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. 1995 Mar 28;92(7):2720–2724. doi: 10.1073/pnas.92.7.2720

P-Lim, a LIM homeodomain factor, is expressed during pituitary organ and cell commitment and synergizes with Pit-1.

I Bach 1, S J Rhodes 1, R V Pearse 2nd 1, T Heinzel 1, B Gloss 1, K M Scully 1, P E Sawchenko 1, M G Rosenfeld 1
PMCID: PMC42290  PMID: 7708713

Abstract

A pituitary LIM homeodomain factor, P-Lim, is expressed as Rathke's pouch forms and as specific pituitary cell phenotypes are established, suggesting functional roles throughout pituitary development. While selectively expressed in both anterior and intermediate pituitary in mature mice, P-Lim is also transiently expressed in the developing ventral neural cord and brainstem. P-Lim binds to and activates the promoter of the alpha-glycoprotein subunit gene, a marker of early pituitary development, and synergizes with Pit-1 in transcriptional activation of genes encoding terminal differentiation markers. The LIM domain of P-Lim specifically interacts with the Pit-1 POU domain and is required for synergistic interactions with Pit-1, but not for basal transcriptional activation events.

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