The effect of ghrelin, a recently characterized endogenous receptor agonist for growth hormone (GH) secretagogue receptors, on feeding and penile erection was compared with that of EP 80661, a peptide analogue of the GH secretagogue hexarelin, previously identified for its pro-erectile activity when injected into the paraventricular nucleus of the hypothalamus of male rats. Ghrelin (0.01-1 microg), but not EP 80661 (0.02-1 microg), was found to be particularly effective in enhancing feeding. The minimal effective dose of ghrelin was 0.1 microg, which increased food intake by 88%, while the maximal response (355% above control values) was found with 1 microg of the peptide. The enhancing effect of ghrelin on feeding was prevented by the prior administration of the neuropeptide Y Y5 receptor antagonist (DTyr(2), DThr(32)) neuropeptide Y (NPY, 10 microg), but not by the GH-RH receptor antagonist MZ-4-71 (10 microg), or by EP 91073, a hexarelin analogue that antagonizes the pro-erectile effect of EP 80661 (10 microg), given into the lateral ventricles. In contrast, ghrelin failed to induce penile erection at all doses tested, while EP 80661 induced penile erection in a dose-dependent manner. The pro-erectile effect of EP 80661 was prevented by EP 91073 (10 microg), but not by (DTyr(2), DThr(32)) NPY (10 microg) or by the GH-RH receptor antagonist MZ 4-71 (10 microg), given into the lateral ventricles. The present results provide further support to the hypothesis that the GH secretagogue receptors mediating feeding are different from those mediating penile erection and activated by pro-erectile EP peptides.
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http://dx.doi.org/10.1016/s0304-3940(02)00673-0 | DOI Listing |
Investig Clin Urol
January 2025
National Research Center for Sexual Medicine and Department of Urology, Inha University College of Medicine, Incheon, Korea.
Purpose: To investigate the therapeutic potential of eliminating insulin-like growth factor-binding protein 5 (IGFBP5) expression in improving erectile function in mice with cavernous nerve injury (CNI)-induced erectile dysfunction (ED).
Materials And Methods: Eight-week-old male C57BL/6 mice were divided into four groups: a sham-operated group and three CNI-induced ED groups. The CNI-induced ED groups were treated with intracavernous injections 3 days before the CNI procedure.
Int J Med Sci
January 2025
Department of General Medicine, Yalamanchi Hospitals and Research Centre, Vijayawada-520002, Andhra Pradesh, India.
LN18178 is a standardized, synergistic combination of fruit rind and seed extracts, which has been reported to increase serum testosterone levels in young and aging males. The present 84-day randomized, double-blind, placebo-controlled study assessed the efficacy of LN18178 on the sexual function of aging male volunteers (age: 40-70 years; serum total testosterone: ≥ 300 ng/dL). The subjects with mild to moderate erectile dysfunction [5-item version of the International Index of Erectile Function (IIEF-5) scores 17-25] and low sexual desire (score < 3 on items 11 and 12 of IIEF) participated in this investigation.
View Article and Find Full Text PDFGenes (Basel)
December 2024
Department of Foundations of Medicine, NYU Grossman Long Island School of Medicine, 101 Mineola Blvd, Mineola, NY 11501, USA.
Erectile dysfunction (ED) is a pathophysiological condition in which the patients cannot achieve an erection during sexual activity, and it is often overlooked yet prevalent among diabetic men, globally affecting approximately 35-75% of diabetic individuals. The precise mechanisms through which diabetes contributes to ED remain elusive, but the existing literature suggests the potential involvement of nerve and vascular damage that affects the penile supply. In the present review, we reanalyze the existing human single-cell transcriptomic data from patients having diabetes mellitus-associated ED with normal erections.
View Article and Find Full Text PDFJ Nippon Med Sch
January 2025
Department of Plastic, Reconstructive, and Aesthetic Surgery, Nippon Medical School Hospital.
The reliable engraftment of skin grafts into areas with complex shapes can be challenging. Here, we report a case of successful fixation of a genital skin graft using negative pressure wound therapy (NPWT) with RENASYS Cotton Filler. A 44-year-old male with no relevant medical history underwent split-thickness skin grafting for a genital skin defect caused by Fournier's gangrene.
View Article and Find Full Text PDFJ Sex Med
January 2025
Department of Urology, Holmesglen Private Hospital, Moorabbin 3189, Victoria, Australia.
Background: The penile suspensory ligament (PSL) plays a significant role in penile support and erection and its injury or congenital absence may result in functional impairment of erectile function.
Aim: To describe the diagnosis and surgical repair technique for PSL abnormalities and overall outcomes.
Methods: A comprehensive review of the literature was performed to understand the anatomic relevance of the PSL and historical management of PSL defects.
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