Integridad Del ADN Espermático Y La Toxicidad Reproductiva Del Nitrato De Plomo En Ratones Machos Adultos

Introducción: La toxicidad del plomo se ha relacionado a diferentes patologías en humanos y varias evidencias sugieren una fuerte relación con el daño observado sobre la función reproductiva en humanos y roedores. Método: Se proporcionó a ratones una dosis única de nitrato de plomo (NP) (50mg/kg/pc), los cuales fueron eutanizados siete días postinyección con el objetivo de evaluar los espermatozoides que han salido de los túbulos seminíferos y están en tránsito por el epidídimo; además, se evaluó la fragmentación del ADN espermático mediante el ensayo tunel. Resultados: La disminución del peso corporal en ratones, tratados con NP (p 0,05); de igual manera, los valores fisiológicos como conteo y movilidad espermática no disminuyeron con el tratamiento (p > 0.05). El tránsito y maduración de los espermatozoides en el epidídimo no sería afectado por el NP, y al no observar aumento en la fragmentación del ADN espermático en el grupo tratado (p > 0,05), la protaminación espermática estaría cumpliendo su rol protector sobre el material genético murino, por lo que no hubo daños genotóxicos por el NP. Conclusión: La administración intraperitoneal de 50mg/kg/pc de NP, por siete días, no causa toxicidad sistémica ni efecto en la espermatogénesis en ratón.

Introduction: Lead toxicity has been linked to different diseases in humans and several evidences suggest a strong relationship with the observed damage on reproductive function in humans and rodents. Methods: Mice were given a single dose of lead nitrate (NP) (50mg/kg/bw), which were euthanized seven days post-injection with the aim of evaluating sperm to come out from the seminiferous tubules and are in transit through the epididymis. Also, the Tunel test was done to evaluate the sperm DNA fragmentation. Results: The decrease in body weight in mice treated with ln (p 0.05), in the same way physiological values such as sperm concentration and motility didn´t decrease with the treatment (p > 0.05). Transit and sperm maturation in the epididymis would not be affected by the ln, and because we did not observe increased sperm DNA fragmentation in the treated group (p > 0.05), sperm protamination would be fulfilling its protective role on murine genetic material avoiding genotoxic damage by ln. Conclusion: The intraperitoneal administration of 50mg/kg/pc of ln for seven days does not cause systemic toxicity or effect on spermatogenesis in mice.

Lead Nitrate Induced Testicular Toxicity in Diabetic and Non-Diabetic Rats: Protective Role of Sodium Selenite

Among heavy met als, lead is one of the common pollutants found in the environment and biological system. In the present study, streptozotocin-induced diabetic and normal non-diabetic male Wistar rats were given sodium selenite (1.0 mg/kg bw), lead nitrate (22.5 mg/kg bw) and sodium selenite plus lead nitrate (1.0 mg/kg+22.5 mg/kg bw, respectively) through gavage. At the end of 4th week, malondialdehyde (MDA) levels, antioxidant enzyme activities [superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione-S-transferase (GST)], and histopathological changes of testes were investigated compared to the control group. No significant differences were observed between the control and sodium selenite treated groups. However, lead nitrate increased the levels of MDA, SOD, CAT, GPx and GST activities compared with the control group in diabetic and non-diabetic rats. Light microscopic analyses revealed that lead nitrate induced numerous histopathological changes in testis tissues of diabetic and non-diabetic rats. In the diabetic and non-diabetic sodium selenite plus lead nitrate treated groups, there were statistically significantly decreased MDA levels and antioxidant enzymes activities and mild pathological changes. As a result, sodium selenite significantly reduced lead nitrate induced testicular toxicity for both diabetic and non-diabetic rats.

Protective effect of Withania somnifera roots extract on hematoserological profiles against lead nitrate-induced toxicity in mice.

The in vivo protective role of hydro-methanolic root extract of Withania somnifera (WS) was evaluated in alleviating lead nitrate (LN)-induced toxicity in male Swiss albino mice by measuring hematoserological profiles. The lead-treated (20 mg/kg body wt, p.o.) albino mice (25-30 g) concurrently received the root extract (200 and 500 mg/kg body wt, p.o.) once daily for the duration of six weeks. Animals exposed to LN showed significant (P<0.001) decline in haemoglobin content, red blood cell count, white blood cell count, packed cell volume and insignificant decrease in mean corpuscular haemoglobin and mean corpuscular haemoglobin content, while mean corpuscular volume and platelet count were increased. A significant elevation (P<0.001) in serum glutamate oxaloacetate transaminase, serum glutamate pyruvate transaminase, alkaline phosphatase, acid phosphatase and total cholesterol were also observed, when compared with control mice. Thus, the study demonstrated that the concurrent daily administration of root extract of WS protected the adverse effects of LN intoxication in mice.

In vivo evaluation of antioxidant activity of alcoholic extract of Rubia Cordifolia and its influence on lead nitrate induced damage to tissue.

To evaluate the in vivo antioxidant activity of alcoholic extract of the roots of Rubia cordifolia (RC). Male mice, were exposed, either to lead nitrate at a dose containing 40mg/kg body weight or combined with Rubia cordifolia for the first period of 40 days, where the animals were sacrificed for oxidative studies and biochemical studies. Lead has induced a significant increase in LPO, where as significant depletion SOD, CAT and GSH in liver and testis tissues. Rubia cordifolia alone had moderate effect on mice, where as coadministration of lead nitrate with Rubia cordifolia reversed the effect of lead. Ingestion of Pb (NO3)2 showed significant elevation in AST, ALT, ACP, ALP, and total cholesterol, level in tissue homogenate whereas Total protein content decreased significantly in comparison to control animals. On the other hand Alcoholic extract of Rubia cordifolia (low and high dose), along with lead nitrate decreased, elevated levels of AST, ALT, ACP, ALP, and total cholesterol, as compared to lead nitrate intoxicated mice. A significant rise in the level of total protein was also noticed. Preliminary analysis has revealed that Rubia cordifolia has significant amount of GSH, Vitamin C, other important antioxidants and polyphenols. In addition it also contains important trace elements like Zn, Cu, Vd, Se and Mo. These contribute to its antioxidant properties.

Bioaccumulation and depuration studies of lead nitrate on economically important shrimp penaeous monodon.

INTRODUCTION: Current study of Bioaccumulation and Depuration of Lead nitrate on marine shrimp Penaeous monodon shows Lead nitrate accumulation more in hepatopancreas compared to muscle and the depuration level of heavy metal Lead nitrate was more through hepatopancreas comparing to muscle tissues, when comparing to the control animals.This shows the major role of Hepatopacreas in Bioaccumulation and depuration in this study on muscle tissues and hepatopancreas tissues.

Ameliorative effect of Docosahexaenoic acid and gamma-linolenic acid on blood glucose level in lead treated Swiss albino mice during gestation and lactation.

Numbers of studies in animal models have shown changes in blood glucose level after lead administration. In the present study, ameliorative effect of Docosahexaenoic acid (DHA) and Gamma-linolenic acid (GLA) on random blood glucose level of normal and lead exposed pregnant and lactating Swiss albino mice were compared. Pregnant females were exposed to heavy metal lead orally on diet containing 4.5% lead nitrate and 4.5% lead acetate trihydrate during gestation to 3rd week of lactation. Blood glucose level was examined on 15th day of gestation and 10th day of lactation. The results indicated that in lead intoxicated pregnant females, blood glucose level increased. It can be concluded that not only lead exposure during gestation can severely affect the growth and development of pups but can also produce adverse effect on one already having increased blood glucose or diabetes. DHA and GLA showed ameliorative effect on blood glucose level in Swiss albino mice.

Protective role of coriandrum sativum (coriander) extracts against lead nitrate induced oxidative stress and tissue damage in the liver and kidney in male mice.

The present study describes antioxidant effect of Coriandrum sativum against lead nitrate induced toxicity in mice. Oxidative stress was induced in mice by a daily dose of lead nitrate (40 mg/kg body weight by oral gavage) for seven days. From day eight, after lead nitrate treatment, experimental animals received an oral dose of coriander extracts (aqueous extract - 300 mg/kg body weight and 600 mg/kg body weight; ethanolic extract - 250 mg/kg body weight and 500 mg/kg body weight) daily. The effect of these treatments in influencing the lead induced changes on hepatic and renal oxidative stress and biochemical changes along with histopathological alterations in soft tissues was studied. The data showed significant increase in liver and kidney LPO levels in animals treated with lead nitrate while the effect was attenuated by the plant extracts. Also, lead caused a significant decrease in antioxidant enzyme activity and this effect was reversed in groups treated with plant extract. Treatment with coriander significantly reduced the adverse effects related to most of biochemical parameters altered in animals treated with lead, related to hepatic and renal oxidative stress. Oral administration of Coriander to lead treated mice attenuated the deranged histopathological changes to some extent. It can be concluded from these results that Coriandrum sativum protects against lead toxicity and warrants the identification and isolation of active compounds responsible for its antioxidant effects.