Compensated hypogonadism in men with sickle cell disease

Using the consolidated framework for implementation research to identify challenges and opportunities for implementing a reproductive health education program into sickle cell disease care

BACKGROUND

As survival rates for individuals with sickle cell disease (SCD) increase, calls have been made to improve their reproductive healthcare and outcomes. The research team created a web-based program entitled Fertility edUcaTion to Understand ReproductivE health in Sickle cell disease (FUTURES). The study aim was to use the Consolidated Framework for Implementation Research (CFIR) during pre-implementation to identify challenges and opportunities from the individual to systems level of implementation to ultimately optimize the integration of FUTURES into clinical practice.

METHODS

Semi-structured interviews were conducted with clinicians, research team members, and adolescent and young adult (AYA) males with SCD and their caregivers who participated in pilot testing. Interviews (N = 31) were coded inductively and then mapped onto CFIR domains (i.e., outer setting, inner setting, characteristics of individuals, and intervention characteristics).

RESULTS

Research team interviews indicated the lack of universal guidelines for reproductive care in this population and gaps in reproductive health knowledge as key reasons for developing FUTURES, also highlighting the importance of collaboration with community members during development. Clinicians reported intraorganizational communication as essential to implementing FUTURES and discussed challenges in addressing reproductive health due to competing priorities. Clinicians, AYAs, and caregivers reported positive views of FUTURES regarding length, engagement, accessibility, and content. Suggestions for the best setting and timing for implementation varied.

CONCLUSIONS

Using CFIR during the pre-implementation phase highlighted challenges and opportunities regarding integrating this program into SCD care. These findings will inform adaptation and further testing of FUTURES to ensure effective implementation of this novel education program.

Experiences and outcomes of fertility testing in male adolescents with sickle cell disease

Adult males with sickle cell disease (SCD) may have abnormal semen parameters, raising the concern that SCD and/or treatments may impact fertility. Yet, studies that include adolescents are lacking. To determine if fertility testing is feasible in male adolescents with SCD, and to explore their experiences and outcomes of fertility testing, 33 adolescents who completed a web-based SCD reproductive health education program were offered a free semen analysis. Five (15%) obtained testing and each had abnormalities. Barriers to testing included lack of time and transportation and discomfort. Findings highlight the need for larger, longitudinal studies using innovative testing approaches.

Endocrinopathies in Hemoglobinopathies: What Is the Role of Iron?

Hemoglobinopathies, including β-thalassemia and sickle cell disease (SCD), are common genetic blood disorders. Endocrine disorders are frequent manifestations of organ damage observed mainly in patients with β-thalassemia and rarely in SCD. Iron overload, oxidative stress-induced cellular damage, chronic anemia, and HCV infection contribute to the development of endocrinopathies in β-thalassemia. The above factors, combined with vaso-occlusive events and microcirculation defects, are crucial for endocrine dysfunction in SCD patients. These endocrinopathies include diabetes mellitus, hypothyroidism, parathyroid dysfunction, gonadal and growth failure, osteoporosis, and adrenal insufficiency, affecting the quality of life of these patients. Thus, we aim to provide current knowledge and data about the epidemiology, pathogenesis, diagnosis, and management of endocrine disorders in β-thalassemia and SCD. We conducted a comprehensive review of the literature and examined the available data, mostly using the PubMed and Medline search engines for original articles. In the era of precision medicine, more studies investigating the potential role of genetic modifiers in the development of endocrinopathies in hemoglobinopathies are essential.

Study protocol for FUTURES: Testing a web-based reproductive health education program for adolescent and young adult males with sickle cell disease

Individuals with sickle cell disease are increasingly surviving into adulthood, many of whom have interest in future biological parenthood. Reproductive health knowledge is low among adolescent and young adult males and their caregivers. Their understanding of these topics is needed to optimize their reproductive health outcomes. As such, through collaboration with a community advisory board (adolescents and young adults with sickle cell disease and mothers of adolescent and young adult males with sickle cell disease) and digital design team, we developed a web-based sickle cell disease-focused reproductive health program entitled FUTURES to address these knowledge gaps. For phase I of this two phase feasibility and acceptability study, adolescent and young adult males and their caregivers will complete a pre- and post-program reproductive health knowledge and attitudes questionnaire to assess change in knowledge. In phase II, after learning about fertility testing as part of the FUTURES curriculum, adolescent and young adult male participants are given the option to pursue testing. The two-phase study aims to: 1) develop and test the feasibility, acceptability, and efficacy of a reproductive health web-based educational program at increasing reproductive health knowledge in male adolescent and young adult males with sickle cell disease and their caregivers, and 2) assess feasibility of fertility testing. The long-term goal is to improve reproductive and psychosocial outcomes among adolescent and young adult males with sickle cell disease.

Epidemiology of Male Hypogonadism

The epidemiology of male hypogonadism has been understudied. Of the known causes of endogenous androgen deficiency, only Klinefelter syndrome is common with a likely population prevalence of greater than 5:10,000 men (possibly as high as 10-25:10,000). Mild traumatic injury might also be a common cause of androgen deficiency (prevalence 5-10:10,000 men), but large, long-term studies must be completed to confirm this prevalence estimation that might be too high. The classic causes of male androgen deficiency-hyperprolactinemia, pituitary macroadenoma, endogenous Cushing syndrome, and iron overload syndrome-are rare (prevalence < 10,000 men).

Testosterone Deficiency in Sickle Cell Disease: Recognition and Remediation

Hypogonadism is common in men with sickle cell disease (SCD) with prevalence rates as high as 25%. Testicular failure (primary hypogonadism) is established as the principal cause for this hormonal abnormality, although secondary hypogonadism and compensated hypogonadism have also been observed. The underlying mechanism for primary hypogonadism was elucidated in a mouse model of SCD, and involves increased NADPH oxidase-derived oxidative stress in the testis, which reduces protein expression of a steroidogenic acute regulatory protein and cholesterol transport to the mitochondria in Leydig cells. In all men including those with SCD, hypogonadism affects physical growth and development, cognition and mental health, sexual function, as well as fertility. However, it is not understood whether declines in physical, psychological, and social domains of health in SCD patients are related to low testosterone, or are consequences of other abnormalities of SCD. Priapism is one of only a few complications of SCD that has been studied in the context of hypogonadism. In this pathologic condition of prolonged penile erection in the absence of sexual excitement or stimulation, hypogonadism exacerbates already impaired endothelial nitric oxide synthase/cGMP/phosphodiesterase-5 molecular signaling in the penis. While exogenous testosterone alleviates priapism, it disadvantageously decreases intratesticular testosterone production. In contrast to treatment with exogenous testosterone, a novel approach is to target the mechanisms of testosterone deficiency in the SCD testis to drive endogenous testosterone production, which potentially decreases further oxidative stress and damage in the testis, and preserves sperm quality. Stimulation of translocator protein within the transduceosome of the testis of SCD mice reverses both hypogonadism and priapism, without affecting intratesticular testosterone production and consequently fertility. Ongoing research is needed to define and develop therapies that restore endogenous testosterone production in a physiologic, mechanism-specific fashion without affecting fertility in SCD men.