A Mouse Model to Investigate the Impact of Gender Affirming Hormone Therapy with Estradiol on Reproduction.

Gender-affirming hormone therapy (GAHT) can help transgender and/or gender diverse (TGD) individuals achieve emobidment goals that align with their transition needs. Clinical evidence from estradiol (E)-GAHT patients indicate widespread changes in tissues sensitive to E and testosterone (T), particularly in the reproductive system. Notably, E-GAHTs effects on hormones and reproduction vary greatly between patients. With the goal of informing clinical research and practice for TGD individuals taking E, this study examines intact male mice implanted with capsules containing one of three different E doses (low 1.25 mg; mid 2.5 mg; high 5 mg), or a blank control capsule. All E-GAHT doses suppress T and follicle stimulating hormone levels while elevating E levels. Only the high E-GAHT dose significantly supresses luteinizing hormone levels. All E-GAHT doses affect epididymis tubule size similarly while seminiferous tubule morphology and bladder weight changes are dose-dependent. E-GAHT does not alter the presence of mature sperm, though E-exposed sperm have altered motility. These data represent the first evidence that mouse models offer an effective tool to understand E-GAHTs impact on reproductive health and the dose-dependent effects of this model permit examinations of diverse patient outcomes.

Impaired in vitro fertilization outcomes following testosterone treatment improve with washout in a mouse model of gender-affirming hormone treatment.

BACKGROUND: The impact of gender-affirming testosterone on fertility is poorly understood, with ovarian histopathologic studies showing variable results, some with a detrimental effect on reproductive capacity and uncertain reversibility. Assisted reproductive outcome data are restricted to small case series that lack the ability to inform clinical practice guidelines and limit fertility preservation counseling for transgender and nonbinary individuals. OBJECTIVE: This study aimed to determine the impact of current testosterone and testosterone washout on in vitro fertilization outcomes in a mouse model for gender-affirming hormone treatment. We hypothesized that current or previous testosterone treatment would not affect in vitro fertilization outcomes. STUDY DESIGN: C57BL/6N female mice (n=120) were assigned to 4 treatment groups: (1) current control, (2) current testosterone, (3) control washout, and (4) testosterone washout. Testosterone implants remained in situ for 6 or 12 weeks, representing the short- and long-term treatment arms, respectively. Current treatment groups underwent ovarian stimulation with implants in place, and washout treatment groups were explanted and had ovarian stimulation after 2 weeks. Oocytes were collected, fertilized, and cultured in vitro, with one arm continuing to the blastocyst stage and the other having transfer of cleavage-stage embryos. Statistical analysis was performed using GraphPad Prism, version 9.0 and R statistical software, version 4.1.2, with statistical significance defined by P<.05. RESULTS: Current long-term testosterone treatment impaired in vitro fertilization outcomes, with fewer mature oocytes retrieved (13.7±5.1 [standard deviation] vs 28.6±7.8 [standard deviation]; P<.0001) leading to fewer cleavage-stage embryos (12.1±5.1 vs 26.5±8.2; P<.0001) and blastocysts (10.0±3.2 vs 25.0±6.5; P<.0001). There was recovery of in vitro fertilization outcomes following washout in the short-term treatment cohort, with incomplete reversibility in the long-term cohort. Testosterone did not negatively affect maturity, fertilization, or blastulation rates. CONCLUSION: In a mouse model of gender-affirming hormone treatment, testosterone negatively affected oocyte yield without affecting oocyte quality. Our findings suggest that testosterone reversibility is duration-dependent. These results demonstrate the feasibility of in vitro fertilization without testosterone discontinuation while supporting a washout period for optimization of mature oocyte yield.

A Pilot Study of Home-Based Exercise and Personalized Nutrition Counseling Intervention in Endometrial Cancer Survivors.

INTRODUCTION: To assess the feasibility of a home-based aerobic exercise and nutrition counseling intervention and effect on cardiorespiratory fitness, cardiovascular disease risk profile, and immune response in obese endometrial cancer survivors. METHODS: A longitudinal pilot study assessed a 12-week home-based aerobic exercise and nutrition counseling intervention in obese endometrial cancer survivors. The primary outcome was feasibility defined as 80% adherence to weekly walking sessions calculated among individuals that completed the intervention. Secondary outcomes comprised pre- and post-intervention differences in cardiorespiratory fitness, cardiovascular risk factors, and T-cell function. Descriptive statistics summarized data. Wilcoxon sign tests identified differences between and pre and post-intervention variables. RESULTS: Nineteen women with stage 1 endometrial cancer consented; 9 withdrew and one was a screen failure. Median adherence to weekly walking sessions was 83.3%. Body composition was significantly altered with a reduction in median fat mass from 52.5 kg to 46.9 kg (p=0.04), and BMI from 37.5 kg/m2 to 36.2 kg/m2 (p = 0.004). There was no significant difference in cardiorespiratory fitness or cardiovascular parameters. The percentage of CD4+ and CD8+ T-cells producing IFNγ towards MAGE-A4 significantly increased from and 5.9% to 7.2% (p=0.043) and 13.9% to 14.8% (p=0.046), respectively. There were 3 related adverse events: hip pain, back sprain, and abdominal pain. DISCUSSION: Our home-based exercise and nutrition counseling program was feasible based on 80% adherence to walking sessions and favored altered body composition. However, the discontinuation rate was high and further research is needed to overcome barriers to implementation. Improvement in cardiovascular parameters will most likely require longer and more intensive programs.

Reproductive potential and fertility preservation in transgender and nonbinary individuals.

PURPOSE OF REVIEW: To synthesize recent literature to better understand parenting desires and challenges of transgender individuals as well as the impact of gender-affirming care on reproductive potential. RECENT FINDINGS: Survey studies of transgender and nonbinary individuals demonstrate significant parenting interest, yet uptake in fertility preservation services remains low with potential for decisional regret. Masculinizing hormones have demonstrated variable effects on folliculogenesis and follicle distribution in the human ovary. In the mouse model, testosterone administration has demonstrated an increase in atretic late antral follicles without a reduction in primordial or total antral follicle counts and a preserved ability to respond to gonadotropin stimulation. Case series of transgender individuals undergoing oocyte or embryo cryopreservation are promising with outcomes similar to cisgender controls. Feminizing hormones have shown detrimental effects on sperm parameters at time of cryopreservation and spermatogenesis in orchiectomy samples with uncertainty regarding the reversibility of these changes. SUMMARY: Current evidence demonstrates variable effects of gender-affirming hormones on ovarian and testicular function with potential for detrimental impact on an individual's reproductive potential. As many individuals initiate gender-affirming care prior to or during their reproductive years it is imperative that they receive thorough fertility preservation counseling and improved access to reproductive care services.

Approaches to Vaginal Bleeding and Contraceptive Counseling in Transgender and Gender Nonbinary Patients.

The transgender community has faced a long-standing history of prejudice and discrimination that has negatively affected their health. A lack of health care provider education and comfort with transgender medicine further challenges the ability of this population to obtain competent, gender-affirming medical care. As with all patients, a thorough patient history with avoidance of assumptions of sexual orientation based on gender identity is integral to providing appropriate care for transgender individuals. Vaginal bleeding in transgender men should be evaluated in a similar manner to natal women, and with knowledge of the individual's present reproductive organs. The majority of transgender men receiving gender-affirming hormone therapy will have cessation of menses by 6 months of continuous use; thus, bleeding beyond this interval warrants measurement of hormone levels and further evaluation. Progesterone-only contraceptive methods including progesterone-only pills, medroxyprogesterone acetate, or a levonorgestrel intrauterine device can be used in transgender men and nonbinary patients with continued menses despite physiologic testosterone levels, or to act as a bridge method for menstrual cessation at the time of testosterone initiation. For bleeding refractory to progesterone methods, health care providers should discuss surgical options or the use of aromatase inhibitors with their patients. Counseling on fertility desires and family planning is integral to improving the reproductive care of transgender patients. Contraceptive counseling for transgender patients should include not only the efficacy and ease of use of available methods, but also discussion of advantages and disadvantages of contraceptive options with regard to the patient's gender identity.

Long-term effect of PROLI/NO on cellular proliferation and phenotype after arterial injury.

Vascular interventions are associated with high failure rates from restenosis secondary to negative remodeling and neointimal hyperplasia. Periadventitial delivery of nitric oxide (NO) inhibits neointimal hyperplasia, preserving lumen patency. With the development of new localized delivery vehicles, NO-based therapies remain a promising therapeutic avenue for the prevention of restenosis. While the time course of events during neointimal development has been well established, a full characterization of the impact of NO donors on the cells that comprise the arterial wall has not been performed. Thus, the aim of our study was to perform a detailed assessment of proliferation, cellularity, inflammation, and phenotypic cellular modulation in injured arteries treated with the short-lived NO donor, PROLI/NO. PROLI/NO provided durable inhibition of neointimal hyperplasia for 6 months after arterial injury. PROLI/NO inhibited proliferation and cellularity in the media and intima at all of the time points studied. However, PROLI/NO caused an increase in adventitial proliferation at 2 weeks, resulting in increased cellularity at 2 and 8 weeks compared to injury alone. PROLI/NO promoted local protein S-nitrosation and increased local tyrosine nitration, without measurable systemic effects. PROLI/NO predominantly inhibited contractile smooth muscle cells in the intima and media, and had little to no effect on vascular smooth muscle cells or myofibroblasts in the adventitia. Finally, PROLI/NO caused a delayed and decreased leukocyte infiltration response after injury. Our results show that a short-lived NO donor exerts durable effects on proliferation, phenotype modulation, and inflammation that result in long-term inhibition of neointimal hyperplasia.