Extracellular RNAs (exRNAs) are novel circulating factors that can be used as biomarkers in various diseases. Their unique and diverse kinds, as well as their role as biomarkers, make them significant biomarkers. There has been immense work carried out since the discovery of exRNAs in circulation and other biological fluids to catalog and determine whether exRNAs may be utilized as indicators for health and illness. In this review, we aim to understand the current state of exRNAs in relation to various diseases and their potential as biomarkers. We will also review current issues and challenges faced in using exRNAs, with clinical and lab trials, that can be used as viable markers for different diseases.

Reproduction is the way to immortality for an individual, and it is essential to the continuation of the species. Sirtuins are involved in cellular homeostasis, energy metabolism, apoptosis, age-related problems, and sexual reproduction. Sirtuin 1 (SIRT1) belongs to the sirtuin family of deacetylases, and it is a nicotinamide adenine dinucleotide (NAD)-dependent deacetylase. It removes the acetyl group from a variety of substrates. SIRT1 regulates endocrine/metabolic, reproductive, and placental development by deacetylating histone, different transcription factors, and signal transduction molecules in a variety of cellular processes. It also plays a very important role in the synthesis and secretion of sex hormones via regulating the hypothalamus-pituitary-gonadal (HPG) axis. Moreover, SIRT1 participates in several key stages of spermatogenesis and sperm maturation. The current review will give a thorough overview of SIRT1’s functions in male reproductive processes, thus paving the way for more research on restorative techniques and their uses in reproductive medicine.

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COVID-19, which is caused by the SARS-CoV-2 virus, is the current global pandemic. As it spreads at an exponential and precipitous rate, it causes significant organ damage, which can potentially lead to death. Although there appears to be no specific cure or resistance to this outbreak, the use and administration of Vitamin D (VD) supplements is still a viable option, as evidenced by numerous clinical trials, studies, and observations. The results of the previous investigation have revealed that people with COVID-19 had reduced levels of VD, especially those with severe and critical diseases. The arrangement of receptors such as the angiotensin-converting enzyme (ACE-II) is altered by VD. As a result, it plays an important role in immune system responses to cytokine storms and interleukins. This review aims to uncover and explain how VD might help in combating COVID-19 and possibly hold the key to minimizing its hazard in the light of currently available therapeutic strategies. Finally, we compare and contrast other researcher’s approaches to VD and COVID-19.

Collagen, a structural protein, prevalent in animals, especially in skin, bones, and joints, responsible for providing fundamental structural support, is being used extensively in cosmetics. Mammalian and fish skin are the most common sources of collagen. Collagen's unique qualities, such as its role as a natural humectant and moisturizer for the skin, have piqued the curiosity of both academics and the cosmetic industry. In this review study, collagen biosynthesis, collagen sources used in the cosmetic industry, and collagen's function in cosmetics are discussed along with future aspects of collagen-based materials in cosmetics.