VIP and PACAP receptors coupled to adenylyl cyclase in human lung cancer: a study in biopsy specimens.

Abstract

Vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP) are important neuropeptides in the control of lung physiology. Both of these commonly bind to specific G protein coupled receptors named VPAC(1)-R and VPAC(2)-R, and PAC(1)-R (with higher affinity for PACAP). VIP and PACAP have been implicated in the control of cell proliferation and tumor growth. This study examined the presence of VIP and PACAP receptors in human lung cancer samples, as well as the functionality of adenylyl cyclase (AC) stimulated by both peptides. Results from RT-PCR and immunoblot experiments showed the expression of VPAC(1)-, VPAC(2)- and PAC(1)-R in lung cancer samples. Immunohistochemical studies showed the expression of VPAC(1) and VPAC(2) receptors. These receptors were positively coupled to AC, but the enzyme activity was impaired as compared to normal lung. There were no changes in Galpha(s) or Galpha(i) levels. Present results contribute to a better knowledge of VIP/PACAP actions in lung cancer and support the interest for the development of VIP/PACAP analogues with therapeutic roles.

• Authors: Rebeca Busto, Juan C Prieto, Guillermo Bodega, José Zapatero, Luis Fogué, Isabel Carrero
• Journal: Peptides (Peptides) Vol. 24 Issue 3 Pg. 429-36 (Mar 2003) ISSN: 0196-9781 [Print] United States
• PMID: 12732341 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• ADCYAP1R1 protein, human
• RNA, Messenger
• Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide
• Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I
• Receptors, Pituitary Hormone
• Receptors, Vasoactive Intestinal Peptide
• Adenylyl Cyclases

Topics

• Adenylyl Cyclases (metabolism)
• Aged
• Biopsy
• Blotting, Western
• Gene Expression Regulation, Neoplastic
• Humans
• Immunohistochemistry
• Lung Neoplasms (enzymology, genetics, metabolism)
• Middle Aged
• RNA, Messenger (genetics, metabolism)
• Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide
• Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I
• Receptors, Pituitary Hormone (genetics, metabolism)
• Receptors, Vasoactive Intestinal Peptide (genetics, metabolism)