Daily Cosmetic Research Analysis

BACKGROUND: Sesquiterpene ( +)-valencene is a characteristic aroma component from sweet orange fruit, which has a variety of biological activities and is widely used in industrial manufacturing of food, beverage and cosmetics industries. However, at present, the content in plant sources is low, and its yield and quality would be influenced by weather and land, which limit the supply of ( +)-valencene. The rapid development of synthetic biology has accelerated the construction of microbial cell factories and provided an effective alternative method for the production of natural products. RESULTS: In this study, we first introduced the ( +)-valencene synthase into Komagataella phaffii by CRISPR/Cas9 system, and successfully constructed a ( +)-valencene producer with the initial yield of 2.1 mg/L. Subsequently, the ( +)-valencene yield was increased to 8.2 mg/L by fusing farnesyl pyrophosphate synthase with ( +)-valencene synthase using the selected ligation linker. High expression of key genes IDI1, tHMG1, ERG12 and ERG19 enhanced metabolic flux of MVA pathway, and the yield of ( +)-valencene was further increased by 27%. Besides, in-situ deletion of the promoter of ERG9 increased the yield of ( +)-valencene to 48.1 mg/L. Finally, we optimized the copy number of farnesyl pyrophosphate synthase and ( +)-valencene synthase fusion protein, and when the copy number reached three, the yield of ( +)-valencene achieved 173.6 mg/L in shake flask level, which was 82-fold higher than that of the starting strain CaVAL1. CONCLUSIONS: The results obtained here suggest that K. phaffii has the potential to efficiently synthesize other terpenoids.

INTRODUCTION: Rib resection and remodeling have gained attention as cosmetic procedures to enhance body contours, particularly waist-to-hip ratio. Historically, rib resection has been used for medical reasons; however, plastic surgeons have recently adopted it for aesthetic purposes. However, concerns remain regarding the safety and effectiveness of the procedure, particularly due to the potential for complications, such as pneumothorax, chronic pain, and impaired respiratory function. This systematic review aimed to assess the existing evidence on rib resection or remodeling for body contouring. METHODS: A systematic review was conducted following PRISMA guidelines. Databases including PubMed, EMBASE, Cochrane, and others were searched for studies involving rib resection or remodeling for aesthetic purposes. Studies were selected based on predefined inclusion criteria, including adult patients and outcomes related to waist circumference reduction, adverse events, and patient satisfaction. Risk of bias was assessed using the ROBINS-I tool. RESULTS: This review included 12 studies that revealed variability in techniques, patient selection, and outcomes. Rib resection was associated with significant risks such as pneumothorax and chronic pain; however, newer rib remodeling techniques, such as green-stick fractures and rib shaving, showed fewer complications. Despite promising results in some cases, the lack of long-term studies and randomized clinical trials limits the ability to draw definitive conclusions regarding the efficacy and safety of these procedures. CONCLUSION: Rib remodeling appears to offer a less invasive alternative to full-rib resection, with a reduced risk of complications. However, the current literature is insufficient to provide conclusive evidence regarding the long-term safety and efficacy of these procedures. Further high-quality studies, including randomized trials, are needed to inform surgical practices and patient decision-making regarding rib-based body contouring. LEVEL OF EVIDENCE I: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

BACKGROUND: There is no definitive solution for the treatment of striae distensae (SD), and effectiveness of each treatment method remains controversial. We aimed to investigate and compare the efficacy of the combination of Erbium YAG (Er:YAG) laser and stromal vascular fraction (SVF), the combination of Er:YAG laser and platelet-rich plasma (PRP) and Er:YAG laser plus saline in the treatment of SD. MATERIALS AND METHODS: In 12 participating patients with at least three lesions (36 lesions in total), each lesion was treated with an Er:YAG laser. SVF was randomly injected intradermally for the first lesion, PRP for the second lesion, and normal saline as placebo for the third lesion. Treatment duration was one session, and the safety and efficacy of the treatment was assessed 3 months later using the following items: evaluation of biometric parameters including corneometery, erythema, melanin, tewametery, color, cutometery, complete thickness, epidermal thickness, dermal thickness, complete density, epidermal density, and dermal density; assessment of patient and physician satisfaction using Likert score; and recording of adverse effects of treatment. RESULTS: The study involved 12 patients (evaluating 36 lesions in total), predominantly women (83%), with an average age of 39.16 years. The analysis revealed significant improvements in biometric indices, including complete thickness, epidermal thickness, dermal thickness, and R5 cutometer readings across all groups after the intervention. Notably, the SVF and PRP groups showed statistically significant enhancements in dermal and complete density compared to the placebo group. The SVF group demonstrated a significant increase in epidermal density (from 45.95 to 51.19, p = 0.001), unlike the PRP and placebo groups which showed nonsignificant changes. Comparing the average changes in biometric factors, the SVF group exhibited significantly greater increases in complete thickness, dermal thickness, complete density, epidermal density, and dermal density than the other groups. Both patient and physician satisfaction scores were highest in the SVF group (p = 0.001), with no significant posttreatment complications reported. CONCLUSION: Our results showed that the combination of Er:YAG laser and SVF injection could be considered an effective and safe treatment method in the treatment of SD. TRIAL REGISTRATION: IRCT20200127046282N14.