Scipedia: Collection of Articles on Biochemistry, Genetics and Molecular Biology

The Effect of Rocoto Pepper at Varying Concentrations on Parkinson’s Disease in C. elegans Models

Albjona Zhuka — Fri, 13 Mar 2026 17:29:33 +0100

The increasing incidence of Parkinson’s disease (PD) represents a significant public health challenge, highlighting the urgent need for more accessible and innovative treatments. Rocoto pepper (Capsicum pubescens), a South American chili pepper, has a unique composition of capsaicin, dihydrocapsaicin, antioxidants, and vitamins A and C. While previous studies have investigated the neuroprotective properties of several pepper species, the effects of Rocoto pepper on PD remain largely unexplored. The present study examines the effects of Rocoto pepper extract at varying concentrations on Parkinson’s disease using Caenorhabditis elegans (C. elegans) as a model organism. C. elegans were exposed to four different concentrations of Rocoto extract (0%, 4%, 8% and 16%) applied onto the surface of Nematode Growth Medium (NGM) and fed E. coli OP50. Over the course of one week, behavioral assays were conducted to monitor locomotion and touch sensitivity. By exploring an overlooked yet culturally rich crop, this study calls attention to a broader and more inclusive approach in the search for sustainable medical solutions. Future research would test the individual compounds found in the pepper to determine which component has the greatest neuroprotective effects and the mechanisms it underwent in dopaminergic pathways. Expanding the range of tested concentrations, increasing the sample size, and replicating trials would strengthen the reliability of the findings.

The Effects of Pomegranate Juice on C. elegans under Thermal Stress

Armaanjit Singh — Mon, 21 Jul 2025 20:30:43 +0200

This experiment analyzed the effects of pomegranate juice on C. elegans under thermal stress. C. elegans, a nematode with similar genes to humans, is an effective model for studying human diseases. Thermal stress occurs when an organism is exposed to high temperatures, which results in the release of heat shock proteins. Heat shock proteins act as molecular chaperones that help restore protein homeostasis following heat stress. Despite their presence, thermal stress can still weaken antioxidant defense in organisms. However, pomegranate juice is rich in antioxidants and polyphenols, which can help strengthen antioxidant defense. In this study, pomegranate extract was dissolved in water and mixed with agar powder. Using this pomegranate mixed agar, E. coli was cultured for 24 hours. The results showed that the 5 mg/ml concentration increased survival rates of C. elegans. However, the 10 and 20 mg/ml concentrations lowered survival rates, which can be attributed to dose-dependent toxicity. Interestingly, the higher concentrations of pomegranate extract significantly increased C. elegans reproductive rates. This research expands on previous studies that examined the effect of pomegranate juice on C. elegans and distinctly focuses on its role under thermal stress. This distinction helps gain a deeper insight into pomegranate juice's effect on oxidative stress.

Caffeine and sleep: Molecular and electrophysiological characteristics

Laura Ximena Castaño Loaiza — Sat, 01 Jun 2019 05:54:02 +0200

Caffeine is one of the most consumed stimulants in the world, being available in beverages such as coffee, chocolate, tea and energizers. It is a molecule used at the pharmacological level as an analgesic and causes psychostimulant effects related to decreased sleepiness, increased attention, modulation of memory and cognitive performance; In addition, it is recognized for the improvement of sports performance, among others (1).

The relationship between sleep and caffeine has been widely investigated, it has been established that this methylxanthine can prolong sleep latency, generate less total sleep time with decreased deep sleep and a parallel increase in light sleep (2).

Then, a review is presented that addresses the effect of caffeine on the polysomnographic stages of sleep and on the biological interactions that this substance presents in the adenosine receptors to which it joins; In addition, the genetic variations of these receptors will be taken into account, as possible causes of the changes induced by caffeine in sleep.

Molecular mechanisms associated with azole resistance in Candida species

Marcela Orjuela Rodríguez — Fri, 31 May 2019 11:16:04 +0200

Opportunistic fungi of the Candida species have been associated with a broad spectrum of human infections with significant morbidity and mortality rates, ranging from superficial skin infections to deep or disseminated candidiasis. To combat this microorganism, antifungals are used, substances capable of specifically attacking fungi. Among them, the most commonly used are azoles, molecules characterized by an azole ring with various substituents, however, there has been widespread resistance to this type of antifungal agents. The objective of this review is to describe the main mechanisms of resistance to azole antifungals in fungal species of the genus Candida.