Abstract:
:Epinephrine and Norepinephrine, typically released during stress bind to nine different adrenoceptors (AR) which classically control the cardiovascular and respiratory systems. New targets were described for the many agonists and antagonists developed for these AR, as the central nervous system. During the last three decades, AR expression and action on the mammary gland/breast were extensively investigated. In the cow mammary gland, good milkability was associated with low density of beta(2)-AR and high density of alpha(2)-AR. In the rat normal mammary gland, beta-AR are expressed in the epithelial cells, alveoli, ducts, and adipocytes showing an exquisite regulation by steroid hormones and prolactin. In rat dimethylbenz(a)anthracene (DMBA) tumors, a close correlation was observed between tumor growth and beta-AR concentration. beta(2)-AR were described in numerous human cell lines and breast tumors. The action of beta-adrenergic compounds on cell proliferation is contradictory. While some authors found that beta-agonists significantly inhibit cancer cell proliferation and tumor growth in mice, others described a significant reduction in DNA synthesis by beta-blockers. Also, positive effects of beta-AR on human carcinoma cell migration have been described. alpha(2)-AR are expressed in human breast cancer and non-cancer cell lines, their stimulation being associated with increased cell proliferation. In vivo clonidine increased tumor growth and alpha (2)-adrenergic antagonists completely reversed this effect. When administered alone, rauwolscine inhibited tumor growth behaving as an inverse agonist. Therefore, the numerous adrenergic beta- and alpha-AR agonists or antagonists could prove to be unexpected therapeutic options for mammary gland/ breast and mainly breast cancer.
journal_name
Curr Med Chemjournal_title
Current medicinal chemistryauthors
Lüthy IA,Bruzzone A,Piñero CP,Castillo LF,Chiesa IJ,Vázquez SM,Sarappa MGdoi
10.2174/092986709788186048subject
Has Abstractpub_date
2009-01-01 00:00:00pages
1850-62issue
15eissn
0929-8673issn
1875-533Xjournal_volume
16pub_type
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