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Cycle‐related LHRH responsiveness of superfused pituitary cells in a Phenol red free medium
Author(s) -
O'Conner James L.,
Kellom Theresa A.
Publication year - 1990
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(90)80580-c
Subject(s) - phenol red , medicine , endocrinology , red cell , phenol , anterior pituitary , hormone , estrous cycle , luteinizing hormone , chemistry , biology , chromatography , organic chemistry
Anterior pituitary cell cultures are frequently used in studying the control of gonadotropin secretion. Historically, many (if not most) of these studies have been performed in the presence of Phenol red as a pH indicator. Phenol red preparations, because of their potential estrogenic activity, may have influenced the results of previous studies defining the relative luteinizing hormone releasing hormone responsiveness of rat anterior pituitary cells derived from various stages of the estrous cycle. We therefore felt it of interest to investigate this possibility by repeating our previous cycle‐related superfusion studies [(1988) Life Sci. 42, 61‐72] in the absence of these Phenol red preparations. Comparisons of data obtained in the presence or absence of Phenol red revealed cells derived from late proestrous (19.00) and cultured in the absence of Phenol red continued to evidence the highest LH responsiveness. However, diestrous 1 08.00 cells cultured in the absence of Phenol red were lower in responsiveness than previously observed in the presence of the substance and the responsiveness of proestrous 08.00 and 15.00 in the presence was lower in comparison to the same stages in the absence of Phenol red. The results suggest that Phenol red preparations are capable of modulating LHRH responsiveness in superfusion and that the effect is more pronounced at certain cycle stages than at others.