Cholangiocytes are the target cells in cholestatic liver diseases such as primary biliary cirrhosis (PBC) and primary sclerosing cholangitis (PSC), which are characterized by the damage and proliferation of these cells. Cholangiocyte proliferation is critical for the maintenance of the biliary mass and secretory function during the pathogenesis of these devastating liver diseases. Proliferating cholangiocytes serve as a neuroendocrine compartment during the progression of liver diseases, and as such secrete a number of growth factors, and respond to hormones, neurotransmitters and neuropeptides contributing to the autocrine and paracrine pathways that modulate liver inflammation and fibrosis. The overall objective of this proposal is to determine the molecular mechanisms by which local (from cholangiocytes), paracrine (by administration of melatonin or anti-melatonin antibody) and central (from pineal gland) melatonin synthesis (regulated by the enzyme AANAT expressed in the liver mainly by cholangiocytes) participates in the homeostasis of the biliary mass during cholestasis and liver damage. We proposed the central hypothesis that local melatonin synthesis in cholangiocytes as well as central secretion of melatonin from the pineal gland (pineal gland/biliary axis) coordinately regulates biliary proliferation/damage during cholestasis. To test the central hypothesis, we have proposed two specific aims: (1) Evaluate the effects of the modulation of melatonin synthesis by pineal gland during cholestasis on cholangiocyte proliferation;and (2) Define the role of local melatonin synthesis in the regulation of the proliferation/damage of cholangiocytes to cholestasis. At the completion of this project, we expect to have determined the extent to which proliferation of cholangiocytes is regulated by central and local melatonin synthesis, and to have identified key signaling pathways by which melatonin regulates biliary proliferation/damage. The information gained from the successful completion of these studies are expected to provide important insights into the intracellular mechanisms regulating cholangiocyte proliferation, which will ultimately help in the identification of specific factors and pathways that can be targeted for the development of therapeutic interventions. Finally, results of these studies may impact the development of improved therapeutic strategies (targeting AANAT) for the treatment of chronic cholestatic liver diseases.

Public Health Relevance

The health relatedness of this grant proposal is that effective treatments are lacking for chronic cholestatic liver diseases, such as primary biliary cirrhosis (PBC) and primary sclerosing cholangitis (PSC). Chronic cholestatic liver diseases (cholangiopathies) cause proliferation/damage of bile ducts inside the liver. The rationale for our research is that the successful completion of the studies can ultimately be expected to provide a greater understanding of the progressive mechanisms of cholestatic liver diseases, and increase opportunities for the development of novel treatment paradigms for the management of chronic liver diseases.

National Institute of Health (NIH)
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Research Project (R01)
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Hepatobiliary Pathophysiology Study Section (HBPP)
Program Officer
Sherker, Averell H
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Texas A&M University
Internal Medicine/Medicine
Schools of Medicine
College Station
United States
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Glaser, Shannon; Han, Yuyan; Francis, Heather et al. (2014) Melatonin regulation of biliary functions. Hepatobiliary Surg Nutr 3:35-43
Martínez, Allyson K; Maroni, Luca; Marzioni, Marco et al. (2014) Mouse models of liver fibrosis mimic human liver fibrosis of different etiologies. Curr Pathobiol Rep 2:143-153
Glaser, Shannon; Meng, Fanyin; Han, Yuyan et al. (2014) Secretin stimulates biliary cell proliferation by regulating expression of microRNA 125b and microRNA let7a in mice. Gastroenterology 146:1795-808.e12
Renzi, Anastasia; Mancinelli, Romina; Onori, Paolo et al. (2014) Inhibition of the liver expression of arylalkylamine N-acetyltransferase increases the expression of angiogenic factors in cholangiocytes. Hepatobiliary Surg Nutr 3:4-10
Han, Yuyan; Glaser, Shannon; Meng, Fanyin et al. (2013) Recent advances in the morphological and functional heterogeneity of the biliary epithelium. Exp Biol Med (Maywood) 238:549-65
Onori, Paolo; Mancinelli, Romina; Franchitto, Antonio et al. (2013) Role of follicle-stimulating hormone on biliary cyst growth in autosomal dominant polycystic kidney disease. Liver Int 33:914-25
Mancinelli, Romina; Franchitto, Antonio; Glaser, Shannon et al. (2013) GABA induces the differentiation of small into large cholangiocytes by activation of Ca(2+) /CaMK I-dependent adenylyl cyclase 8. Hepatology 58:251-63
Glenister, Rachael; McDaniel, Kelly; Francis, Heather et al. (2013) Therapeutic actions of melatonin on gastrointestinal cancer development and progression. Transl Gastrointest Cancer 2:
Renzi, Anastasia; DeMorrow, Sharon; Onori, Paolo et al. (2013) Modulation of the biliary expression of arylalkylamine N-acetyltransferase alters the autocrine proliferative responses of cholangiocytes in rats. Hepatology 57:1130-41
Jensen, Kendal Jay; Alpini, Gianfranco; Glaser, Shannon (2013) Hepatic nervous system and neurobiology of the liver. Compr Physiol 3:655-65

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