Ultraviolet-B radiation induces transcriptional modulation of components associated with the extracellular matrix in embryos of decapod Macrobrachium olfersii

• Published in: Aquatic toxicology Vol. 222; p. 105468
• Main Authors: dos Santos, Thiciane Patrycia Gonçalves, de Melo, Madson Silveira, Schramm, Heloisa, Müller, Yara Maria Rauh, Jaramillo, Michael L.B., Nazari, Evelise Maria
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.05.2020
• Subjects: Crustacea; ECM genes; Embryonic development; Transcript levels; UVB radiation; Transcript levels; Crustacea; Embryonic development; ECM genes; UVB radiation
• ISSN: 0166-445X; 1879-1514
• DOI: 10.1016/j.aquatox.2020.105468

[Display omitted] •The transcriptional levels of components associated with the ECM were modulated during embryonic development.•Col4α1, Itgβ, Mmp1 and Timp were overexpressed after UVB exposure.•UVB disrupted the normal expression of components associated with the ECM.•Col4α1, Itgβ, Lamα, Mmp1 and Timp gene sequences of M. olfersii were similar to other Decapoda species.•The Itgβ and Mmp1 transcript levels were the more reliable biomarkers for the assessment of the UVB exposure. The extracellular matrix (ECM) is a non-cellular and three-dimensional structure, constituted by a macromolecular dynamic network that involves the cells in all animal tissues, including embryonic ones. Several studies with vertebrates and cell cultures have reported deleterious effects of ultraviolet-B (UVB) radiation on the components associated with the ECM. However, studies focusing on the UVB radiation effects on ECM components of crustaceans during embryonic development are very scarce. Thus, the aim of this study was to identify the coding sequences of components associated with the ECM and to evaluate the effect of UVB radiation on embryos of the ecologically-important decapod Macrobrachium olfersii. To evaluate the modulation of these ECM components during embryonic development, the transcript levels of Col4α1, Itgβ, Lamα, Mmp1 and Timp in M. olfersii embryos were analyzed at early developmental stages (E1, E3 and E4), intermediate developmental stage (E7) and late developmental stages (E10 and E14). In addition, embryos at E7, which correspond to a landmark of crustacean development, were analyzed after 12 h of UVB exposure to verify UVB effects on the ECM components. The ECM component sequences were similar to other decapods, suggesting conservation of these genes among crustaceans. The results showed modulations of the ECM components of M. olfersii embryos that reflect the need for each component in the cellular mechanisms, necessary for normal embryonic development. After UVB exposure, embryos showed opacity of embryonic tissues and it was found the overexpression of Col4α1, Itgβ, Mmp1 and Timp transcript levels (1.82-, 1.52-, 2.34- and 6.27-fold, respectively). These impairments can compromise important events for normal embryonic development, such as growth of optic lobes, caudal papilla, ramification of appendages and differentiation of organic systems. The results presented here, together with the effects on morphology, cell proliferation, differentiation, and apoptosis demonstrated previously, strengthen the knowledge of the complex impacts of UVB radiation on freshwater embryos. Nevertheless, our results encourage further investigations focusing on the assessment of UVB effects on different organisms in order to better understand the myriad of UVB effects on ECM components.