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This report highlights the usefulness of specific diagnostic procedures, including penile/preputial cytology and transabdominal ultrasonography, in diagnosing cryptorchidism and Sertoli cell tumors in dogs with generalized skin conditions.

In this study, a very low-calorie ketogenic diet significantly improved metabolic and hormonal profiles in obese men, but did not significantly enhance most semen parameters except for sperm motility.

This study found that while iron depletion through phlebotomies is safe for women with functional ovarian hyperandrogenism, it does not improve their cardio-metabolic profile and may reduce non-enzymatic antioxidant capacity.

This case report describes a Canadian Husky dog with sertolioma that exhibited dermatological symptoms and aggressive behavior, both of which improved significantly after surgery.

A thorough initial check-up is essential before sperm banking to ensure the best chance of preserving good quality sperm.

This abstract provides definitions and descriptions of various medical and scientific terms but reports no new research findings.

FDG PET/CT can improve cancer treatment plans in dogs.

This review provides an update on sex hormone-associated dermatoses in dogs, detailing known conditions like feminization syndrome and exploring less understood issues such as alopecia X, without presenting new clinical findings.

This study observed that during male silkmoth development, trichogen cells in olfactory sensilla undergo significant membrane recycling, contributing to sensillum structure formation in a precisely timed series of stages.

This study found that intradermal spermidine injections stimulated cell proliferation and increased fibre length growth rate in wool follicles of Merino lambs, without significantly affecting fibre diameter.

This study found that overexpression of an enzyme in transgenic mice led to distorted polyamine levels, resulting in permanent hair loss and female infertility.

This study found that zinc is primarily located in the tails of mature rat sperm, associated with -S-S-bonded structures, and suggests a possible similarity in zinc interactions between sperm keratin and hair proteins.

This study observed varying levels of polyamines in different compartments of rat hair follicles, indicating their potential involvement in hair growth, especially in the matrix and inner root sheath layers.

This study found that in male rats, finasteride significantly decreased spermatogonia and primary spermatocytes numbers and increased Leydig cells, but did not affect overall testis histology or spermatogenesis.

This review discusses the biology of spermatogenesis and male reproductive toxicology but reports no new research findings.

This study found that finasteride treatment in adult hamsters led to significant testicular alterations and reduced spermatogenesis compared to untreated controls.

The researchers reported that both estrogen receptors ERα and ERβ are expressed in human testis, and identified two novel genes, Aven and Regucalcin, linked to estrogen and androgen regulation, which may be crucial for spermatogenesis.

In this study, finasteride treatment for 56 days in adult rats led to sloughing of immature germinal cells and reduced sperm content in the epididymis, indicating its importance for maintaining spermatogenesis.

This study suggests that increased putrescine levels may disrupt normal hair follicle development in transgenic mice, leading to hair loss and altered skin structure, yet these mice appear more resistant to skin tumorigenesis.

This study identified that spermidine-mediated activation of eIF5A by hypusination plays a significant role in Arabidopsis thaliana growth, flowering time, stress adaptation, and development, including changing root and aerial architecture.

In this study, topical application of α-methylspermidine during the telogen phase in mice induced hair growth by increasing the polyamine pool and mimicking the anagen phase's characteristics.

In this study, the researchers discovered that specific polyamine depletion enhances stemness in hair follicle stem cells through a mechanism independent of mRNA translation.

This study discovered that in *Drosophila*, knockdown of specific storage proteins in adipocytes decreased germline stem cell maintenance, implicating a role for these proteins in adult tissue regulation.

This study found that Finasteride at doses of 5 mg or higher may reduce the expression of key spermatogenesis biomarkers, potentially impacting male fertility in mice.

In this study, oral spermidine supplementation was found to significantly prolong the hair follicle anagen phase and reduce hair loss, with effects persisting three months after treatment in healthy participants, suggesting potential therapeutic benefits for hair loss conditions.

In this study, transgenic mice overexpressing the SSAT gene were highly sensitive to polyamine analogues, leading to severe liver changes and high mortality rates after treatment.

This study found that spermidine, a polyamine, plays an essential role in hair growth in sheep follicles, while spermine is not required for normal follicle function.

This research suggests that defects in keratinocyte differentiation due to putrescine accumulation in SSAT transgenic mice lead to skin changes and hair loss, and reducing putrescine can promote hair regrowth.

This study found that the spermidine analog N1-methylspermidine prolonged hair follicle growth and decreased inflammation and oxidative stress in cultured hair follicles, suggesting potential relevance for treating inflammatory scalp diseases.