The SDF-1/CXCR4 axis is involved in adipose-derived stem cell migration

BACKGROUND

Intravenous injection of adipose-derived stem cells (ADSCs) can improve the urinary function of stress urinary incontinence (SUI) model rats and C-X-C chemokine receptor type 4 (CXCR4)-positive ADSCs are found in urethral tissues. The CXCR4 ligand stromal cell-derived factor-1 (SDF-1) is highly expressed in urinary incontinence model rats. In this study, we investigated the involvement of the SDF-1/CXCR4 axis in the homing of ADSCs.

METHODS

ADSCs were isolated from rats and purified. The levels of CXCR4 and CXCR7 were determined by western blot analysis and immunofluorescence assays following stimulation with SDF-1. Hypoxia conditioning was performed to treat the cells in vitro, following which the messenger RNA (mRNA) and protein level of SDF-1, CXCR4, and CXCR7 were estimated.

RESULTS

We found that CXCR4 and CXCR7 were expressed in ADSCs at passage zero (P0), P1, and P3, and the expression of both increased after SDF-1 stimulation. The level of expression of the mRNAs and proteins of SDF-1, CXCR4, and CXCR7 in ADSCs was higher after hypoxic conditioning. We then knocked down CXCR4 or CXCR7 using small interfering RNAs and found that the mRNA levels of CXCR4 and CXCR7 were considerably downregulated in the si-CXCR4/7-transfected cells. We also found that the SDF-1/CXCR4 axis was required for the migration of ADSCs. The phosphorylation levels of Janus kinase (JAK), protein kinase B (AKT), and extracellular regulated protein kinase significantly increased in SDF-1-stimulated ADSCs. However, the migration of ADSCs was suppressed when the corresponding specific inhibitors were used to block JAK and AKT signaling or silence CXCR4, whereas no significant change was observed in the migratory ability of ADSCs when the ERK pathway was blocked or CXCR7 was silenced.

CONCLUSIONS

The SDF-1/CXCR4 axis is involved in the migration of ADSCs and may play a role in the migrate of ADSCs in SUI.

A holistic approach to assessing an individual with urinary incontinence

Urinary incontinence can have an overwhelmingly negative impact on an individual's quality of life. The personal, physical, psychosocial and sexual implications of urinary incontinence can affect health and well-being. This can increase the risk of falls, depression, anxiety, social isolation alongside a greater need for long-term care from a individual's own home. Statically, the prevalence rates of urinary incontinence increases with age; however, incontinence is not an inevitable or acceptable part of ageing-symptoms can be improved and managed effectively for suffers of this common condition. Urinary incontinence can be challenging to assess, address and overcome for individuals. However health professionals need to have the expertise and experience to undertake a comprehensive continence assessment. When assessment is completed evidence-based interventions can be recommended, implemented and subsequently evaluated.

Prevalence and factors associated with urinary incontinence in female crossfitters: A cross-sectional study

OBJECTIVE

To determine the prevalence and factors associated with urinary incontinence (UI) in female crossfitters.

METHODS

This is a cross-sectional study. Data were collected using assessment forms: Knowledge, Attitude and Practice survey for young female athletes; Incontinence Severity Index; and International Consultation on Incontinence Questionnaire for UI. Descriptive analysis was conducted to obtain absolute and relative frequencies, means and 95% confidence intervals (95% CI). Multivariate analysis was carried out to determine the association between UI and sociodemographic, gynecological-obstetric, and anthropometric variables, associated morbidities, previous history and physical activity.

RESULTS

Prevalence of UI, in the 189 included volunteers, was 38.6% and the most frequent type was stress UI (69.9%). A total of 72.6% of incontinent women reported urine loss during CrossFit training. Knowledge (53.4%) and attitude (86.2%) regarding UI were generally adequate, while prevention, management and treatment were inadequate (96.3%). The predominant characteristics of UI were frequency of once a week or less (74.0%), in small amounts (86.3%), mild intensity (57.5%) and slight impact on quality of life (64.3%). In multivariate analysis, no variable was significantly associated with UI.

CONCLUSIONS

The prevalence of UI in female crossfitters was 38.6%. The factors investigated did not contribute to the development of UI.

Assessment and management of urinary incontinence in women

Urinary incontinence is a common and usually hidden issue that can affect women of all ages. It is often ignored by the patient because of their misconception that incontinence is an inevitable consequence of ageing and their low expectations of successful treatment. There are various types of incontinence, with symptoms that can significantly affect patients' quality of life. This article aims to enhance nurses' understanding of the types of urinary incontinence affecting women, associated risk factors and continence assessment, as well as the initial investigations and conservative treatments that can be instigated by general nurses. It also discusses some of the advanced treatments offered by specialist services. The article emphasises the importance of undertaking a holistic continence assessment to ensure appropriate continence care is provided, and how tailoring this care to the individual can improve adherence to treatment plans.