Nickel oxide nanoparticles exposure as a risk factor for male infertility: "In vitro" effects on porcine pre-pubertal Sertoli cells.

Lately, nickel oxide nanoparticles (NiO NPs) have been employed in different industrial and biomedical fields. Several studies have reported that NiO NPs may affect the development of reproductive organs inducing oxidative stress and, resulting in male infertility. We investigated the in vitro effects of NiO NPs on porcine pre-pubertal Sertoli cells (SCs) which undergone acute (24 h) and chronic (from 1 up to 3 weeks) exposure at two subtoxic doses of NiO NPs of 1 µg/ml and 5 µg/ml. After NiO NPs exposure we performed the following analysis: (a) SCs morphological analysis (Light Microscopy); (b) ROS production and oxidative DNA damage, gene expression of antioxidant enzymes (c) SCs functionality (AMH, inhibin B Real-time PCR analysis and ELISA test); (d) apoptosis (WB analysis); (e) pro-inflammatory cytokines (Real-time PCR analysis), and (f) MAPK kinase signaling pathway (WB analysis). We found that the SCs exposed to both subtoxic doses of NiO NPs didn't sustain substantial morphological changes. NiO NPs exposure, at each concentration, reported a marked increase of intracellular ROS at the third week of treatment and DNA damage at all exposure times. We demonstrated, un up-regulation of SOD and HO-1 gene expression, at both concentrations tested. The both subtoxic doses of NiO NPs detected a down-regulation of AMH and inhibin B gene expression and secreted proteins. Only the 5 µg/ml dose induced the activation of caspase-3 at the third week. At the two subtoxic doses of NiO NPs a clear pro-inflammatory response was resulted in an up-regulation of TNF-α and IL-6 in terms of mRNA. Finally, an increased phosphorylation ratio of p-ERK1/2, p-38 and p-AKT was observed up to the third week, at both concentrations. Our results show the negative impact of subtoxic doses NiO NPs chronic exposure on porcine SCs functionality and viability.

Zinc restores functionality in porcine prepubertal Sertoli cells exposed to subtoxic cadmium concentration via regulating the Nrf2 signaling pathway.

Introduction: Among substances released into the environment by anthropogenic activities, the heavy metal cadmium (Cd) is known to induce severe testicular injury causing male subfertility/infertility. Zinc (Zn) is another heavy metal that, unlike Cd, is physiologically present in the testis, being essential for spermatogenesis. We aimed to examine the possibility that 50 µM ZnCl2 could counteract the toxic effects induced by Cd in an in vitro model of porcine prepubertal Sertoli cells (SCs) exposed to both subtoxic (5 µM) and toxic (10 µM) concentrations of CdCl2 for 48 h. Materials and Methods: Apoptosis, cell cycle, and cell functionality were assessed. The gene expression of Nrf2 and its downstream antioxidant enzymes, ERK1/2, and AKT kinase signaling pathways were evaluated. Materials and Results: We found that Zn, in co-treatment with subtoxic and toxic Cd concentration, increased the number of metabolically active SCs compared to Cd exposure alone but restored SC functionality only in co-treatment with subtoxic Cd concentration with respect to subtoxic Cd alone. Exposure of Cd disrupted cell cycle in SCs, and Zn co-treatment was not able to counteract this effect. Cd alone induced SC death through apoptosis and necrosis in a dose-dependent manner, and co-treatment with Zn increased the pro-apoptotic effect of Cd. Subtoxic and toxic Cd exposures activated the Nrf2 signaling pathway by increasing gene expression of Nrf2 and its downstream genes (SOD, HO-1, and GSHPx). Zn co-treatment with subtoxic Cd attenuated upregulation on the Nrf2 system, while with toxic Cd, the effect was more erratic. Studying ERK1/2 and AKT pathways as a target, we found that the phosphorylation ratio of p-ERK1/2 and p-AKT was upregulated by both subtoxic and toxic Cd exposure alone and in co-treatment with Zn. Discussion: Our results suggest that Zn could counteract Cd effects by increasing the number of metabolically active SCs, fully or partially restoring their functionality by modulating Nrf2, ERK1/2, and AKT pathways. Our SC model could be useful to study the effects of early Cd exposure on immature testis, evaluating the possible protective effects of Zn.

Melatonin modulates Nrf2 activity to protect porcine pre-pubertal Sertoli cells from the abnormal H2 O2 generation and reductive stress effects of cadmium.

Melatonin (MLT) is a cytoprotective agent holding potential to prevent cadmium (Cd) toxicity and its impact in testicular function and fertility. In this study, we explored such potential in porcine pre-pubertal Sertoli cells (SCs). Cd toxicity resulted in impaired SC viability and function, abnormal cellular H2 O2 generation and efflux, and induction of reductive stress by the upregulation of Nrf2 expression and activity, cystine uptake and glutathione biosynthesis, glutathione-S-transferase P (GSTP) expression, and protein glutathionylation inhibition. Cd toxicity also stimulated the activity of cellular kinases (MAPK-ERK1/2 and Akt) and NFkB transcription factor, and cJun expression was increased. MLT produced a potent cytoprotective effect when co-administered with Cd to SCs; its efficacy and the molecular mechanism behind its cytoprotective function varied according to Cd concentrations. However, a significant restoration of cell viability and function, and of H2 O2 levels, was observed both at 5 and 10 µM Cd. Mechanistically, these effects of MLT were associated with a significant reduction of the Cd-induced activation of Nrf2 and GSTP expression at all Cd concentrations. CAT and MAPK-ERK1/2 activity upregulation was associated with these effects at 5 µM Cd, whereas glutathione biosynthesis and efflux were involved at 10 µM Cd together with an increased expression of the cystine transporter xCT, of cJun and Akt and NFkB activity. MLT protects SCs from Cd toxicity reducing its H2 O2 generation and reductive stress effects. A reduced activity of Nrf2 and the modulation of other molecular players of MLT signaling, provide a mechanistic rational for the cytoprotective effect of this molecule in SCs.

Effect of EPA on Neonatal Pig Sertoli Cells "In Vitro": A Possible Treatment to Help Maintain Fertility in Pre-Pubertal Boys Undergoing Treatment With Gonado-Toxic Therapies.

The incidence of cancer in pre-pubertal boys has significantly increased and, it has been recognized that the gonado-toxic effect of the cancer treatments may lead to infertility. Here, we have evaluated the effects on porcine neonatal Sertoli cells (SCs) of three commonly used chemotherapy drugs; cisplatin, 4-Hydroperoxycyclophosphamide and doxorubicin. All three drugs induced a statistical reduction of 5-hydroxymethylcytosine in comparison with the control group, performed by Immunofluorescence Analysis. The gene and protein expression levels of GDNF, were significantly down-regulated after treatment to all three chemotherapy drugs comparison with the control group. Specifically, differences in the mRNA levels of GDNF were: 0,8200 ± 0,0440, 0,6400 ± 0,0140, 0,4400 ± 0,0130 fold change at 0.33, 1.66, and 3.33µM cisplatin concentrations, respectively (**p < 0.01 at 0.33 and 1.66 µM vs SCs and ***p < 0.001 at 3.33µM vs SCs); 0,6000 ± 0,0340, 0,4200 ± 0,0130 fold change at 50 and 100 µM of 4-Hydroperoxycyclophosphamide concentrations, respectively (**p < 0.01 at both these concentrations vs SCs); 0,7000 ± 0,0340, 0,6200 ± 0,0240, 0,4000 ± 0,0230 fold change at 0.1, 0.2 and 1 µM doxorubicin concentrations, respectively (**p < 0.01 at 0.1 and 0.2 µM vs SCs and ***p < 0.001 at 1 µM vs SCs). Differences in the protein expression levels of GDNF were: 0,7400 ± 0,0340, 0,2000 ± 0,0240, 0,0400 ± 0,0230 A.U. at 0.33, 1.66, and 3.33µM cisplatin concentrations, respectively (**p < 0.01 at both these concentrations vs SCs); 0,7300 ± 0,0340, 0,4000 ± 0,0130 A.U. at 50 and 100 µM of 4- Hydroperoxycyclophosphamide concentrations, respectively (**p < 0.01 at both these concentrations vs SCs); 0,6200 ± 0,0340, 0,4000 ± 0,0240, 0,3800 ± 0,0230 A.U. at 0.l, 0.2 and 1 µM doxorubicin concentrations, respectively (**p < 0.01 at 0.1 and 0.2 µM vs SCs and ***p < 0.001 at 1 µM vs SCs). Furthermore, we have demonstrated the protective effect of eicosapentaenoic acid on SCs only at the highest concentration of cisplatin, resulting in an increase in both gene and protein expression levels of GDNF (1,3400 ± 0,0280 fold change; **p < 0.01 vs SCs); and of AMH and inhibin B that were significantly recovered with values comparable to the control group. Results from this study, offers the opportunity to develop future therapeutic strategies for male fertility management, especially in pre-pubertal boys.

"In vitro" Effect of Different Follicle-Stimulating Hormone Preparations on Sertoli Cells: Toward a Personalized Treatment for Male Infertility.

Follicle-stimulating hormone (FSH), a major regulator of spermatogenesis, has a crucial function in the development and function of the testis and it is extensively given as a fertility treatment to stimulate spermatogenesis. We analyzed the effects of different FSH preparations (α-follitropin, ß-follitropin, and urofollitropin) in combination with testosterone on porcine pre-pubertal Sertoli cells. To study the effect of the different FSH treatments in the Sertoli cell function we performed Real Time PCR analysis of AMH, inhibin B, and FSH-r, an ELISA assay for AMH and inhibin B, and a high-throughput comparative proteomic analysis. We verified that all three preparations induced a reduction of AMH in terms of mRNA and secreted proteins, and an increase of inhibin B in terms of mRNA in all the FSH formulations, while solely α-follitropin produced an increase of secreted inhibin B in the culture medium. Comparative proteomic analysis of the three FSH preparations identified 46 proteins, 11 up-regulated and 2 down-regulated. Surprisingly, the combination of testosterone with ß-follitropin specifically induced an up-regulation of eight specific secreted proteins. Our study, showing that the three different FSH preparations induce different effects, could offer the opportunity to shed light inside new applications to a personalized reproductive medicine.

Effects of nicotine on porcine pre-pupertal sertoli cells: An in vitro study.

Smoke components, such as nicotine and its major metabolites, cross the blood-testis barrier and are detectable in the seminal plasma of both active smokers and individuals exposed to cigarette smoke. In vivo studies in a rat model have further demonstrated that nicotine exposure reduces the weight of the testis, as well as the number of spermatocytes and spermatids, and affects the ultrastructure of Sertoli cells (SC) - which serve as sentinels of spermatogenesis - causing intense germ cell sloughing in the tubular lumen that compromises offspring fertility. This study sought to determine the effects of nicotine on the viability and function of purified pig pre-pubertal SC. Nicotine exposure reduced the mRNA expression and protein levels of anti-Mullerian hormone (AMH) and inhibin B and impaired FSH-r sensitivity via the downregulation of FSH-r and aromatase gene expression compared to untreated SC. Overall, our study suggests that nicotine can significantly alter extracellular matrix and tight junction protein gene expression (e.g., laminin, integrin, and occludin), thus compromising cross-talk between the interstitial and tubular compartments and enhancing blood-testis barrier (BTB) permeability via downregulation of the mitogen-activated protein kinase (MAPK) pathway. These findings further elucidate a potential mechanism of action underlying nicotine exposure's detrimental effects on SC function in vivo.

Acute effects of lead on porcine neonatal Sertoli cells in vitro.

Environmental pollution is one of the main factors responsible for reducing fertility in males. Lead is one of the major heavy metal contaminants that impairs several organs; it preferentially accumulates in male reproductive organs and alters sperm quality both in vivo and in vitro. However, the underlying mechanisms remain unclear. Sertoli cells (SCs) provide structural and physiological support to spermatogenic cells within seminiferous tubules. Therefore, changes in SCs affect the developing germ cells and alter spermatogenesis. This study aimed to assess whether exposure to subtoxic doses of adversely affects SC functioning in higher mammals. Purified and functional porcine neonatal SCs were exposed to lead acetate at three different concentrations. Lead exposure decreased the mRNA expression and protein levels of inhibin B and anti-Mullerian hormone (AMH) compared to control, indicating loss of FSH-r integrity in terms of 17-ß-oestradiol production under FSH stimulation. In addition, we observed an increase in the mRNA levels of Akt and mTOR, and the phosphorylation of p38 and Akt in SCs exposed to lead at all concentrations compared to unexposed control SCs. In conclusion, lead is toxic to SCs, even at low concentrations, and is expected to alter spermatogenesis.

Xenograft of microencapsulated Sertoli cells restores glucose homeostasis in db/db mice with spontaneous diabetes mellitus.

BACKGROUND: Increased abdominal fat and chronic inflammation in the expanded adipose tissue of obesity contribute to the development of insulin resistance and type 2 diabetes mellitus (T2D). The emerging immunoregulatory and anti-inflammatory properties of Sertoli cells have prompted their application to experimental models of autoimmune/inflammatory disorders, including diabetes. The main goal of this work was to verify whether transplantation of microencapsulated prepubertal porcine Sertoli cells (MC-SC) in the subcutaneous abdominal fat depot of spontaneously diabetic and obese db/db mice (homozygous for the diabetes spontaneous mutation [Leprdb ]) would: (i) improve glucose homeostasis and (ii) modulate local and systemic immune response and adipokines profiles. METHODS: Porcine prepubertal Sertoli cells were isolated, according to previously established methods and enveloped in Barium alginate microcapsules by a mono air-jet device. MC-SC were then injected in the subcutaneous abdominal fat depot of db/db mice. RESULTS: We have preliminarily shown that graft of MC-SC restored glucose homeostasis, with normalization of glycated hemoglobin values with improvement of the intraperitoneal glucose tolerance test in 60% of the treated animals. These results were associated with consistent increase, in the adipose tissue, of uncoupling protein 1 expression, regulatory B cells, anti-inflammatory macrophages and a concomitant decrease of proinflammatory macrophages. Furthermore, the treated animals showed a reduction in inducible NOS and proinflammatory molecules and a significant increase in an anti-inflammatory cytokine such as IL-10 along with concomitant rise of circulating adiponectin levels. The anti-hyperglycemic graft effects also emerged from an increased expression of GLUT-4, in conjunction with downregulation of GLUT-2, in skeletal muscle and liver, respectively. CONCLUSIONS: Preliminarily, xenograft of MC-SC holds promises for an effective cell therapy approach for treatment of experimental T2D.

Long-term stability, functional competence, and safety of microencapsulated specific pathogen-free neonatal porcine Sertoli cells: a potential product for cell transplant therapy.

BACKGROUND: Porcine Sertoli cells (pSCs) have been employed for cell therapy in pre-clinical studies for several chronic/immune diseases as they deliver molecules associated with trophic and anti-inflammatory effects. To be employed for human xenografts, pSCs products need to comply with safety and stability. To fulfill such requirements, we employed a microencapsulation technology to increase pre-transplant storage stability of specific pathogen-free pSCs (SPF-pSCs) and evaluated the in vivo long-term viability and safety of grafts. METHODS: Specific pathogen free neonatal pigs underwent testis excision under sterility. pSCs were isolated, characterized by immunofluorescence (IF) and cytofluorimetric analysis (CA) and examined in terms of viability and function [namely, production of anti-müllerian hormone (AMH), inhibin B, and transforming growth factor beta-1 (TFGß-1)]. After microencapsulation in barium alginate microcapsules (Ba-MC), long-term SPF-pSCs (Ba-MCpSCs) viability and barium concentrations were evaluated at 1, 24 throughout 40 h to establish pre-transplant storage conditions. RESULTS: The purity of isolated pSCs was about 95% with negligible contaminating cells. Cultured pSCs monolayers, both prior to and after microencapsulation, maintained high function and full viability up to 24 h of storage. At 40 h post-encapsulation, pSCs viability decreased to 80%. Barium concentration in Ba-MCpSCs lagged below the normal maximum daily allowance and was stable for 4 months in mice with no evident side effects. CONCLUSIONS: Such results suggest that this protocol for the isolation and microencapsulation of pSCs is compatible with long-haul transportation and that Ba-MCpSCs could be potentially employable for xenotransplantation.

Progressive decline of residual follicle pool after clinical diagnosis of autoimmune ovarian insufficiency.

CONTEXT: In approximately 5-8% patients with primary ovarian insufficiency (POI), the disease is caused by an autoimmune process made evident by the appearance of autoantibodies against steroidogenic enzymes (SCA-POI). Anti-müllerian hormone (AMH) is the best marker of the residual follicular pool. OBJECTIVE: To evaluate the rate of loss of the residual follicle pool in women with SCA-POI after clinical diagnosis. DESIGN AND METHODS: One hundred and thirty-two women with POI were tested for 21-hydroxylase autoantibodies, 17α-hydroxylase autoantibodies and P450scc autoantibodies, and 35 patients with SCA-POI were identified. AMH was analysed at the time of the first visit in all women with POI, and in follow-up, serum samples were taken 1-3 years after in 11 women with SCA-POI and detectable AMH. RESULTS: 12/35 (35%) women with SCA-POI had AMH levels within the normal range at the time of first sampling, as compared to 6/97 (6%) with idiopathic POI (P < 0·001). 11/17 (65%) women with SCA-POI with <6 years disease duration had normal serum AMH concentration. A progressive decline in AMH concentration was observed at longitudinal follow-up in all 11 AMH-positive women with SCA-POI, at an estimated average rate of 1·6 µg/l AMH/year (corresponding to an average 57% of preserved follicle pool/previous year) (R(2)  = 0·219, P = 0·028). After 6 years of disease duration, only 1/18 (6%) women with SCA-POI had detectable levels of AMH, similar to women with idiopathic POI (5/78, 6%). CONCLUSION: Most women with SCA-POI present at clinical diagnosis with a preserved follicle pool that is progressively lost within a few years.

Correlation between age and Chromogranin A determination in prostate diseases.

INTRODUCTION: Serum levels of Chromogranin A (CgA) were measured in consecutive patients with prostate diseases in order to evaluate the impact of age on CgA diagnostic significance. MATERIALS AND METHODS: Serum levels of CgA were determinated in 217 consecutive patients immediately before prostate biopsy: CgA differences between cases (prostate cancer PC) and control (benign prostatic hyperplasia BPH) were analyzed, and CgA performance in prediction of PC was compared with age and standard diagnostic tools. CgA values were also analyzed in patients affected by PC, and compared with age and standard prognostic parameters. RESULTS: At multivariate analysis, CgA approaches a statistically significant value as independent predictor of PC and positively correlates with age. In PC group, CgA positively correlates with age, while no correlations are found with PSA, Gleason score or stage of disease. CONCLUSIONS: Age, correlating with CgA values in overall population and in PC subgroup, emerged as a confounding factor in CgA determination. Serum CgA has not been demonstrated as a diagnostic marker of PC being only a marker of neuroendocrine differentiation. Cga values did not correlate with other clinical prognostic factors, except age, in untreated-naive PC.

Dehydroepiandrosterone, 17alpha-hydroxyprogesterone and aldosterone responses to the low-dose (1 micro g) ACTH test in subjects with preclinical adrenal autoimmunity.

OBJECTIVE: The appearance of 21-hydroxylase autoantibodies (21OHAbs) identifies subjects with preclinical adrenal insufficiency. In 21OHAb-positive subjects, the adrenocortical function is best evaluated by peak cortisol (F) levels after the low-dose (1 micro g) ACTH stimulation test (LDT). No information is currently available on the correlation between F and other adrenocortical hormone responses to the LDT in subjects with an ongoing autoimmune adrenal process. In this study, we tested the hypothesis that the dehydroepiandrosterone (DHEA), 17alpha-hydroxyprogesterone (17OHP) and aldosterone (A) responses to the LDT are consensual to that of F during the preclinical phase of autoimmune adrenal insufficiency. DESIGN AND PATIENTS: We studied 12 subjects positive for 21OHAb, in the absence of clinical signs of adrenal insufficiency. On the basis of peak F levels after the LDT, and according to the lower level of normal observed in 15 healthy volunteers (510.4 nmol/l), patients were subdivided into two groups: group A, n = 6 subjects with normal F response; and group B, n = 6 subjects with impaired F response. Results were expressed as absolute delta increase (Delta) between peak and basal levels. RESULTS: DeltaF was significantly higher in group A (314.5 +/- 115.8 nmol/l) than in group B (151.7 +/- 88.2 nmol/l) (P = 0.041). DeltaDHEA and Delta17OHP were also significantly higher in group A (17.0 +/- 13.5 nmol/l and 6.1 +/- 4.4 nmol/l, respectively) than in group B (0.69 +/- 2.25 nmol/l and 1.9 +/- 1.7 nmol/l, respectively) (P = 0.002 and P = 0.041). The difference in DeltaA between the two groups did not reach statistical significance (group A 321.8 +/- 272.0 pmol/l vs. group B 157.0 +/- 154.0 pmol/l). DeltaDHEA, Delta17OHP and DeltaA tended to correlate positively with DeltaF (P = 0.039, P = 0.039 and P = 0.044, respectively), but the correlations did not reach significance after correction of the P-value. CONCLUSIONS: Our study demonstrates a high concordance between F and DHEA, 17OHP and A responses to the LDT in subjects with preclinical adrenal autoimmunity, thus strengthening the concept that the LDT is an accurate test to identify early adrenal dysfunction.