Ramadan S. Hussein1 | Salman Bin Dayel1 | Othman Abahussein1 | Abeer Ali El-Sherbiny2

1 Dermatology Unit, Department of Internal Medicine, College of Medicine, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia | 2 Department of Medical Laboratory, College of Applied Medical Sciences, Prince Sattam bin Abdulaziz University, Al-Kharj, Saudi Arabia

Correspondence: Ramadan S. Hussein (该Email地址已收到反垃圾邮件插件保护。要显示它您需要在浏览器中启用JavaScript。)

Received: 20 August 2024 | Revised: 27 September 2024 | Accepted: 8 November 2024

Funding: The authors received no specific funding for this work.

Keywords: biological mechanisms | environmental factors | extrinsic aging | intrinsic aging | skin aging

ABSTRACT

Background/Aim: Aging involves a progressive deterioration in physiological functions and increased disease susceptibility, impacting all organs and tissues, especially the skin. Skin aging is driven by intrinsic factors (genetics, cellular metabolism) and extrinsic factors (environment, lifestyle). Understanding these mechanisms is vital for promoting healthy aging and mitigating skin aging effects. This review aims to summarize the key factors influencing skin and intrinsic aging, providing a comprehensive understanding of the underlying mechanisms and contributing elements.

Methods: A comprehensive literature review was conducted, focusing on peer-reviewed journals, clinical studies, and scientific reviews published within the last two decades. The inclusion criteria prioritized studies that addressed intrinsic and extrinsic mechanisms of skin aging. To ensure the relevance and quality of the selected sources, a systematic approach was used to assess study design, sample size, methodology, and the significance of the findings in the context of skin aging.

Findings: The review identifies major internal factors, such as cellular senescence, genetic predisposition, telomere shortening, oxidative stress, hormonal changes, metabolic processes, and immune system decline, as pivotal contributors to intrinsic aging. External factors, including UV radiation, pollution, lifestyle choices (diet, smoking, alcohol consumption, and sleep patterns), and skincare practices, significantly influence extrinsic skin aging. The interplay between these factors accelerates aging processes, leading to various clinical manifestations like wrinkles, loss of skin elasticity, pigmentation changes, and texture alterations.

Conclusion: A comprehensive understanding of both extrinsic and intrinsic factors contributing to skin aging is essential for developing effective prevention and intervention strategies. The insights gained from this review highlight the importance of a multifaceted approach, incorporating lifestyle modifications, advanced skincare routines, and emerging therapeutic technologies, to mitigate the effects of aging and promote healthier, more resilient skin.

Marianna Blyumin-Karasik1 | Jessica Colon2 | Sylvie Nguyen2 | Jordan Rosen1

1 Precision Skin & Body Institute, Davie, Florida, USA | 2Nova Southeastern University Dr. Kiran C. Patel College of Osteopathic Medicine, Davie, Florida, USA

Correspondence: Marianna Blyumin-Karasik (该Email地址已收到反垃圾邮件插件保护。要显示它您需要在浏览器中启用JavaScript。)

Received: 13 July 2024 | Revised: 3 October 2024 | Accepted: 24 October 2024

Funding: The authors received no specific funding for this work.

Keywords: aesthetic | cosmeceuticals | healing | homeostasis | laser treatment | moisturizing serum | photoaging | skin adaptogens | skin quality | topical adaptogen

Xue Liu1 | Tamer-Whittle Hage1 | Li-Chi Chen2 | Eddy Hsi Chun Wang1 | I-Chien Liao1 | Jodi Goldberg1 | Sabina Gosto1 | Paula Cziryak1 | Maryanne Senna2 | Ying Chen1 | Qian Zheng1

1 L'Oreal Research and Innovation, Clark, New Jersey, USA | 2Harvard Medical School, Boston & Beth Israel Lahey Health, Burlington, Massachusetts, USA

Correspondence: Xue Liu (该Email地址已收到反垃圾邮件插件保护。要显示它您需要在浏览器中启用JavaScript。)

Received: 14 May 2024 | Revised: 4 October 2024 | Accepted: 18 October 2024

Keywords: anti-inflammatory | antioxidant | barrier function

Jingyi Wang | Hu Huang | Kan Tao | Lili Guo | Xincheng Hu | Huailong Chang

Global R&D Center, Shanghai Chicmax Cosmetic Co. Ltd., Global Harbor Tower B, Shanghai, China

Correspondence

Huailong Chang, Global R&D Center, Shanghai Chicmax Cosmetic Co. Ltd., Global Harbor Tower B, 3300 North Zhongshan Road, Putuo District, Shanghai 200065, China.

Email: 该Email地址已收到反垃圾邮件插件保护。要显示它您需要在浏览器中启用JavaScript。

Abstract

Background: Skin aging is one of the most abundant aging-related disorders that can be accelerated by excessive exposure to ultraviolet irradiation. Topically applied fermented skincare ingredients have gained mounting attentions due to their high concentration of various skin nourishing nutrients and bioactive components and low skin irritation potency.

Aims: In the present study, we aim to fully demonstrate the skin-related benefits of a novel extract of Thermus thermophilus and Bacillus subtilis mixed-culture ferment (TBFE).

Methods: TBFE was prepared through an innovative mixed-culture fermentation process. The contents of nutrients and bioactive ingredients were quantified by different methods accordingly. Both in vitro tests and randomized controlled human trial were utilized to further demonstrate multifaceted beneficial effects on human skin, as well as the potential mechanisms.

Results: Our results showed that TBFE upregulated the expression of type IV collagen, elastin, aquaporin-3, and dermal-epidermal junction markers, while inhibited production of melanin, in different skin cell models. Moreover, TBFE inhibited the generation of reactive oxygen species and pro-inflammatory mediators induced by ultraviolet irradiation in normal human keratinocytes, while stimulated autophagy in senescent keratinocytes. Results from clinical studies confirmed those in vitro findings, demonstrating that TBFE at 5% and 20% concentration provides anti-aging properties in subjects with sensitive skin, in terms of improving wrinkles, moisturization, and skin

Conclusions: In summary, we demonstrate that a novel mixed-culture ferment extract has promising anti-aging effects, which may be attributed to anti-oxidation, antiinflammation, and promotion of autophagy in skin cells.

KEYWORDS

anti-aging, anti-inflammation, anti-oxidation, autophagy, mixed-culture fermentation