During development, the fetus is exposed to prolactin activity from the placenta, as well as from the developing fetal pituitary. Distinct prolactin receptor isoforms, having different cytoplasmic domains generated by alternative splicing, are expressed as development proceeds at different levels in different organs. The ‘long’ receptors are able to mediate transduction of all signals examined, in contrast with the ‘short’ isoforms, whose truncated cytoplasmic domains are able to mediate a much smaller repertoire of signals and can act as dominant negatives. Our studies demonstrate that, although these forms share internalization mechanisms, the long form is internalized faster, resulting in more rapid down-regulation of this form. In order to examine the mechanisms by which prolactin may exert trophic effects on its target tissues during development, we have examined the signalling pathways through which prolactin binding to the long receptor regulates the transcription of cyclin D1. Our studies reveal the importance of the JAK/STAT (Janus kinase/signal transduction and activators of transcription) pathway, and the complexity of prolactin signalling to this promoter.
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Conference Article|
May 01 2001
Prolactin receptor heterogeneity: processing and signalling of the long and short isoforms during development
L. A. Schuler;
L. A. Schuler
1
*Department of Comparative Biosciences, University of Wisconsin, Madison, WI 53706, U.S.A.
1To whom correspondence should be addressed (e-mail schulerl@svm.vetmed.wisc.edu)
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J.-C. Lu;
J.-C. Lu
*Department of Comparative Biosciences, University of Wisconsin, Madison, WI 53706, U.S.A.
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J. L. Brockman
J. L. Brockman
*Department of Comparative Biosciences, University of Wisconsin, Madison, WI 53706, U.S.A.
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Publisher: Portland Press Ltd
Received:
November 20 2000
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© 2001 Biochemical Society
2001
Biochem Soc Trans (2001) 29 (2): 52–56.
Article history
Received:
November 20 2000
Citation
L. A. Schuler, J.-C. Lu, J. L. Brockman; Prolactin receptor heterogeneity: processing and signalling of the long and short isoforms during development. Biochem Soc Trans 1 May 2001; 29 (2): 52–56. doi: https://doi.org/10.1042/bst0290052
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