Diurnal rhythms in testicular blood flow, testicular morphometry and reproductive hormones in Shiba goats

Samir, Haney; Mandour, Ahmed S.; Radwan, Faten; Swelum, Ayman A.; Yoshida, Tomohiko; Tanaka, Ryou; Nagaoka, Kentaro; Watanabe, Gen

doi:10.1071/rd22139

Cited by 6 publications

(5 citation statements)

References 52 publications

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“…Accordingly, differences in circadian variations of both gonadotropins might be related with the fact that differential regulation mechanisms exist for Fsh and Lh release throughout Gnrh in fish (Karigo et al, 2013). Regarding diurnal Fsh variations, changes have been also observed in male humans and rams suggesting that these circadian rhythms might be crucial for the maintenance of the physiological functions of the testis (Brambilla et al, 2009;Zhang et al, 2018;Samir et al, 2022). Effects of melatonin on testicular function and spermatogenesis in bulls have evidenced for an important role of this hormone to improve the efficiency of livestock reproduction (Li et al, 2023).…”

Section: Discussionmentioning

confidence: 99%

MELATONIN INDUCES CHANGES ON THE CIRCADIAN RHYTHMS OF REPRODUCTIVE HORMONES DURING SPERMATOGENESIS IN PUBERTAL MALE SEA BASS,Dicentrarchus labrax

Alvarado,

Espigares,

Carrillo

et al. 2024

Preprint

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Reproduction is a highly demanding biological process that occurs at the optimal time of the year and day to ensure the success of spawn and offspring. Melatonin is a hormone that, secreted mainly by the pineal gland, plays a critical role in the integration of the photoneuroendocrine information from environment (annual and daily variations) to modulate reproductive activity and gonadal development in fish. In this study we assessed the effect of exogenous melatonin on the circadian levels of sex steroids and gonadotropins in pubertal 2 yr-old male sea bass during their reproductive cycle including, pre-spermatogenesis (Pspg), spermiation (Spm) and post-spermiation (PSpm) stages. Our results demonstrated that all reproductive hormones displayed circadian variations along the entire reproductive cycle in pubertal fish. Circulating levels of the luteinizing hormone (Lh) were affected by both melatonin injection and the daily timing of administration during the Spm and PSpm stages, thus evoking variations of Lh levels at night. Melatonin also significantly affected circadian rhythms of Fsh during the Spm stage. Overall, both 11-Kt and T plasma levels displayed circadian variations during the reproductive cycle in the sea bass which were not prevented by melatonin. However, melatonin showed a significant decrease of plasma levels of 11-Kt 1h after dusk during the Pspg stage, while it increased those levels of T 5 h after dusk during the PSpm stage. These findings provide new insights into the role of melatonin in fish reproduction as a key factor in regulation of daily variation of key hormones involved in gonadal development. This circumstance may have implications in the control of gametogenesis and management of fish in aquaculture.HighlightsPlasma levels of Fsh, Lh, T and 11-Kt show daily rhythms in pubertal male sea bass.Melatonin evokes changes in daily rhythms of Lh during the reproductive cycle.Melatonin yields Fsh plasma level differences during spermiation stage.Melatonin elicits T and 11-Kt plasma level differences depending on reproductive stage and time.

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Section: Discussionmentioning

confidence: 99%

MELATONIN INDUCES CHANGES ON THE CIRCADIAN RHYTHMS OF REPRODUCTIVE HORMONES DURING SPERMATOGENESIS IN PUBERTAL MALE SEA BASS,Dicentrarchus labrax

Alvarado,

Espigares,

Carrillo

et al. 2024

Preprint

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“…Deaths and severe economic losses due to heart problems are frequently occurring in ruminant species; however, diagnostic facilities for early detection and accurate diagnosis of cardiac diseases in ruminants are still lacking [86,87]. Moreover, small ruminants such as sheep and goats are useful animal models to study the pathophysiology of ruminants and at the same time are considered efficient models for cardiovascular research [88][89][90].…”

Section: Discussion and Future Perspectivesmentioning

confidence: 99%

Non-Invasive Assessment of the Intraventricular Pressure Using Novel Color M-Mode Echocardiography in Animal Studies: Current Status and Future Perspectives in Veterinary Medicine

Mandour

Farag

Helal

et al. 2023

Animals

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The assessment of diastolic function has received great interest in order to comprehend its crucial role in the pathophysiology of heart failure and for the early identification of cardiac events. Silent changes in the intraventricular flow (IVF) dynamics occur before the deterioration of the cardiac wall, although they cannot be detected using conventional echocardiography. Collective information on left ventricular (LV) pressures throughout the cardiac cycle has great value when dealing with patients with altered hemodynamics. Accurate pressure measurement inside the ventricle can be obtained by invasive methods to determine the LV diastolic pressures, which reflect the myocardial relaxation and compliance. However, catheterization is only feasible in the laboratory setting and is not suitable for clinical use due to its disadvantages. In contrast, echocardiography is simple, safe, and accessible. Color M-mode echocardiography (CMME) is an advanced cardiac evaluation technique that can measure the intraventricular pressure differences (IVPDs) and intraventricular pressure gradients (IVPGs) based on the Doppler shift of the IVF. Recently, the assessment of IVPD and IVPG has gained growing interest in the cardiovascular literature in both animal and human studies as a non-invasive method for the early diagnosis of cardiac dysfunctions, especially diastolic ones. The usability of IVPD and IVPG has been reported in various surgically induced heart failure or pharmacologically altered cardiac functions in rats, dogs, cats, and goats. This report aims to give an overview of the current studies of CMME-derived IVPD and IVPG in animal studies and its feasibility for clinical application in veterinary practice and to provide the prospects of the technique’s ability to improve our understanding.

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“…This study showed a significant elevation in CL area from Day 20 to Day 40 in pregnant buffalos compared to the non-pregnant ones with a marked elevation of plasma progesterone levels in the same group, which could indicate the importance of adequate CL area and diameter to establish the pregnancy. Concomitantly, CL blood flow increased, as evidenced by lowering Doppler indices values (8), in pregnant females compared to those in non-pregnant ones.…”

mentioning

confidence: 88%

“…This study showed that treatment of heat-stressed rams with L-carnitine (LC) exerted a significant improvement in testicular blood perfusion because of reductions of Doppler indices (resistive index: RI and pulsatility index: PI), which explain the elevation of arterial blood perfusion and decrease of the vessel resistance to blood flow (4)(5)(6). In addition, it highlighted the pivotal roles of assessing the echotexture changes of testicular parenchyma in the control and LC-treated rams by computer image analysis (7,8).…”

mentioning

confidence: 99%

Editorial: Exploring roles of diagnostic ultrasonography in veterinary medicine

2022

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Editorial on the Research Topic Exploring roles of diagnostic ultrasonography in veterinary medicineNowadays, ultrasound has become an important diagnostic tool, and its applications are proving more robust and tremendously beneficial in different aspects of veterinary practices. The advent of ultrasonography enables researchers and veterinarians to assess and monitor tremendous physiological and pathological events in the farm, companion, and wild animals (1). Because there is a growing demand for use of ultrasonography in studying, diagnosis, and monitoring many physiological events and diseases of animals, the goal of this special edition Research Topic is to shed light on the progress made in the past decade in applications of diagnostic ultrasonography in different aspects of physiological and pathological issues in the veterinary practices (reproduction, internal medicine, surgery, and cardiology). In this e-collection, 14 articles were published covering the aforementioned objectives and to provide direction and guidance to researchers in the field.The study of Zhang et al. explored the usefulness of ultrasonography and Computer-assisted pixel assessment of the echotextural features of the mammary gland parenchyma in buffaloes during lactation at different somatic cell levels for diagnosing subclinical mastitis. In addition, this study found that examining the structures of the mammary gland parenchyma with vertical positioning showed better results than the horizontal direction. Similarly, in cows (2), it was reported that examining the vertical plane of the mammary gland was more suitable and could describe the significant correlation between echotextural variables and milk composition.Tamura et al. described the usefulness of drip infusion cholangiography with computed tomography (DIC-CT) and abdominal ultrasonography for detecting the site of bile leakage in a dog with biloma [an encapsulated collection of bile outside or inside the biliary tract within the abdominal cavity; (3)]. Abdominal ultrasonography showed an enlargement of the gallbladder with the appearance of a kiwi-like pattern with residual Frontiers in Veterinary Science frontiersin.org

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Diurnal rhythms in testicular blood flow, testicular morphometry and reproductive hormones in Shiba goats

Cited by 6 publications

References 52 publications

MELATONIN INDUCES CHANGES ON THE CIRCADIAN RHYTHMS OF REPRODUCTIVE HORMONES DURING SPERMATOGENESIS IN PUBERTAL MALE SEA BASS,Dicentrarchus labrax

MELATONIN INDUCES CHANGES ON THE CIRCADIAN RHYTHMS OF REPRODUCTIVE HORMONES DURING SPERMATOGENESIS IN PUBERTAL MALE SEA BASS,Dicentrarchus labrax

Non-Invasive Assessment of the Intraventricular Pressure Using Novel Color M-Mode Echocardiography in Animal Studies: Current Status and Future Perspectives in Veterinary Medicine

Editorial: Exploring roles of diagnostic ultrasonography in veterinary medicine

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