PMID- 16001330 OWN - NLM STAT- MEDLINE DCOM- 20050929 LR - 20090219 IS - 0018-5043 (Print) IS - 0018-5043 (Linking) VI - 37 IP - 6 DP - 2005 Jun TI - Menin and TGF-beta superfamily member signaling via the Smad pathway in pituitary, parathyroid and osteoblast. PG - 375-9 AB - PITUITARY: Menin is a Smad3-interacting protein; inactivation of menin blocks transforming growth factor (TGF)-beta and activin signaling, antagonizing their growth-inhibitory properties in anterior pituitary cells. Menin is also required for the activin-induced inhibition of prolactin expression mediated by the Smads and the transcription factor, Pit-1. The interaction between menin and Smad3 is direct. PARATHYROID: In cultured parathyroid cells from uremic hemodialysis patients, in which the menin signaling pathways are probably still intact, menin inactivation achieved by menin antisense oligonucleotides leads to loss of TGF-beta inhibition of parathyroid cell proliferation and parathyroid hormone (PTH) secretion. Moreover, TGF-beta does not affect the proliferation and PTH production of parathyroid cells from multiple endocrine neoplasia type 1 (MEN1) patients. OSTEOBLAST: Men1-null mouse fetuses that die at day 12 or earlier have cranial/facial hypoplasias implicating menin in bone development. Menin is required for the commitment of multipotential mesenchymal stem cells into the osteoblast lineage. This is achieved by menin interacting physically and functionally with bone morphogenetic protein (BMP)-2 regulated Smads, such as Smad1 and Smad5, and the key osteoblast regulator, Runx2. These interactions are lost as the committed osteoblasts differentiate further at which time menin interacts with Smad3, mediating the negative regulation of Runx2 by TGF-beta. Menin also suppresses osteoblast maturation, partly by inhibiting the differentiation actions of JunD. FAU - Hendy, G N AU - Hendy GN AD - Department of Medicine, Physiology and Human Genetics, McGill University, and Calcium Research Laboratory and Hormones and Cancer Research Unit, Royal Victoria Hospital, 687 Pine Avenue West, Montreal, Quebec, Canada H3A 1A1. geoffrey.hendy@mcgill.ca FAU - Kaji, H AU - Kaji H FAU - Sowa, H AU - Sowa H FAU - Lebrun, J-J AU - Lebrun JJ FAU - Canaff, L AU - Canaff L LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review PL - Germany TA - Horm Metab Res JT - Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme JID - 0177722 RN - 0 (DNA-Binding Proteins) RN - 0 (Men1 protein, mouse) RN - 0 (Proto-Oncogene Proteins) RN - 0 (SMAD1 protein, human) RN - 0 (Smad Proteins) RN - 0 (Smad1 Protein) RN - 0 (Smad1 protein, mouse) RN - 0 (Trans-Activators) RN - 0 (Transforming Growth Factor beta) SB - IM MH - Animals MH - Cell Differentiation/genetics MH - Cells, Cultured MH - DNA-Binding Proteins/*metabolism MH - Humans MH - Mice MH - Mice, Mutant Strains MH - Multiple Endocrine Neoplasia Type 1/genetics/metabolism MH - Osteoblasts/*metabolism MH - Pituitary Gland/*metabolism MH - Proto-Oncogene Proteins/genetics MH - *Signal Transduction MH - Smad Proteins MH - Smad1 Protein MH - Thyroid Gland/cytology/*metabolism MH - Trans-Activators/*metabolism MH - Transforming Growth Factor beta/*metabolism RF - 49 EDAT- 2005/07/08 09:00 MHDA- 2005/09/30 09:00 CRDT- 2005/07/08 09:00 PHST- 2005/07/08 09:00 [pubmed] PHST- 2005/09/30 09:00 [medline] PHST- 2005/07/08 09:00 [entrez] AID - 10.1055/s-2005-870152 [doi] PST - ppublish SO - Horm Metab Res. 2005 Jun;37(6):375-9. doi: 10.1055/s-2005-870152.