Alzheimer's disease (AD) is a neurodegenerative disorder that causes memory loss and dementia and is characterized by a decline in cognitive functions. Brain infections, especially induced by herpes simplex virus type-1 (HSV-1), are suggested to play a key role in the pathogenesis of AD. Within the scope of this study, two different AD models (Tau model and amyloid beta [Aβ]) were created in the SH-SY5Y cell line, and HSV glycoprotein B (gB) was applied to the cell line and on the generated AD models. Study groups (n = 3) were designed as (1) control, (2) HSV-gB group, (3) retinoic acid (RA) and brain derived neurotrophic factor (BDNF) induced Alzheimer's model (AD), (4) RA and BDNF induced Alzheimer's model + HSV-gB (ADH), (5) Aβ 1-42 peptide-induced Alzheimer's model (Aβ), and (6) Aβ 1-42 peptide-inducedAlzheimer's model + HSV-gB (AβH). Levels of complement proteins and cytokines were determined comparatively. In addition, specific markers of AD (hyperphosphorylated Tau proteins, Aβ 1-40 peptide and amyloid precursor protein) were measured in all groups. HSV-gB administration was found to increase Aβ and hyperphosphorylated Tau levels, similar to AD models. In addition, our data confirmed that the immune system and chronic inflammation might have a crucial role in AD development and that HSV-1 infection might also be an underlying factor of AD.
Bisphenol A (BPA), which is an abundant chemical in the environment, is suggested to cause different toxic effects, including endocrine disruption, reprotoxicity, developmental toxicity, and neurotoxicity. Due to these effects, regulatory authorities have restricted the use of BPA in different consumer products, particularly in products used by children. These restrictions have led to researchers and plastic industry to find new and safer alternatives. Today, bisphenol F (BPF) and bisphenol S (BPS) are highly used although their toxic effects are less known. In the past years, several studies showed that these derivatives might also act as endocrine disruptors and cause toxic effects. BPA is a substance that is carefully monitored by regulatory agencies, and toxicological data are evaluated regularly. The alternatives, such as BPF and BPS, should also be monitored, and the regulations concerning their use in consumer products must be implemented soon. The increase in the number of studies on BPA and different bisphenols is very important in terms of obtaining new toxicological data and guiding regulatory institutions. This chapter will mainly focus on BPA, its toxicity, BPA alternatives, and regulations implemented by different American and European authorities.
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