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Abstract
Background and Aim:Estrogen activity, a central component of reproductive growth, is regulated by the receptor proteins, estrogen receptor alpha (ERα), and ER beta (ERβ) in chickens as in many other species. ERα expresses predominantly in gonads. Although the expression of ERα in embryonic gonads has been studied in detail, the expression of ERα in post-hatching male gonads has not been studied adequately. Therefore, the current research was conducted to determine the post-hatching changes in the expression of ERα in the left gonads of male chickens with age.Materials and Methods:Shaver Brown male chickens were raised and cared for according to the management guide and sacrificed at the intervals of 1, 4, and 8 weeks of age. The total RNA was extracted from the left gonads using the Trizol method and reverse transcribed using a pair of gene-specific primers. Following polymerase chain reaction amplification, the expression of ERα was quantified relative to the expression of the reference gene GAPDH.Results:The results showed that ERα expression significantly increases with age at p=0.0032. However, the increment of ERα expression from week 1 to week 4 was 2.04-fold and from week 4 to week 8 was 1.39-fold, with the later age reflecting a diminishing pattern in the increment.Conclusion:These results differentiate the post-hatching ERα expression of the left gonads of male chickens increase with age but with a diminishing gradient that may support their reproductive functions in later stages of life.
Highlights
Estrogen is the primary female sex hormone which is responsible for the development and regulation of the female reproductive system and secondary sex characteristics [1]
The results showed that ERα expression significantly increases with age at p=0.0032
These results differentiate the post-hatching ERα expression of the left gonads of male chickens increase with age but with a diminishing gradient that may support their reproductive functions in later stages of life
Summary
Estrogen is the primary female sex hormone which is responsible for the development and regulation of the female reproductive system and secondary sex characteristics [1]. Cellular estrogen activity is regulated by receptor proteins called estrogen receptors (ERs) which has two subtypes in vertebrates, ER alpha (ERα) and ER beta (ERβ) [2,3]. Research over the past two decades shows estrogen plays a key role in the development and regulation of the male reproductive system [4]. Synthesis of estrogen and the relationship of estrogen and male reproductive performances have been previously studied in many species [6,7]. A central component of reproductive growth, is regulated by the receptor proteins, estrogen receptor alpha (ERα), and ER beta (ERβ) in chickens as in many other species. The current research was conducted to determine the posthatching changes in the expression of ERα in the left gonads of male chickens with age
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