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Featured researches published by Aya Koda.


Zoological Science | 2000

Effect of Activin A and Follistatin on the Release of Pituitary Hormones in the Bullfrog Rana catesbeiana

Aya Koda; Kazutoshi Yamamoto; Hideho Uchiyama; Hubert Vaudry; Sakae Kikuyama

Abstract The effects of activin A and follistatin on the release of follicle-stimulating hormone (FSH), luteinizing hormone (LH), growth hormone (GH) and prolactin (PRL) from dispersed pituitary cells of the bullfrogs Rana catesbeiana were studied. Activin A stimulated the release of FSH, GH, and PRL dosedependently, but not that of LH. Follistatin suppressed the activin-induced FSH, GH, and PRL release, but did not affect the basal secretion of those hormones. From the results obtained in this experiment, together with the previously obtained findings that activin B enhanced the release of FSH, LH, GH, and PRL, we conclude that activin A, in addition to activin B, influences the function of multiple types of pituitary cells in the bullfrog.


Journal of Biological Chemistry | 2001

Bullfrog Ghrelin Is Modified by n-Octanoic Acid at Its Third Threonine Residue

Hiroyuki Kaiya; Hiroshi Hosoda; Aya Koda; Kazutoshi Yamamoto; Yasuo Kitajima; Masaru Matsumoto; Yoshiharu Minamitake; Sakae Kikuyama; Kenji Kangawa


Endocrinology | 2002

A Novel Amphibian Hypothalamic Neuropeptide: Isolation, Localization, and Biological Activity

Aya Koda; Kazuyoshi Ukena; Hitoshi Teranishi; Shinji Ohta; Kazutoshi Yamamoto; Sakae Kikuyama; Kazuyoshi Tsutsui


Endocrinology | 2003

Novel Neuropeptides Related to Frog Growth Hormone-Releasing Peptide: Isolation, Sequence, and Functional Analysis

Kazuyoshi Ukena; Aya Koda; Kazutoshi Yamamoto; Tetsuya Kobayashi; Eiko Iwakoshi-Ukena; Hiroyuki Minakata; Sakae Kikuyama; Kazuyoshi Tsutsui


General and Comparative Endocrinology | 2004

Development of radioimmunoassay for bullfrog thyroid-stimulating hormone (TSH): effects of hypothalamic releasing hormones on the release of TSH from the pituitary in vitro

Reiko Okada; Kazutoshi Yamamoto; Aya Koda; Yoichi Ito; Hiroaki Hayashi; Shigeyasu Tanaka; Yoichi Hanaoka; Sakae Kikuyama


General and Comparative Endocrinology | 2006

Identification of immunoreactive plasma and stomach ghrelin, and expression of stomach ghrelin mRNA in the bullfrog, Rana catesbeiana.

Hiroyuki Kaiya; Ichiro Sakata; Kazutoshi Yamamoto; Aya Koda; Takafumi Sakai; Kenji Kangawa; Sakae Kikuyama


General and Comparative Endocrinology | 2000

Occurrence of Immunoreactive Activin/Inhibin βB in Thyrotropes and Gonadotropes in the Bullfrog Pituitary: Possible Paracrine/Autocrine Effects of Activin B on Gonadotropin Secretion

Hideho Uchiyama; Aya Koda; Shinji Komazaki; Mina Oyama; Sakae Kikuyama


Journal of Experimental Zoology Part A: Comparative Experimental Biology | 2006

Structures and diverse functions of frog growth hormone-releasing peptide (fGRP) and its related peptides (fGRP-RPs): a review.

Kazuyoshi Ukena; Aya Koda; Kazutoshi Yamamoto; Eiko Iwakoshi-Ukena; Hiroyuki Minakata; Sakae Kikuyama; Kazuyoshi Tsutsui


General and Comparative Endocrinology | 2001

Cosecretion of Prolactin and Growth Hormone by Dispersed Pituitary Cells of the Adult Bullfrog, Rana catesbeiana

Atsuko Oguchi; Tomomi Aida; Aya Koda; Seiji Shioda; Shigeo Nakajo; Tetsuya Kobayashi; Shigeyasu Tanaka; Kazutoshi Yamamoto; Sakae Kikuyama


Zoological Science | 2005

STUDIES OF GHRELIN-INDUCED GROWTH HORMONE AND PROLACTIN RELEASE FROM THE BULLFROG PITUITARY(Endocrinology,Abstracts of papers presented at the 76^ Annual Meeting of the Zoological Society of Japan)

Aya Koda; Hiroyuki Kaiya; Kazutoshi Yamamoto; Kazuyoshi Tsutsui; Kenji Kangawa; Sakae Kikuyama

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