Previous Article | Next Article ![]()
Mol. Cell. Biol., 08 1995, 4064-4075, Vol 15, No. 8
JE Henderson, N Amizuka, H Warshawsky, D Biasotto, BM Lanske, D Goltzman and AC Karaplis
Parathyroid hormone-related peptide (PTHrP) is a mediator of cellular
growth and differentiation as well as a cause of malignancy-induced
hypercalcemia. Most of the actions of PTHrP have been attributed to its
interaction with a specific cell surface receptor that binds the N-
terminal domain of the protein. Here we present evidence that PTHrP
promotes some of its cellular effects by translocating to the nucleolus.
Localization of transiently expressed PTHrP to the nucleolus was dependent
on the presence of a highly basic region at the carboxyl terminus of the
molecule that bears homology to nucleolar targeting sequences identified
within human retroviral (human immunodeficiency virus type 1 and human
T-cell leukemia virus type 1) regulatory proteins. Endogenous PTHrP also
localized to the nucleolus in osseous cells in vitro and in vivo. Moreover,
expression of PTHrP in chondrocytic cells (CFK2) delayed apoptosis induced
by serum deprivation, and this effect depended on the presence of an intact
nucleolar targeting signal. The present findings demonstrate a unique
intracellular mode of PTHrP action and a novel mechanism by which this
peptide growth factor may modulate programmed cell death.
Copyright © 1995, American Society for Microbiology
Nucleolar localization of parathyroid hormone-related peptide enhances survival of chondrocytes under conditions that promote apoptotic cell death
Division of Endocrinology, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Quebec, Canada.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»