Seasonal Changes in Plasma Hormones, Sex-Related Genes Transcription in Brain, Liver and Ovary during Gonadal Development in Female Rainbow Trout (Oncorhynchus mykiss)

Chen, Huiqin; Bi, Baoliang; Kong, Lingyin; Hua, Rong; Su, Yanhua; Hu, Qing

doi:10.3390/fishes6040062

Cited by 5 publications

(3 citation statements)

References 61 publications

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“…After 21 days of treatment with CAU, GSI significantly increased in both males and females (Figure 6a), while HSI was lower in females only (Figure 6b). This concurrent increase of GSI and the decrease of HSI in female fish might be due to the transcription of sex-related genes during gonadal development, as previously observed in female rainbow trout [38]. Indeed, HSI increases at an early stage of ovary maturation in various fish species, while it decreases at a late stage of ovary maturation [39].…”

Section: Effects Of Cau On Zebrafish Gonadal Differentiationsupporting

confidence: 72%

An Alkaloid from a Highly Invasive Seaweed Increases the Voracity and Reproductive Output of a Model Fish Species

et al. 2022

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The invasive macroalga Caulerpa cylindracea has spread widely in the Mediterranean Sea, becoming a favorite food item for native fish for reasons yet unknown. By using a combination of behavioral, morphological, and molecular approaches, herein we provide evidence that the bisindole alkaloid caulerpin, a major secondary metabolite of C. cylindracea, significantly increases food intake in the model fish Danio rerio, influencing the regulation of genes involved in the orexigenic pathway. In addition, we found that the compound improves fish reproductive performance by affecting the hypothalamus–pituitary–gonadal axis. The obtained results pave the way for the possible valorization of C. cylindracea as a sustainable source of a functional feed additive of interest to face critical challenges both in aquaculture and in human nutrition.

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Section: Effects Of Cau On Zebrafish Gonadal Differentiationsupporting

confidence: 72%

An Alkaloid from a Highly Invasive Seaweed Increases the Voracity and Reproductive Output of a Model Fish Species

et al. 2022

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“…In many fish species, the liver undergoes seasonal variations in size and in the content of fat and glycogen, and these changes depend on the fish gender and estrogen concentrations, as they can be abolished either by ovariectomy in females or by the administration of estrogen to mature males (Ishii and Yamamoto 1970 ). Recently, Chen and coworkers (Chen et al 2021 ) described season-related differences in the gene expression of estrogen receptors and vitellogenin in the liver of rainbow trout. Similar to our observation for carp, the constitutive expression of these genes in rainbow trout was higher in the course of autumn (October–November) than in the spring.…”

Section: Discussionmentioning

confidence: 99%

“…For example, in common carp higher concentrations of 17β-estradiol (E2) were usually observed in April and November, while their lowest concentrations occur in August (Saha et al 2002 ; Taghizadeh et al 2013 ). In turn, in rainbow trout, a higher level of E2 was reported in May and in September (Chen et al 2021 ). In addition, high E2 concentrations affect the level of vitellogenin, as well as the expression of estrogen receptors and aromatase (Nelson et al 2007 ; Nagler et al 2012 ; Ye et al 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Season affects the estrogen system and the immune response of common carp

Maciuszek,

Pijanowski,

Kemenade

et al. 2023

Fish Physiol Biochem

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The physiology of ectothermic animals, including fish, is strictly regulated by season-related external factors such as temperature or photoperiod. The immune response and the production of hormones, such as estrogens, are therefore also subject to seasonal changes. This study in common carp aimed to determine how the season affects the estrogen system and the immune response, including the antibacterial response during Aeromonas salmonicida infection. We compared the immune reaction in spring and autumn in the head kidney and liver and found that carp have higher levels of blood 17β-estradiol in autumn, while in the liver of these fish there is a higher constitutive expression of genes encoding vitellogenin, estrogen receptors and Cyp19 aromatase than in spring. Fish sampled in autumn also exhibited higher expression of immune-related genes in the liver. In contrast, in the head kidney from fish sampled in the autumn, the expression of genes encoding estrogen receptors and aromatase was lower than in spring, and a similar profile of expression was also measured in the head kidney for inos, arginases and il-10. In turn, during bacterial infection, we observed higher upregulation of the expression of inos, il-12p35, ifnγ-2, arginase 2 and il-10 in the liver of carp sampled in spring. In the liver of carp infected in spring a higher upregulation of the expression of the genes encoding CRPs was observed compared to fish infected during autumn. The opposite trend occurred in the head kidney, where the upregulation of the expression of the genes involved in the immune response was higher in fish infected in autumn than in those infected in spring. During the infection, also season-dependent changes occurred in the estrogen system. In conclusion, we demonstrated that season differentially affects the estrogenic and immune activity of the head kidney and liver. These results reinforce our previous findings that the endocrine and immune systems cooperate in maintaining homeostasis and fighting infection.

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