Many female reproductive disorders observed during adulthood originate from the neonatal period, which is a critical stage toward the reproductive potency. Human and animal fertility are determined by the pool of primordial follicles that are established during fetal or neonatal life. The earliest stages of follicle development are under control of a variety of factors, including sex steroids. Neonatal period is a “critical developmental window” in which organisms are susceptible to the environmental chemicals that may affect the reproductive health. Endocrine active compounds (EACs) are found abundantly in the environment and interfere with sex steroids (predominantly androgens and estrogens) by either mimicking or blocking their functions. This review covers the current knowledge about the effects of selected EACs with androgenic (testosterone propionate), anti-androgenic (flutamide), estrogenic (diethylstilbestrol, bisphenol A, 4-tert-octylphenol, phtalates and genistein), anti-estrogenic (ICI 182,780 and parabens), or mixed activity (methoxychlor) on the ovary of neonates, focusing on their effects on the early stages of folliculogenesis. These chemicals have been shown to affect oocyte survival, follicle formation, and growth, as well as steroidogenic functions. The better cognition of mechanisms underlying the long-term consequences of the neonatal EACs exposure may in future lead to an understanding of human health risks and developing prevention strategies.
- endocrine active compounds
- neonatal window
Considerable evidence demonstrates that inappropriate steroid exposure during pre- and postnatal developmental periods may have long-term effects on the adult reproductive functions . Female fertility is determined by the pool of primordial follicles within the ovary that is established during fetal or neonatal life. The earliest stages of follicle development are tightly coordinated by numerous factors, including steroids. Importantly, these fetal/neonatal periods are “critical developmental windows” in which organisms are susceptible to the environmental chemicals that may affect ovarian formation and disturb reproductive functions during adulthood, including conception rates, maintenance of pregnancy, and reproductive disorders . Endocrine active compounds (EACs) comprise a wide variety of synthetic or natural chemicals found in the environment arising from anthropogenic, industrial, agricultural, and domestic sources. EACs may interfere with the natural regulation of endocrine system by either mimicking or blocking the function of endogenous hormones and also they may act directly on gene expression by means of epigenetic modifications . This is of concern because women are exposed to EACs on a daily basis, and some EACs are known to target the ovary and cause reproductive health problems. However, the harmful effects of EACs during neonatal period may occur with exposure to much lower doses than those considered harmful to adults . Although many disrupting chemicals are excluded from the everyday use since their dangerous properties have been described, they may persist in the environment for long periods of time. Furthermore, new products with similar properties are still introduced to the market. Therefore, these compounds have currently been one of the greatest concerns all over the world. To assess the effect of EACs on human ovarian and consequently reproductive functions, the animal models are extensively used in experimental studies.
In this chapter, we aim to point out a possible impact of androgens/estrogens excess or deficiency on neonatal ovary following EACs action. The effect of EACs with androgenic (testosterone propionate), anti-androgenic (flutamide), estrogenic (diethylstilbestrol, bisphenol A, 4-tert-octylphenol, phtalates and genistein), anti-estrogenic (ICI 182,780 and parabens), or mixed activity (methoxychlor) will be discussed.
2. Mechanism of steroids action
The action of androgens/estrogens, and their agonists or antagonists, depends on the presence of specific receptors in target cells. The types of receptors that are involved in the signal transduction decide on the signaling pathway. The effect of sex steroid hormones action within the cell may be genomic or nongenomic. A genomic response is usually induced by nuclear/cytoplasmic receptors, while nongenomic pathway is activated by membrane receptors, mostly G-protein-coupled receptor. It is now evident that there is crosstalk between nongenomic and genomic signaling pathways .
Steroid hormone receptors, which belong to the superfamily of nuclear receptors, are hormone-activated transcriptional factors. They are modular proteins consisting of C-terminal ligand-binding domain (LBD), highly conserved DNA-binding domain (DBD) with centrally located zinc fingers, and N-terminal domain . Activation of these receptors is mediated by two transcriptional activating domains, AF-1 and AF-2. AF-1, characterized by a ligand-independent transcriptional activation, is localized in the N-terminal region of the receptor, while AF-2, activated by ligands, is localized within the LBD. The LBD and DBD of nuclear receptors are conserved regions, whereas the N-terminal domain is highly variable but important for full transcriptional activity . The latter contains many sites for Ser/Thr phosphorylation, which may be involved in mediating cross-talk with other signaling pathways leading to modulation of AF-1 activity and interaction with coregulators .
Sex steroid hormones can freely diffuse across the plasma membrane and bind to their cognate receptors inducing dissociation from the heat-shock proteins. Ligand binding to LBD region causes conformational changes followed by the dimerization of receptors and its translocation into the nucleus. The dimer binds to the hormone response elements (HREs) typically located in the promoter of the target gene and leads to the recruitment of coregulators, either coactivators or corepressors . However, some nuclear receptors (i.e., estrogen receptors, and ERs) are capable of binding to DNA sequence, lacking the classic HRE sequence. Such receptors associate with the components of the AP-1 transcription factor complex (i.e., c-Jun and c-Fos). Additionally, in the low steroids concentration, the ligand-independent signaling pathway occurs allowing the activation of receptors. This process depends on the growth factor receptors and involves MAPK/ERKs pathway, which enhances transcriptional activity through direct phosphorylation of steroid receptors . These pathways are known as “genomic pathway” and are characterized by the regulation of the expression of specific sex steroid receptor-regulated genes .
Although steroids exert most of their biologic activity through direct or indirect genomic effects, there are several examples that do not fit to this regulatory scheme. This pathway known as “nongenomic” is much more rapid and involves receptors localized in the plasma membrane or in “lipid rafts” . All sex steroid hormones may stimulate rapid effects in signal transduction pathway through the production of second messengers, ion channels transport, and protein kinase cascades. Rapid effects of androgens and estrogens have been reported in many cell types [13, 14]. Conventional steroid receptors located in the membrane trigger the signal transduction cascade by activation of the Src/Ras/Raf/MAPK/ERK1/2 pathway . Furthermore, steroids may mediate rapid signaling by binding to transmembrane receptors unrelated to nuclear hormone receptors (usually, G protein-coupled receptor, GPCR) and to the modified forms of steroid receptor or to receptors for neurotransmitters. The involvement of the type of receptor may depend on the steroid and cell type . GPCR activates a protein kinase cascade or acts at the level of secondary messengers such as PI3K/AKT/mTOR, PI3K/AKT/cAMP/Ca+2 or ERK-mediated pathways like PI3K/AKT/MAPK-ERK/Elk1 . Among GPCR, there are GPR30 for estradiol, mPR for progesterone, and GPRC6A and ZIP9 for androgens [18, 19, 20, 21]. All the abovementioned mechanisms of steroid action are presented in Figure 1.
3. The role of androgens and estrogens in the ovarian development
Primordial follicle assembly and the primordial-to-primary follicle transition are the major developmental events within the ovary . The primordial follicle pool represents the total population of germ cells available during reproductive life and, therefore, determines the fertility potential of the female. In mammals, mitosis of oogonia and initiation of meiotic prophase I occur before birth, but the timing of oocyte meiotic arrest, follicle formation, and the initiation of follicle growth varies among species. During fetal ovarian development, primordial germ cells (PGSs) migrate from the endoderm of the yolk sac to the bipotential genital ridges. In mice (reviewed in Ref. ), which is a valuable animal model for studying embryogenesis, PGSs migrate into the undifferentiated gonad from around 8.5 day
In contrast, in humans, ruminants, and pigs, follicle formation and the initiation of follicular growth are much less synchronous than in rodents and take place during fetal life. Although cattle and human have similar gestation lengths, follicle assembly in cattle was observed earlier (around 80 dpc) than in human (112–133 dpc). Besides, in bovine ovaries, the first primary and secondary follicles were observed around 140 and 210 dpc, respectively. No secondary follicles were observed in the fetal human ovary . In pig, primordial follicle formation was observed between 70 and 90 dpc, while primordial to primary follicle transition was between 90 dpc and postnatal day 1 . Interestingly, even antral follicles were present before birth in the sheep ovaries .
The early stages of folliculogenesis are believed to be gonadotropins-independent. All events related to early follicular development during fetal/neonatal period are mostly regulated by paracrine growth factors originating from the growing oocyte itself and from the somatic cells that surround it , and also by ovarian steroid hormones (i.e., progesterone, androgens, and estrogens). Although the pivotal role of androgens in the development of male reproductive organs is well understood, growing evidence supports the direct involvement of these hormones in female reproduction, including early follicular development . The androgen receptor (AR) role in the female is implicated from the studies of various global and tissue-specific AR knockout (ARKO) mouse models. Granulosa cell-specific ARKO (GCARKO) mouse models have demonstrated that granulosa cells are important sites for androgen action and strongly suggested that the AR in these cells is an important regulator of androgen-mediated follicular growth and development. On the other hand, AR inactivation in the oocyte, as shown in the OoARKO female mouse model, appears to have no major overall effect on female fertility . Fowler et al.  reported that the oocyte of the primordial follicles was able to synthesize androgens and that pregranulosa cells expressed AR in human fetal ovaries. Initiation of primordial follicle growth was stimulated in mouse, bovine, and primates ovaries by testosterone and dihydrotestosterone [37, 38, 39], while in sheep by dehydroepiandrosterone . In general, androgens stimulate the primordial-to-primary follicle transition but impede the later stages of follicle development.
Studies using ERα knockout (αERKO) mice have demonstrated that the lack of ERα does not appear to affect folliculogenesis until the preantral stage of follicle development . Similarly, in ERβ knockout (βERKO) mice, 17β-estradiol (E2) does not appear to be essential for the establishment of germ cell number or ovarian development . However, Kezele and Skinner  have shown that both progesterone (P4) and E2 inhibit oocyte nest breakdown. It has been shown that fetal ovarian P4 and E2 concentrations decreased during the time as follicle assembly was initiated in the bovine ovary, while the maternal blood P4 and E2 levels were stable . Recent work by Dutta et al.  also revealed that fetal mice produce their own steroid hormones to coordinate primordial follicle development. Notably, E2 promotes primordial follicle formation in hamster . These data indicate that both P4 and E2 are important regulators of ovarian follicle assembly. Furthermore, E2 is likely to inhibit primordial-to-primary follicle transition, which was revealed in neonatal rat ovaries [43, 47]. In contrast, the lack of E2 in aromatase knockout (ArKO) mice was associated with decreased numbers of primordial and primary follicles . Similarly, the primordial follicles number was reduced in estrogen-depleted fetal baboon ovaries . These results indicate that although E2 is needed for early events in folliculogenesis, its excessive level inhibits these events. Abnormal control of primordial follicle assembly may affect the reproductive potential of the female and can lead to pathological conditions such as premature ovarian failure.
4. Effects of endocrine active compounds within the neonatal ovary
Many female reproductive disorders observed during adulthood originate from the neonatal period, which is a critical stage toward the reproductive potency. Consequently, it is important to study the effects of neonatal exposure to chemicals that mimic or antagonize the effects of estrogens and androgens to establish their role in ovarian function. Recent attention has been especially focused on environmental factors interfering with endogenous steroids action. There are synthetic and natural environmental compounds such as pesticides (i.e., dichlorodiphenyltrichloroethane (DDT); methoxychlor (MXC), vinclozolin, and atrazine); detergents and surfactants (4-tert-octylphenol, nonylphenol, and bisphenol A); plastics (phtalates); industrial compounds (polychlorinated biphenyl, PCB; 2,3,7,8-tetrachlorodibenzo-p-dioxin, TCDD); and fitoestrogens (genistein and coumestol) . In the light of growing body of evidence that demonstrates the presence of EACs in the environment, understanding the mechanism of selected EACs action within neonatal ovaries provides a basic data for further research of the female reproductive potency. The susceptibility of target tissues is related to the stage of development, the exposure dose, and the individual immune status. Mammals are more sensitive to EACs during fetal and postnatal life than in adulthood. However, environmental influence during fetal and neonatal development may lead to adult onset pathology.
4.1. EACs with androgenic and anti-androgenic properties
Previous data on primates clearly showed the essential role of androgens in promoting early follicular growth . These results were confirmed by
Studies on sheep [51, 52] and primates  have shown that excess of androgens in fetal life resulted in reduced ovarian functions in adult life and may provide models for polycystic ovary syndrome (PCOS) in women. Research by Tyndall et al.  was undertaken to investigate the effects of different windows of testosterone propionate treatment during fetal or neonatal life in female rats to determine whether and when excess androgen exposure would cause disruption of adult reproductive functions. The findings from fetal exposure to testosterone propionate suggested the possibility of reducing the sensitivity threshold to neonatal androgens exposure in female animals. The results support the concept that androgen programming of adult female reproductive function occurs only during specific time windows in fetal and neonatal life with implications for the development of PCOS in women.
Neonatal androgenization by testosterone propionate induced early misprogramming of ovarian functions in the female rats . The obtained results strongly suggested that transient neonatal hyperandrogenemia led to ovarian dysfunctions marked by altered steroidogenesis and folliculogenesis. Exposure to testosterone propionate resulted in the increase of primary and the decrease of antral follicle frequencies. Moreover, the higher proportion of atretic follicles and the lack of corpora lutea within the ovaries from testosterone propionate-treated rats were observed. Another research on rats revealed that exposure to excess of testosterone in neonatal period increased the LH and testosterone serum levels, the LH/FSH ratio, ovarian theca-interstitial area and expression of steroidogenesis-involved genes, and Lhr and Cyp17a1 in ovaries of adult animals . These results provide some insight into the role of androgens on reproductive development and on the manifestations of clinical disorders such as PCOS.
Among EACs, there is a large group of chemicals exerting anti-androgenic effects and blocking endogenous androgens action. In our previous experiments, the androgen involvement in early stages of folliculogenesis was confirmed using
In our recent research, flutamide (50 mg/kg body weight) was injected into pregnant gilts during gestational days 20–28 and 80–88 and into female piglets on postnatal days 2–10. We have found ovarian morphological changes indicating delayed folliculogenesis in neonatal pigs exposed
It seems that disturbed androgen action during gestational and neonatal periods by using flutamide led to reprogramming of the trajectory of ovarian development in pigs; however, neonatal window of exposure leads to long-term effects observed in adulthood.
4.2. EACs with estrogenic and anti-estrogenic properties
Compounds that mimic estrogens action through an interaction with ERs continue to receive considerable attention. One of them is 4-tert-octylphenol, which belongs to alkylphenol polyethoxylates derivative, which is a nonionic surfactant widely used in a variety of industrial applications . It was demonstrated that pre- or postnatal exposure to 4-tert-octylphenol can advance the onset of puberty in rats  and pigs . In addition, in a three-generation study, 4-tert-octylphenol given prenatally to sows induced some effects, including reduction in litter size, observed in the next generations . Furthermore, 4-tert-octylphenol exposure during fetal and postnatal life accelerated the onset of puberty but did not disrupt FSH concentration and the dynamic of ovarian follicular growth in ewes . On the other hand, research on rats revealed that neonatal administration to 4-tert-octylphenol altered hypothalamo-pituitary-ovarian axis resulting in atrophic and polycystic ovaries without corpora lutea . In our most recent experiments using neonatal pigs treated with 4-tert-octylphenol, the advanced folliculogenesis has been shown. We assumed that these specific effects on folliculogenesis in neonatal pigs were characterized by changes in proliferation and apoptosis rates during initial follicular recruitment .
Both bisphenol A and diethylstilbestrol are another of the extensively studied EACs with estrogenic activity. Bisphenol A is a plasticizer used commonly in a wide range of consumer products such as food and drink containers, epoxy resins, plastics, baby bottles, thermal receipts, and dental sealants (reviewed in Ref. ). Zhou et al.  revealed that bisphenol A exposure significantly inhibited germ cell nests breakdown by altering the expression of key ovarian apoptotic genes in cultured neonatal mouse ovaries. Interestingly, exposure of neonates to estrogenic compounds like bisphenol A significantly increases the number of multiple oocyte follicles (MOFs) in adult mice ovaries. It was proposed that neonatal exposure to exogenous estrogens blocked cysts breakdown resulting in oocytes survival . Apart from abovementioned influence of bisphenol A on oocyte nests, additional effects on the follicle development were found. Bisphenol A may interact with multiple factors produced by oocyte and granulosa cells to alter neonatal follicular dynamics. [73, 74]. It was shown that this compound reduced the primordial follicle pool by stimulating the initial recruitment in neonatal rats associated with an increased proliferation rate, which is likely mediated by an estrogenic pathway . It could also decrease follicle activation in neonatal mice . Additionally, the effect of neonatal exposure to bisphenol A on the reproductive axis was observed in adult rats, which may lead to the development of PCOS .
Diethylstilbestrol is a synthetic nonsteroidal estrogen. Studies on neonatal rodents injected with diethylstilbestrol demonstrated results similar to those of bisphenol A. Neonatal exposure to diethylstilbestrol of mice and hamster inhibited germ cell nest breakdown and induced MOFs formation, likely by interfering with the ERβ pathway and inhibiting programmed oocyte death and germ cell loss [78, 79]. Rodríguez et al.  used a relatively low concentration of diethylstilbestrol (20 μg/kg body weight) in the rat and found that primordial follicle activation was increased compared to studies of Karavan et al.  on mice, where the higher diethylstilbestrol concentration (100 μg/kg body weight) decreased the follicle activation. Both diethylstilbestrol and bisphenol A reduced follicle growth and development, resulting in the presence of more primordial follicles and fewer primary and secondary follicles in mouse neonatal ovary . In prepubertal lambs treated with bisphenol A or diethylstilbestrol during neonatal period, the reduction of the primordial follicle pool and increased atresia was observed. That was surprising since nest breakdown in sheep is completed before birth. However, it seems that the reduction of the primordial follicle pool is due to stimulation of their initial recruitment and subsequent development until antral stage. These alterations may affect the ovarian function in the adulthood .
Genistein is a natural phytoestrogen with estrogenic activity found in soy products. The belief that estrogens can regulate nest breakdown is supported by a study of Jefferson et al. . They have demonstrated exposure of neonatal mice to genistein, which inhibited the oocyte nests breakdown and increased oocyte survival. Moreover, ovaries from adult mice treated as neonates with genistein have an increased occurrence of MOFs, suggesting incomplete nests breakdown . This indicates that cell survival/death pathways are altered following neonatal genistein treatment. The inhibition of oogonia/oocyte nests breakdown by EACs action was shown in the Figure 2.
Phthalates are commonly used as plasticizers in the manufacturing of flexible polyvinyl chloride products. Little information is available on the effects of phthalates on neonatal ovary. These compounds have been actually shown to affect germ cell nest breakdown and primordial follicle assembly in cultured newborn mouse ovaries . In addition, early postnatal treatment with diethylhexyl phthalate accelerated folliculogenesis by decreasing the number of primordial follicles and increasing the number preantral and antral follicles in mice . The decrease in primordial follicle pool indicated estrogenic action of these compounds.
ICI 182,780 is a widely used anti-estrogen that can bind to both ERα and ERβ with very high affinity and completely antagonize the effect of estrogens . It was found that ICI 182,780 in combination with estradiol allowed oocytes cyst breakdown neonatal rat ovaries . On the other hand, Wang and Roy  revealed that ICI 182,780 significantly increased apoptosis and caused a modest reduction in primordial follicle formation in neonatal hamster ovary. Likewise, ICI 182,780 accelerated primordial follicles formation from oocyte nests in the neonatal pig. However, the initial follicle recruitment marked by the number of growing was delayed .
The compounds that exert both estrogenic and anti-estrogenic properties are parabens, which are widely used as anti-microbial agents in the cosmetic and pharmaceutical industries. Parabens inhibited the early phase of folliculogenesis and steroidogenesis in the ovaries of neonatal rats . Moreover, it appears that parabens through inhibition of transcriptional repressor Foxl2, regulated the levels of steroidogenic enzymes .
4.3. EACs with mixed properties
Methoxychlor (MXC) is an organochlorine pesticide metabolized predominantly to 1,1,1-trichloro-2-(4-hydroxyphenyl)-2-(4-methoxyphenyl) ethane (MOH) and the bisphenolic compound 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl) ethane (HPTE) in the organism . MXC along with its metabolites acts through ERs and possesses estrogenic, anti-estrogenic, and anti-androgenic activities depending on the receptor subtype . In a variety of experimental studies, MXC administration in early pregnancy or during the prenatal and neonatal periods has been shown to cause adverse abnormalities in adulthood of female rats, such as reduced ovarian functions and ovulatory rates, as well as pregnancy outcome . Uzumcu et al.  demonstrated that MXC administration during the primordial-to-primary follicle transition period in mice (postnatal days 3–10) inhibited follicular development and reduced antral follicle numbers. In addition, MXC treatment increased the level of AMH protein production, which in turn inhibited folliculogenesis within the ovary. Another research suggested that exposure to MXC during fetal and neonatal ovarian development led to adult ovarian dysfunction, including an increase in the number of preantral and early antral follicles and a reduced number of corpora lutea and female infertility in rats . Furthermore, there are several reports suggesting the role of MXC in the induction of epigenetic modifications within the ovary. Rats exposed to MXC (20 or 100 μg/kg body weight) between embryonic day 19 and postnatal day 7 revealed altered methylation pattern in the promoter region of ERα that suppressed the ERα expression and caused ovarian dysfunction. Developmental exposure to MXC led to significant hypermethylation in the ERβ promoter regions, whereas the ERα promoter was unaffected .
The plausible link between EACs exposure during critical periods of early development and risk of chronic diseases in adulthood, including premature ovarian failure and PCOS, has been reported. The harmful effects of compounds with androgenic, anti-androgenic, estrogenic, and anti-estrogenic activities during neonatal window may occur with exposure to lower doses than those harmful for adults. These chemicals have been shown to target the ovary of neonates and adversely affect oocyte survival, follicle formation, and growth, as well as steroidogenic functions. There is a concern over EACs due to their common use and persistence within the modern living environment. The better cognition of mechanisms underlying the long-term consequences of the neonatal EACs exposure may in future lead to an understanding of human health risks and developing prevention strategies.
This work was supported by National Science Center, Poland, grant no. 2015/17/B/NZ9/01457 (to MS).
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