OJAS  Vol.9 No.1 , January 2019
Calcium Participates in Secretion of Porphyrin from Shell Gland Epithelial Cells of Japanese Quail (Coturnix coturnix japonica)

To investigate factors involved in the secretion of protoporphyrin IX (PpIX), a superficial eggshell pigment, from shell gland epithelial cells of Japanese quail, we cultured cells in Ham’s F12 medium with calcium chloride and quail plasma. The addition of hormones (prostaglandin F2α, progesterone, estradiol-17β) to the medium did not change the PpIX concentration in the culture supernatant, but changing the calcium chloride (CaCl2) concentration did: a lower concentration of CaCl2 led to a higher PpIX concentration; 0 mM CaCl2 enhanced the secretion of PpIX from epithelial cells prepared at 5 or 7 mM CaCl2. The result suggests that a drop in concentration of CaCl2 mimics the end of shell calcification and stimulates rapid secretion of PpIX in vivo. Bovine serum albumin was almost as effective as quail plasma for PpIX secretion in culture, and would facilitate further study of the mechanism of PpIX secretion.

Cite this paper: Kai, O. (2019) Calcium Participates in Secretion of Porphyrin from Shell Gland Epithelial Cells of Japanese Quail (Coturnix coturnix japonica). Open Journal of Animal Sciences, 9, 151-161. doi: 10.4236/ojas.2019.91013.

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