Potential Breakthrough in Reversing Hair Loss and Wrinkles
Introduction to Aging Indicators
Hair loss and wrinkles are commonly viewed as irreversible signs of aging. However, recent research published in *Cell Death and Disease* suggests that this perception may be changing. A team of British scientists has discovered a method to potentially reverse these age-related changes in mice.
The Role of Mitochondria in Aging
The aging process is closely associated with a gradual decline in mitochondria, which are small organelles present in nearly every cell. Mitochondria serve as the energy powerhouses of cells, and their depletion can lead to various diseases. These diseases can range from age-related conditions to chronic illnesses like cardiovascular disease, diabetes, and cancer.
Research Methodology: Mouse Model of Mitochondrial Depletion
Creating the Mouse Model
In their study, the British research team developed a mouse model to investigate the impact of mitochondrial DNA depletion on aging and related diseases. They induced a mutation in a critical mitochondrial DNA gene, hypothesizing that this would lower the mitochondrial DNA content across tissues, consequently reducing energy production. The gene mutation could be activated when the eight-week-old mice ingested food or water containing the antibiotic doxycycline. Their findings were published in *Cell Death and Disease*.
Skin Changes Linked to Mitochondrial DNA Depletion
The researchers observed significant changes in the skin of the mice just two weeks after activating the mutation. Continued treatment illustrated the effects of both extrinsic factors (like sun exposure and pollution) and intrinsic factors (such as genetics) on aging. The skin thickened and wrinkled, particularly in female mice, along with an inflammatory response that hindered collagen production, crucial for skin structure and elasticity.
Hair Loss Associated with Mitochondrial DNA Depletion
After four weeks of doxycycline consumption, hair loss became evident in the mice. The patterns of hair loss varied between male and female mice, likely due to the influence of sex hormones on mitochondrial function. The study revealed that mitochondrial DNA depletion severely impaired hair follicle function, preventing the production of healthy hair shafts. Additional signs of aging, such as graying, thinning hair, slowed movement, spine rounding, lethargy, and weight loss, were also noted.
Reversibility of Mitochondrial DNA Depletion Effects
Restoration of Physical and Cellular Signs
Unexpectedly, the researchers found that the observed changes were reversible. After removing doxycycline from the mice’s diet for one month, the physical, cellular, and histological signs of aging were reversed, with mitochondrial DNA levels returning to normal.
Future Research Directions
This study highlights the link between decreased mitochondrial DNA levels and aging-related changes in skin and hair. Importantly, it provides the first evidence that age-associated hair loss and wrinkles can be reversed in a mouse model. Continued research is essential to further understand the pathology of aging and diseases connected to mitochondrial DNA depletion, paving the way for therapeutic strategies to combat these conditions.
Written by Natasha Tetlow, PhD
Reference: Singh B, et al. Reversing wrinkled skin and hair loss in mice by restoring mitochondrial function. Cell Death Dis. 2018. Available at doi:10.1038/s41419-018-0765-9.