Evaluation of biomarkers of oxidative stress and female reproductive hormones in post menopausal women with breast cancer in Southern Nigeria.

BACKGROUND: Reproductive hormones and reactive oxygen species produced by either hormonal or aerobic metabolism have been implicated in carcinogenesis of the breast and disease progression. Perturbations in the homeostasis of female reproductive hormones and oxidative stress indices in breast cancer (BCa) could be used for monitoring disease prognosis. OBJECTIVES: The aim of this study was to assess levels of some biomarkers of oxidative stress and female reproductive hormones in postmenopausal women with BCa at different stages. METHODS: Reduced glutathione (GSH), total antioxidant capacity (TAC), total plasma peroxides (TPP), nitric oxide (NO), malondialdehyde (MDA), estradiol (E2), and prolactin (PRL) levels were determined in 50 post-menopausal women with BCa (stages II-IV) and 50 women without BCa (controls) by colorimetry and ELISA methods. Oxidative stress and body mass indices (OSI &BMI) and clinical history were obtained. RESULTS: Post-menopausal women with BCa had significantly higher BMI (26.60 ± 5.17 vs 22.73 ± 1.21 kg/m2, P=<0.001), TAC (5.59 ± 2.38 vs 4.43 ± 2.66 mmol/l, P = 0.023), TPP (4.92 ± 3.59 vs 2.98 ± 2.82 mmol/l, P = 0.003), NO (31.96 ± 10.73 vs 23.92 ± 6.37 µmol/l, P=<0.001) and E2 (78.89 ± 54.54 vs 11.08 ± 14.80 pg/ml, P = 0.003) levels and lower mean age at menarche (13.16 ± 0.87 vs 14.14 ± 1.60 years, P=<0.001) compared to controls. Controls had significantly lower E2 (P = 0.003), TPP (P = 0.005) and OSI (P = 0.043) compared to women with stage II BCa; lower E2 (P=<0.001), NO (P = 0.010), TAC (P = 0.010) and TPP (P=<0.001) compared to stage III BCa; and lower E2, (P=<0.001), NO (P = 0.044) and MDA (P = 0.020) compared to stage IV BCa respectively. Prolactin correlated positively with E2 (r = 0.296, P = 0.037), and TAC (r = 0.336, P = 0.011) in women with BCa. CONCLUSION: Postmenopausal women with BCa at different stages have increased estradiol, antioxidants, lipid peroxidation, and oxidative stress index suggesting that these indices may be useful for clinical assessment and monitoring progression of breast cancer.

Chlamydia Infection; Plasma Peroxidation and Obesity in Tubal Infertility

Background: Genital tract infections and obesity are both sources of oxidative stress. Alterations in immune and antioxidant parameters may arise from this or from an indeterminate autoimmune mechanism. Objective: This study aimed to investigate the association of Chlamydial infection; obesity and oxidative response with tubal infertility in Nigerian women. Methods: It was a case-control study of 40 women with tubal infertility and 32 fertile women; respectively; recruited from the Infertility and Family Planning Clinics respectively; of the University College Hospital; Ibadan; Nigeria. Anthropometric indices were measured in each subject and endocervical swabs were taken to screen for current genital tract infection. Antioxidant; hormonal and immunologic analysis were performed on serum. Results: None of the subjects had current genital tract infections. Chlamydia trachomatis IgG positivity was significantly higher in infertile than in fertile subjects [OR 4.33; 95CI (0.078-0.681)]. No significant variations were observed in the anthropometric indices; antioxidant parameters and hormones between infertile and the fertile women. Body mass index correlated positively with oxidative stress in infertile subjects. Waist and hip circumferences correlated negatively with oestradiol in women with tubal infertility. Conclusion: Chlamydial infection is associated with tubal factor infertility; however; obesity seems to increase oxidative stress and reduce fertility potential in women with tubal factor infertility

Chlamydial infection, plasma peroxidation and obesity in tubal infertility.

BACKGROUND: Genital tract infections and obesity are both sources of oxidative stress. Alterations in immune and antioxidant parameters may arise from this or from an indeterminate autoimmune mechanism. OBJECTIVE: This study aimed to investigate the association of Chlamydial infection, obesity and oxidative response with tubal infertility in Nigerian women. METHODS: It was a case-control study of 40 women with tubal infertility and 32 fertile women, respectively, recruited from the Infertility and Family Planning Clinics respectively, of the University College Hospital, Ibadan, Nigeria. Anthropometric indices were measured in each subject and endocervical swabs were taken to screen for current genital tract infection. Antioxidant, hormonal and immunologic analysis were performed on serum. RESULTS: None of the subjects had current genital tract infections. Chlamydia trachomatis IgG positivity was significantly higher in infertile than in fertile subjects [OR 4.33; 95%CI (0.078-0.681)]. No significant variations were observed in the anthropometric indices, antioxidant parameters and hormones between infertile and the fertile women. Body mass index correlated positively with oxidative stress in infertile subjects. Waist and hip circumferences correlated negatively with oestradiol in women with tubal infertility. CONCLUSION: Chlamydial infection is associated with tubal factor infertility, however, obesity seems to increase oxidative stress and reduce fertility potential in women with tubal factor infertility.