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Environmental Anti-Androgens and Male Reproductive Health: Focus on Phthalates and Testicular Dysgenesis Syndrome

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Environmental Anti-Androgens and Male Reproductive Health: Focus on Phthalates and Testicular Dysgenesis Syndrome REPRODUCTIONREVIEW Environmental anti-androgens and male reproductive health: focus on phthalates and testicular dysgenesis syndrome Jane S Fisher The University of London, School of Pharmacy, Department of Toxicology, 29–39 Brunswick Square, London, WC1N 1AX, UK Correspondence should be addressed to Jane S Fisher; Email: jane.fi[email protected] Abstract The amount of research into endocrine disruption has exploded over the past decade and a re-evaluation of the state of research in this area is timely. There are debates about whether human male reproductive health is really declining and whether endocrine disrupting chemicals play any role in the perceived decline. Most data currently conclude that there are wide geographical variations in semen quality and in the incidence of testicular cancer, cryptorchidism and hypospadias. This review aims to give a brief overview of the issues surrounding the perceived decline in human male reproductive health and the importance of the hormonal environment for the development of the testis and reproductive tract. The consequences for the male reproductive tract of abnormal androgen levels or action are discussed with reference to environmental anti-andro- genic compounds. The in vivo data on several anti-androgenic compounds that have been administered to pregnant rodents during the period of male reproductive tract development are assessed with attention to the effects on the male offspring. Finally, the data on in utero phthalate administration are discussed in detail to illustrate the similarities between the effects of some phthalate esters and the human male reproductive tract disorders which comprise testicular dysgenesis syndrome (TDS). Reproduction (2004) 127 305–315 Introduction hormone (FSH)) from the gonadotroph cells in the pituitary gland. LH and FSH travel through the systemic The phrase ‘endocrine disruption’ has seemingly become circulation and act on the endocrine active cells of gonad inextricably linked with terms like ‘environmental oestro- (testis or ovary). Within the testis, the Leydig cells secrete gens’ and ‘falling sperm counts’. While these connections testosterone and oestradiol and the Sertoli cells secrete aid understanding about these issues, they represent a simplified view of the field of endocrine disruption. An inhibin B. These gonadal signals feedback to the pituitary ‘endocrine disruptor’ is anything (not just an environmen- and hypothalamus to regulate the release of GnRH and tal chemical) which can cause an imbalance within the the gonadotrophins (IPCS 2002). There is the potential for endocrine system. The endocrine system is not only con- endocrine disrupting chemicals (EDCs) to act at any level cerned with the reproductive tract, but with all the hor- of the HPG axis but there is general support for the view mone-producing organs/glands which maintain bodily that the development and programming of the axis during homeostasis (e.g. thyroid, parathyroids, anterior and pos- fetal life could be the most sensitive window to perma- terior pituitary, pancreas, adrenals, pineal, and the gonads nently alter the homeostatic mechanisms of the endocrine (IPCS 2002). system (IPCS 2002). The endocrine system can be regarded as a number of There is currently no strong data to suggest that environ- interconnecting and interacting axes. The major regulator mental EDCs are responsible for the observed degener- of the mature reproductive system is the hypothalamo– ation in human male reproductive health, but there are pituitary–gonadal (HPG) axis that functions as a classical secular trends to suggest that it is declining. There is, how- negative feedback system. This consists of the gonado- ever, very good evidence that lifestyle factors (e.g. smok- trophin-releasing hormone (GnRH) neurons in the ing and/or alcohol consumption) can have an impact on hypothalamus (brain) that release GnRH into the portal fertility (Sharpe & Franks 2002). Similarly, the notion that blood supply. GnRH stimulates the release of gonado- all EDCs act by mimicking oestrogen (environmental oes- trophins (luteinising hormone (LH) and follicle-stimulating trogens) is too simplistic. The current literature illustrates q 2004 Society for Reproduction and Fertility DOI: 10.1530/rep.1.00025 ISSN 1470–1626 (paper) 1741–7899 (online) Online version via www.reproduction-online.org Downloaded from Bioscientifica.com at 09/29/2021 10:06:22PM via free access 306 J S Fisher that EDCs can act as oestrogens, anti-oestrogens, anti- been employed. These and other issues lead to uncertainty androgens, steroidogenic enzyme inhibitors and can also over the quality of the data and, therefore, doubt over act via interaction with the thyroid hormones and their the conclusions. To overcome these issues, large scale, receptors, or within the brain and the hypothalamo–pitu- multinational, prospective studies, using standardised itary axis, as well as the immune system (Amaral Mendes methodologies are ongoing. Initial results from prospective 2002). Current thinking suggests that chemicals that inter- European studies have shown regional differences fere with steroid action/production may be of more con- in semen quality between Copenhagen, Denmark; cern to reproductive health. Two examples of this are the Paris, France; Edinburgh, Scotland; and Turku, Finland. effects of tributyltin (TBT) on marine gastropod popu- The median sperm concentrations were 61 £ 106/ml, lations and the effects of phthalates on laboratory animals. 74 £ 106/ml, 77 £ 106/ml and 82 £ 106/ml respectively TBT was used in antifouling paints applied to boat hulls. It (Jorgensen et al. 2001). Recent studies published from the was subsequently linked to the appearance of ‘imposex’ USA, which have used identical methodologies to the (the growth of a penis and vas deferens in the female) in European-based studies, have also reported geographical marine snails (Bryan et al. 1986). In female gastropods the differences in semen quality (Swan et al. 2003a). The growth of the male sex organs can be stimulated by testos- mean sperm count was significantly lower in Columbia, terone, and studies have illustrated that TBT increases tes- Missouri (58.7 £ 106/ml) when compared with New York, tosterone levels by inhibiting the enzyme aromatase New York (102.9 £ 106/ml); Minneapolis, Minnesota which converts testosterone to oestradiol (IPCS 2002). (98.6 £ 106/ml); or Los Angeles, California (80 £ 106/ml) Certain phthalate esters (ubiquitously used chemicals in (Swan et al. 2003a). Swan et al. (2003b) also compared manufacturing) have recently been shown to disrupt male the levels of urinary metabolites of several pesticides cur- reproductive tract organogenesis when administered to rently used in agriculture in men from Missouri (rural rats during pregnancy. One mechanism by which this area) and Minnesota (urban area), and found an increase occurs is via a large reduction in fetal testosterone syn- in pesticide levels in the samples from Missouri (Swan thesis and subsequently androgen levels (Mylchreest et al. et al. 2003b). A statistical correlation between poor semen 1999, Parks et al. 2000). This reduction in testosterone quality and high levels of alachlor, diazinon, atrazine, levels has consequences for the virilization of the male metolachlor and 2,4-D (2,4-dichlorophenoxyacetic acid) reproductive tract and will be described in more detail was observed which suggest that pesticide residues may later. Although there are cases where single agents have be a factor in the observed decrease in semen quality been shown to be the causative chemical (e.g. TBT), it is observed between rural and urban areas in the USA (Swan also important to consider that we are not exposed to et al. 2003a). single agents in the environment but to a complex mixture In general, the reasons for these wide geographical vari- of substances. There is currently no real understanding of ations in semen quality are not understood, but over time, what the effects of exposure to this mixture are, or the data from ongoing prospective studies will provide a whether it poses a real risk to human health. This review resource to establish whether a decreasing trend in sperm will focus on environmental chemicals that have the counts exists. However, a more relevant question is ‘what potential to affect androgen synthesis or action, in particu- is the biological consequence of a reduction in semen lar phthalates, and will make an effort to link the experi- quality?’ A recent study of young Danish men attending mental data to issues concerning male reproductive medical examinations for compulsory military service health concerns. between 1996–1998, found a high proportion to have sub- optimal semen quality (Andersen et al. 2000). The mean sperm concentration was 57.4 £ 106/ml. However, 48% of Problems with male reproductive health men had sperm concentrations below 40 £ 106/ml and 25% of men had sperm counts ,20 £ 106/ml. These cut- Semen quality offs are relevant as sperm concentrations below Carlsen et al. (1992) published a provocative study which 40 £ 106/ml have been associated with decreased fecund- suggested that human semen quality had declined by ity and an increased time to pregnancy (Bonde et al. 1998), ,50% from 1930 to 1991. Many subsequent studies criti- whereas sperm concentrations below 20 £ 106/ml are con- cized or re-analysed the original meta-analysis but the sidered abnormal according to World Health Organization trends and conclusions have been reaffirmed (Swan et al. guidelines
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