed/15465923