Poult. Sci.
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Poultry Science, Vol 82, Issue 8, 1302-1306
Copyright © 2003 by Poultry Science Association

Articles

Presence of calcitonin receptors in shell gland of the guineafowl and changes in binding property during an oviposition cycle

H Ogawa, T Takahashi, T Kuwayama, and M Kawashima

Department of Animal Science, Tokyo University of Agriculture, Atsugi-shi, Kanagawa 243-0034, Japan.

Radioligand binding assays of membrane fraction of the shell gland endometrium of guineafowl revealed the presence of receptor for calcitonin. The equilibrium dissociation constant (Kd) obtained by Scatchard analyses was 0.50 to 1.25 nM in laying birds and 1.12 to 1.19 nM in nonlaying birds. The maximum binding capacity (Bmax) per milligram of protein was 33.1 to 107.5 femtomoles in laying birds and 101.4 to 114.9 femtomoles in nonlaying birds. Both Kd and Bmax values changed during eggshell formation in laying birds. The results suggest that calcitonin receptor binding may be related to eggshell formation in guineafowl.


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S. M Krzysik-Walker, O. M Ocon-Grove, S. B Maddineni, G. L Hendricks III, and R. Ramachandran
Identification of Calcitonin Expression in the Chicken Ovary: Influence of Follicular Maturation and Ovarian Steroids
Biol Reprod, October 1, 2007; 77(4): 626 - 635.
[Abstract] [Full Text] [PDF]


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