October 2020 in “Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature” Mechanical stretching can promote hair growth by activating certain immune cells.
April 2018 in “Journal of Investigative Dermatology” Macrophages are more involved in Lichen planopilaris than in Frontal fibrosing alopecia.
February 2018 in “Archivio Istituzionale della Ricerca (Universita Degli Studi Di Milano)” Ferroportin in macrophages is crucial for hair growth and skin healing by managing iron distribution.
April 2016 in “Journal of Investigative Dermatology” A specific type of immune cells, called CD301b-expressing macrophages, are crucial for skin repair processes.
201 citations
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April 2017 in “Regeneration” Macrophages and fibroblasts help repair organs after injury, affecting whether they regenerate or scar.
119 citations
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November 1969 in “Journal of Ultrastructure Research” Macrophages help break down collagen around hair follicles during hair growth.
20 citations
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June 2024 in “Journal of Autoimmunity” Inflammation in rheumatoid arthritis increases steroid activation in cells, reducing inflammation.
November 2025 in “The Journal of Immunology” BST2 is highly expressed in certain immune cells in alopecia areata, suggesting a role in the disease.
The 1550 nm fractional Er:Glass laser improved hair regrowth in patients with androgenic alopecia, but didn't significantly change collagen type I, skin fibroblasts, or macrophages. More research is needed for optimal results.
June 2021 in “Journal of Cosmetic Dermatology” Laser treatment shows promise for hair growth, but needs further research.