Abstract:
:In this study, parathyroid hormone (PTH) receptor binding was examined in the membrane fraction of the endometrium of the shell gland of laying and nonlaying hens by the use of (125)I-PTH-related peptide (PTHrP) binding assays. Specific (125)I-PTHrP binding was found in the endometrium of the shell gland and increased during the first 1 h of incubation and then reached a plateau. Specific (125)I-PTHrP binding increased in line with an increase in protein concentration from 10 to 80 microg. The membrane fraction had specific binding to (125)I-PTHrP. The Scatchard plot analysis revealed a linear profile that indicated the presence of one type of receptor. The equilibrium dissociation constant (K(d)) and the maximum binding capacity (B(max)) in the shell gland decreased 19 h before oviposition in egg-laying hens and remained low for about 20 h during the period of calcification. In contrast, the K(d) and the B(max) in nonlaying hens were constant throughout a 24-h period. These results suggest that PTH acts on the endometrium of the shell gland during the eggshell calcification.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Ieda T,Takahashi T,Saito N,Yasuoka T,Kawashima M,Shimada Kdoi
10.1006/gcen.1999.7395keywords:
subject
Has Abstractpub_date
2000-02-01 00:00:00pages
182-8issue
2eissn
0016-6480issn
1095-6840pii
S0016-6480(99)97395-1journal_volume
117pub_type
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