The influence of retinol concentration in liquid crystal formula on epidermal growth factor, interleukin-6 and transglutaminase-1 mRNA expression in the epidermis

Topical retinol application effectively reduces the effects of photoaging and improves skin condition, e.g. influences the process of keratinization of the epidermis, which improves stratum corneum structure and reduces transepidermal water loss. However, cosmetics use lower concentrations of retinol, which has been associated with emerging hypersensitivity reactions as well as redness and irritation of the skin. The question arises whether the vehicle used in the cosmetic may be important in stimulating the inflammatory reaction in the skin and if the concentration of retinol used could significantly affects the growth of epidermal cells. The aim of this study was to evaluate the effects of different concentrations of liquid crystal retinol (0.15%, 0.3% and 0.5%) on the clinical and histological characteristics of a reconstructed epidermis skin model. It also compares the effectiveness of 0.3% retinol formula in liquid crystal to that in lipid. The study used reconstructed human epidermis tissue containing normal human keratinocytes. Four original formulas containing retinol were tested: 0.15%, 0.3% and 0.5% with a liquid crystal base, and 0.3% with a lipid base. Interleukin 6 (IL-6), transglutaminase-1 (TGM1), and epidermal growth factor (EGF) mRNA expression was measured expression of the skin-equivalent tissue for 10 days of exposure. Histopathological analysis and mRNA quantification were performed. Gene expression was analyzed by total mRNA extraction. All liquid crystal formulas induced higher EGF mRNA expression than lipid base formula. IL-6 expression did not differ significantly from the DPBS reference values. Interestingly, TGM1 expression was found to increase together with increasing retinol concentration (0.15%, 0.3%, 0.5%). Histological examination revealed changes in epidermal structure, mainly hyperkeratinization of the stratum corneum. Our results support the hypothesis liquid crystal formula might be regarded as more beneficial since it inducess less pro-inflammatory action manifested by lowered expression IL-6. In addition, EGF expression was found to correlate significantly with the retinol concentration of the liquid crystal formula: 0.5% > 0.3% > 0.15% (P < 0.05). Lower concentrations may increase TGM1 expression, thus enhancing the formation of a protective layer of cornified envelope.

Correlation Between Magnetic Resonance Imaging Findings and Advanced Practice Physiotherapists' Assessment Findings in Diagnosing Lumbosacral Radiculopathy, and the Impact of Imaging Findings on Treatment Plans: A Retrospective Clinical Audit

BACKGROUND

Magnetic Resonance Imaging (MRI) is increasingly used by Advanced Practice Physiotherapists (APPs) to confirm the diagnosis of lumbosacral radiculopathy (LSR) and to exclude other spinal pathologies. There is evidence of correlation between Advanced Practice Physiotherapists' diagnosis of lumbosacral radiculopathy and positive MRI findings, but there is limited evidence regarding the correlation between the full physiotherapy assessment and MRI findings. There are also conflicting evidence regarding the effect of MRI findings on treatment planning post-imaging.

AIMS

This study aims to examine the extent to which Advanced Practice Physiotherapists' diagnoses of lumbosacral radiculopathy correlate with those made after MRI, and to examine Advanced Practice Physiotherapists use of the local MRI referral pathway with respect to treatment plans, including testing correlation between pre-and post-MRI treatment plans.

METHODS

A cross-sectional, multi-centre, retrospective audit was conducted on 482 patients (276 female, 206 male) referred for lumbosacral MRI between January 2018 and December 2019. Non-linear regression analysis was performed to examine the relationships between diagnosis and treatment plans in LSR before and after MRI.

RESULTS

The results show a significant positive correlation (p < 0.001; R = 0.196) between pre- and post-MRI diagnoses of lumbosacral radiculopathy. There was a significant positive correlation between pre- and post-MRI treatment plans for LSR (p = 0.001; R = 0.159). On comparison of pre- and post-MRI diagnoses of LSR, there is a weak positive correlation with high statistical significance (p < 0.001; R = 0.196). Reliability, tested using the intraclass correlation coefficient (ICC) across the four categories, was (p = 0.041; R = 0.033). This shows a weak positive correlation with statistical significance.

CONCLUSIONS

Advanced Practice Physiotherapists can confidently diagnose and treat lumbosacral radiculopathy following initial assessment, although a minority of referrals lack a clear or appropriate treatment plan.

The time-course effects of talus taping on ankle dorsiflexion range of motion

Background/Aims

Talus taping may be an effective physiotherapeutic treatment for equinus (passive dorsiflexion range of motion <10°). However, the time-course effects of this intervention are unknown. The aims of this study were to identify the effect that the application of talus tape for 48 hours during normal functional activities has on dorsiflexion range of motion, and to determine whether any changes in dorsiflexion range of motion persisted until 5 days after removal (study day 7).

Methods

A total of 16 healthy participants (mean age 28.3 ± 8 years) were recruited. Participants' were randomly assigned to control and intervention conditions. Baseline measures of dorsiflexion range of motion were taken in both ankles using the weight-bearing lunge test. The intervention ankle had talus tape applied, which remained in place for 48 hours during normal functional activities. To determine the time-course effects, dorsiflexion range of motion was reassessed in the control and intervention ankles immediately following removal of the tape (at 48 hours) and again 5 days later, on day 7.

Findings

Dorsiflexion range of motion in the taped intervention ankle increased significantly between the baseline and 48-hour measures. However, when reassessed at day 7, participants' dorsiflexion range of motion had returned to baseline levels. There were no significant differences in the control ankle across all three measures.

Conclusions

Applying talus tape for 48 hours during normal functional activities results in immediate but not long-lasting changes in dorsiflexion range of motion.