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Division of Endocrinology Department of Internal Medicine (A.C.A., S.J., P.C.F., M.A.S.) Department of Molecular Physiology and Biological Physics (J.W., M.A.S.), and The National Science Foundation Center for Biological Timing University of Virginia Charlottesville, Virginia 22903
GnRH pulses regulate gonadotropin subunit gene
transcription in a frequency-dependent, subunit-specific manner. The
-subunit gene is stimulated by constant GnRH and by rapid to
intermediate pulse frequencies, while stimulation of LHß subunit gene
transcription requires intermediate frequency pulses. We have defined
the GnRH-responsive elements of the rat LH subunit gene promoters by
deletion/mutation analysis and transfection studies in rat pituitary
cells and two clonal gonadotrope cell lines. The
-subunit gene
GnRH-responsive region lies between -411 and -375 bp. The region
contains two Ets-domain protein binding sites, and mutating either site
obliterates the response. DNA protein binding studies demonstrate the
two sites are not equivalent, and that Ets-1 does not mediate this
response. Studies of the LHß promoter reveal a major GnRH-responsive
region between -456 and -342 bp. Within this region, two Sp1
binding sites contribute to the GnRH response, and the 3'Sp1
site is also critical for basal expression. The 5'Sp1 site partially
overlaps a CArG box, and mutating the CArG element specifically
eliminates the response to pulsatile GnRH. DNA containing this
mutation cannot form intermediate mobility complexes with nuclear
proteins, but retains Sp1 binding. Mutation of the 3'Sp1 site and
either the 5'Sp1 or CArG element partially restores GnRH stimulation,
suggesting a downstream element contributes to the full GnRH response.
These studies demonstrate that unique composite elements and
transcription factors are responsible for GnRH stimulation of the LH
subunit genes and may contribute to their differential responses to
GnRH pulses.
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