JOE
HOME HELP CONTACT US SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Endocrinology (1975) 66, 183-193       DOI: 10.1677/joe.0.0660183
© 1975 Society for Endocrinology
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by GUPTA, D.
Right arrow Articles by EICHNER, M.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by GUPTA, D.
Right arrow Articles by EICHNER, M.

LEVELS OF LUTEINIZING HORMONE, FOLLICLE-STIMULATING HORMONE, TESTOSTERONE AND DIHYDROTESTOSTERONE IN THE CIRCULATION OF SEXUALLY MATURING INTACT MALE RATS AND AFTER ORCHIDECTOMY AND EXPERIMENTAL BILATERAL CRYPTORCHIDISM

 D. GUPTA, K. RAGER, J. ZARZYCKI and M. EICHNER

Plasma concentrations of LH, FSH, testosterone and dihydrotestosterone (DHT) have been measured in normal sexually maturing male rats from the age of 16–90 days. Between 16 and 25 days plasma testosterone levels were low, but rose suddenly on day 26. A similar increment occurred at the same time in plasma DHT levels, but this steroid reached its peak concentration later than testosterone. Plasma LH levels rose steadily from day 25 onwards, reaching their highest values on day 30. A marked increase in FSH levels was found on day 16, and a peak was reached on day 33 followed by a decline to a level characteristic of the adult. In addition, plasma levels of all these hormones were estimated in the male animals at various stages of development after orchidectomy and cryptorchidism. Four days after operation, the plasma levels of LH and FSH in the orchidectomized animals reached higher levels than those found in the intact animals, indicating the existence of a dynamic feedback relationship before puberty between gonadal steroids and pituitary gonadotrophic secretion. However, results from the experimental bilaterally cryptorchid animals, suggested that the gonadal steroid–gonadotrophic feedback relationship could not be the only factor initiating puberty.




This article has been cited by other articles:


Home page
 Integr. Comp. Biol.Home page
N. Perfito and G. E. Bentley
Opportunism, photoperiodism, and puberty: Different mechanisms or variations on a theme?
Integr. Comp. Biol., November 1, 2009; 49(5): 538 - 549.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Endocrinol. Metab.Home page
A. S. Kauffman, V. M. Navarro, J. Kim, D. K. Clifton, and R. A. Steiner
Sex differences in the regulation of Kiss1/NKB neurons in juvenile mice: implications for the timing of puberty
Am J Physiol Endocrinol Metab, November 1, 2009; 297(5): E1212 - E1221.
[Abstract] [Full Text] [PDF]

Home page
 J. Clin. Endocrinol. Metab.Home page
T. Guran, G. Tolhurst, A. Bereket, N. Rocha, K. Porter, S. Turan, F. M. Gribble, L. D. Kotan, T. Akcay, Z. Atay, et al.
Hypogonadotropic Hypogonadism due to a Novel Missense Mutation in the First Extracellular Loop of the Neurokinin B Receptor
J. Clin. Endocrinol. Metab., October 1, 2009; 94(10): 3633 - 3639.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Endocrinol. Metab.Home page
H. Kishi, M. Itoh, S. Wada, Y. Yukinari, Y. Tanaka, N. Nagamine, W. Jin, G. Watanabe, and K. Taya
Inhibin is an important factor in the regulation of FSH secretion in the adult male hamster
Am J Physiol Endocrinol Metab, April 1, 2000; 278(4): E744 - E751.
[Abstract] [Full Text] [PDF]


HOME HELP CONTACT US SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1975 by the Society for Endocrinology.