Light is one of the factors affecting physiological functions in living things. In the present study, reproductive functions of male rats exposed to different wavelengths of light were evaluated. For this purpose, a total of 56 male Sprague Dawley rats were used in 7 groups (n = 8 per group). Rats were exposed to light spectrum with different wavelengths for 63 days. It was observed that malondialdehyde levels were lower in the orange (2.77 ± 0.16 nmol*mL−1), red (4.27 ± 0.17 nmol*mL−1), yellow (5.14 ± 0.15 nmol*mL−1) and green (5.56 ± 0.40 nmol*mL−1) coloured light group compared to the other groups [purple (7.07 ± 0.96 nmol*mL−1), blue (7.52 ± 0.89 nmol*mL−1), white (8.59 ± 1.20 nmol*mL−1)] (P < 0.001). The lowest glutathione levels were observed in purple (86.82 ± 1.63 nmol mL−1), blue (101.25 ± 3.61 nmol*mL−1), yellow (105.44 ± 1.70 nmol*mL−1) and green (108.11 ± 0.51 nmol*mL−1) coloured groups, respectively. The lowest sperm motility percentage was found in blue (29.16 ± 11.40), purple (56.25 ± 3.36), green (62.50 ± 4.91) and white (69.58 ± 5.51) coloured light groups compared to the other groups (P < 0.001). Epididymal sperm density decreased significantly in rats exposed to purple, orange and blue light (P < 0.001). The abnormal sperm ratio was higher in the blue and white light group compared to the other groups (P < 0.001). Histological examinations showed that tubulus seminiferus contortus diameter and germinal cell thickness decreased significantly in the purple light treatment (P < 0.001). As a summary, the application of purple and blue light has negative effects on the reproductive function in rats.
Aggelopoulos, N. C. and Meissl, H. (2000): Responses of neurones of the rat suprachiasmatic nucleus to retinal illumination under photopic and scotopic conditions. J. Physiol. 523, 211–222.
Bertoni, J. M., Sprenkle, P. M. and Brainard, G. C. (1987): Effects of different light wavelengths at equal irradiance on testis weight, protein content, and K-paranitrophenylphosphatase activity in the skin hamster. Life Sci. 40, 1479–1486.
Biswas, N., Biswas, R., Biswas, N. and Mandal, L. H. (2013): Effect of continuous light on spermatogenesis and testicular steroidogenesis in rats: possible involvement of alpha 2u-globulin. Nepal. Med. Coll. J. 15, 62–64.
Biswas, N. and Sarkar, M. (1996): Protection of testicular activity by continuous light in rats treated withlithium. Med. Sci. Res. 24, 297–298.
Brainard, G. C., Vaughan, M. K. and Reiter, R. J. (1986): Effect of light irradiance and wavelength on the Syrian hamster reproductive system. Endocrinology 119, 648–654.
Chainy, G. B. and Sahoo, D. K. (2020): Hormones and oxidative stress: an overview. Free Radic. Res. 54, 1–26.
Chekani Azar, S. and Sabuncuoğlu Çoban, N. (2023): Nesfatin-1 protects the reproductive health of male Sprague Dawley rats exposed to blue and white LED lights. Sci. Rep. 13, 19962.
Constantino, D. B., Tonon, A. C., de Oliveira, M. A. B., Amando, G. R., Freitas, J. J., Xavier, N. B., Ribeiro, R. J., Idiart, M. and Hidalgo, M. P. L. (2022): Effects of lighting patterns in pubertal development and metabolism of female wistar rats. Physiol. Behav. 243, 113641.
Dauchy, R. T., Wren, M. A., Dauchy, E. M., Hoffman, A. E., Hanifin, J. P., Warfield, B., Jablonski, M. R., Brainard, G. C., Hill, S. M. and Mao, L. (2015): The influence of red light exposure at night on circadian metabolism and physiology in Sprague–Dawley rats. J. Am. Assoc. Lab. Anim. Sci. 54, 40–50.
Dedeke, G., Kehinde, F., Olatinwo, O., Johnson, O. and Adewale, A. (2017): Exposure of albino rats (Rattus norvegicus) to lights of varying wavelengths; effect on haematological profile, plasma electrolytes and weight gain. Zoologist. 15, 29–34.
Emmer, K. M., Russart, K. L., Walker II, W. H., Nelson, R. J. and DeVries, A. C. (2018): Effects of light at night on laboratory animals and research outcomes. Behav. Neurosci. 132, 302.
Erbaş, E., Gelen, V., Kara, H., Gedikli, S., Yeşildağ, A., Özkanlar, S. and Akarsu, S. A. (2024): Silver nanoparticles loaded with oleuropein reduce doxorubicin-induced testicular damage by regulating endoplasmic reticulum stress, and apoptosis. Biol. Trace Elem. Res. 202, 4687–4698.
Esashi, T., Nakamura, K., Tsuchiya, K., Tamura, Y., Shimotomai, A., Yokota, F. and Hayami, H. (1973): The effect of illumination and darkness on the birth rate of the rat. Jpn. J. Nutr. 31, 195–198.
Fox, J. G., Anderson, L. C., Otto, G. M., Pritchett-Corning, K. R. and Whary, M. T. (2015): Laboratory Animal Medicine. Elsevier, China, p. 1746.
Johnsen, S. G. (1970): Testicular biopsy score count– a method for registration of spermatogenesis in human testes: normal values and results in 335 hypogonadal males. Horm. Res. Paediatr. 1, 2–25.
Kehinde, F., Dedeke, G., Olude, M., Ademolu, K., Aladesida, A. and Adewale, A. (2023): Assessment of reproductive hormones in prepubertal and postpubertal rats (Rattus norvegicus) on chronic exposure to various spectra of artificial light at night. Zoologist 22, 31–39.
Laakso, M. -L., Porkka-Heiskanen, T., Johansson, G., Peder, M. and Nikanne, E. (1987): Spectral properties of light affect plasma and pituitary gonadotropins in male rats. Horm. Res. 27, 84–94.
Luna, L. G. (1968): Manual of Histologic Staining Methods of the Armed Forces Institute of Pathology. McGraw-Hill, New York, p. 258.
Matveeva, Y. P., Zhukova, O., Lotosh, T., Yunash, V., Bukalev, A. and Vinogradova, I. (2019): The role of constant light exposure in various periods of postnatal ontogenesis in the development of pathology and mortality in male rats. Adv. Geront. 9, 141–146.
Milosevic, V., Trifunovic, S., Sekulic, M., Sosic-Jurjevic, B., Filipovic, B., Negic, N., Nestorovic, N., Manojlovic Stojanoski, M. and Starcevic, V. (2005): Chronic exposure to constant light affects morphology and secretion of adrenal zona fasciculata cells in female rats. Gen. Physiol. Biophys. 24, 299.
Moska, N., Murray, E., Wakefield, P. and Matson, P. (2011): The staining pattern of human sperm with Diff Quik, relationship with sperm head morphology and a sperm chromatin structure assay (SCSA). Reprod. Biol. 11, 55–59.
Ortega, H., Lorente, J., Mira, G., Baravalle, C. and Salvetti, N. (2004): Constant light exposure causes dissociation in gonadotrophin secretion and inhibits partially neuroendocrine differentiation of Leydig cells in adult rats. Reprod. Domest. Anim. 39, 417–423.
Ömür, A. D., Sevim, Ç., Sağlam, Y. S., Bolat, İ., Genç, S., Yeni, Y., Aydın, M. A., Sunar, S., Koçak, G. and Akarsu, S. A. (2024): Investigation of the subchronic effects of low-dose pesticide mixture on rat testes. Jpn. J. Vet. Res. 71, 82–94.
Placer, Z. A., Cushman, L. L. and Johnson, B. C. (1966): Estimation of product of lipid peroxidation (malonyl dialdehyde) in biochemical systems. Anal. Biochem. 16, 359–364.
Sarıözkan, S., Türk, G., Eken, A., Bayram, L. Ç., Baldemir, A. and Doğan, G. (2017): Gilaburu (Viburnum opulus L.) fruit extract alleviates testis and sperm damages induced by taxane-based chemotherapeutics. Biomed. Pharmacother. 95, 1284–1294.
Sedlak, J. and Lindsay, R. H. (1968): Estimation of total, protein-bound, and nonprotein sulfhydryl groups in tissue with Ellman's reagent. Anal. Biochem. 25, 192–205.
Şentürk, E., Üstündağ, H., Aygül, İ. and Şentürk, M. (2023): Effect of white noise and light exposure on some enzymes in rat testicular tissue. Gümüşhane Univ. J. Health Sci. 12, 889–894.
Şimşek, H., Gür, C., Küçükler, S., İleritürk, M., Akaras, N., Öz, M. and Kandemir, F. M. (2023): Carvacrol reduces mercuric chloride-induced testicular toxicity by regulating oxidative stress, inflammation, apoptosis, autophagy, and histopathological changes. Biol. Trace Elem. Res. 202, 4605–4617.
Trasci, N., Baykalir, Y. and Simsek, U. G. (2023): The effects of different light spectrum on some oxidative stress parameters in male and female rats. GSC Biol. Pharm. Sci. 25, 123–128.
Tuncer, S. Ç., Akarsu, S. A., Küçükler, S., Gür, C. and Kandemir, F. M. (2023): Effects of sinapic acid on lead acetate - induced oxidative stress, apoptosis and inflammation in testicular tissue. Environ. Toxicol. 38, 2656–2667.
Tuncer, S. Ç., Gur, S., Kucukler, C., Akarsu, S. A. and Kandemir, F. M. (2024): Effects of zingerone on rat induced testicular toxicity by sodium arsenite via oxidative stress, endoplasmic reticulum stress, inflammation, apoptosis, and autophagy pathways. Iran J. Basic Med. Sci. 27, 603–610.
Türk, G., Ateşşahin, A., Sönmez, M., Çeribaşi, A. O. and Yüce, A. (2008): Improvement of cisplatin-induced injuries to sperm quality, the oxidant-antioxidant system, and the histologic structure of the rat testis by ellagic acid. Fertil. Steril. 89, 1474–1481.
Türk, G., Ateşşahin, A., Sönmez, M., Yüce, A. and Çeribaşi, A. O. (2007): Lycopene protects against cyclosporine A-induced testicular toxicity in rats. Theriogenology 67, 778–785.
Zou, Y., Peng, Z., Wang, W., Liang, S., Song, C., Wang, L., Wu, Z., Wu, Q., Tan, X. and You, F. (2022): The stimulation effects of green light on the growth, testicular development and stress of olive flounder Paralichthys olivaceus. Aquaculture. 546, 737275.