Prof. Ralf Henkel

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https://hdl.handle.net/10566/2094

Prof. Ralf Henkel

Position: Head of Department and Deputy Dean for Postgraduate Studies
Department: Medical BioScience
Faculty: Natural Sciences
Qualifications: BEd, PhD, Habil
My publications in this repository
Tel: 021 959 2332
Fax: 021 959 3125
Email: rhenkel@uwc.ac.za

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Browsing by Author "Bouic, Patrick J.D."

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    Effect of the metabolic syndrome on male reproductive function: a case-controlled pilot study
    (Wiley, 2014) Leisegang, Kristian; Bouic, Patrick J.D.; Henkel, Ralf
    The metabolic syndrome (MetS) is a constellation of various risk factors. This study aimed to investigate the effect of MetS on testosterone and progesterone, and semen parameters, in a case-controlled pilot study. Male patients (n = 54) had body mass index, waist-to-hip ratio (WHR) and blood pressure recorded. Blood was analysed for HDL cholesterol, triglycerides and glucose. Saliva was assayed for free testosterone and free progesterone. Ejaculates were analysed for volume, sperm concentration, total sperm count, motility, vitality, mitochondrial membrane potential (MMP), DNA fragmentation and leucocyte concentration. Participants were divided into the control group (n = 28) and the MetS group (n = 26). Differences were found between the groups for body mass index, WHR, blood pressure, high-density lipoprotein (HDL), triglycerides and glucose. The MetS group showed significant reductions in sperm concentration (P = 0.0026), total sperm count (P = 0.0034), total motility (P = 0.0291), sperm vitality (P = 0.002), MMP (P = 0.0039), free testosterone (P = 0.0093) and free progesterone (P = 0.0130), while values for DNA fragmentation increased (P = 0.0287). Results indicate that patients with MetS have compromised sperm parameters in the absence of leucocytospermia. A reduction in free progesterone suggests that steroidogenesis cascades may be compromised. It is hypothesised that a systemic pro-inflammatory state with oxidative stress associated with MetS may provide a novel explanation.
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    Obesity is associated with increased seminal insulin and leptin alongside reduced fertility parameters in a controlled male cohort
    (BioMed Central, 2014) Leisegang, Kristian; Menkveld, Roelof; Bouic, Patrick J.D.; Henkel, Ralf
    Obesity appears to be associated with male reproductive dysfunction and infertility, although this has been inconsistent and inconclusive. Insulin and leptin are known mediators and modulators of the hypothalamus-pituitary-testes axis, contributing to the regulation of male reproductive potential and overall wellbeing. These hormones are also present in semen influencing sperm functions. Although abdominal obesity is closely associated with insulin resistance (hyperinsulinaemia), hyperleptinaemia and glucose dysfunction, changes in seminal plasma concentrations of insulin, leptin and glucose in obese males has not previously been investigated.