- Reaction score
- 194
@Squeegee 2.0
While the studies you linked were interesting to read, they don’t really prove anything. You linked me case studies, which are just observational studies that can't be used to generate hypotheses because they don't use a comparison/control group.
You can't really make conclusive evidence with these studies that are based on just one or a handful of patients.
The study on methotrexate was pretty interesting, but the people who did the study proposed that methotrexate's effect on androgen synthesis and metabolism was the cause. Kind of supports the idea that androgens play a big role in hair loss. Again, i'm not saying the only role, but a significant one.
The benoxaparen one was especially interesting because it's an NSAID. It kind of does show some association between inflammation and hairloss. What I noticed in the case reports in that study was that the patients had autoimmune conditions (except the osteoarthritis one). Ankylosing spondyloarthritis, psoriatic arthritis, and rheumatoid arthritis. Patients with autoimmune disorders tend to have overlapping other autoimmune disorders (look up HLA subtypes). Although i'm not an expert on the subject, from what i've studied so far I believe that their autoimmune conditions may have been associated with some type of autoimmune form of hairloss. So by treating their autoimmune disorder, they have had some resolution of their hairloss.
Finally, in the study on secukinumab you see at the very end they say "The possibility that repigmentation of hairs could be related to clinical healing of psoriasis on the scalp as a postinflammatory effect has also been taken into consideration, but hair darkening in our patient was observed in all areas of the scalp, regardless of whether he was affected by psoriasis" which is indeed very interesting. Finding hair darkening on other areas of the scalp was a pretty big find. One argument I have against this is that those areas that were not seen to be affected by psoriasis may have had some underlying psoriatic/autoimmune process that was not visible, and could have potentially flared into psoriasis should the patient not receive treatment. However, I could be wrong.
I find secukinumabm the most interesting of the bunch because it inhibits IL-17A and the effects are anti-aging.
Just a few pubmed to prove that inflammation plays a huge role in Androgenetic Alopecia
A hypothetical pathogenesis model for androgenic alopecia: clarifying the dihydrotestosterone paradox and rate-limiting recovery factors.
https://www.ncbi.nlm.nih.gov/pubmed/29407002
Evaluation of Perifollicular Inflammation of Donor Area during Hair Transplantation in Androgenetic Alopecia and its Comparison with Controls
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3877476/
Perifollicular fibrosis: pathogenetic role in androgenetic alopecia.
https://www.ncbi.nlm.nih.gov/pubmed/16755026
Inflammatory Phenomena and Fibrosis in Androgenetic Alopecia
https://link.springer.com/chapter/10.1007/978-3-642-02636-2_3
Evaluation of the Expression of Genes Associated with Inflammation and Apoptosis in Androgenetic Alopecia by Targeted RNA-Seq
https://www.karger.com/Article/FullText/484530
The Role of Inflammation and Immunity in the Pathogenesis of Androgenetic Alopecia
https://jddonline.com/articles/dermatology/S1545961611P1404X/1
Androgenetic alopecia in males: a histopathological and ultrastructural study.
https://www.ncbi.nlm.nih.gov/pubmed/19527330
Destruction of the arrector pili muscle and fat infiltration in androgenic alopecia.
https://www.ncbi.nlm.nih.gov/pubmed/24579818
Dermal fibrosis in male pattern hair loss: a suggestive implication of mast cells.
https://www.ncbi.nlm.nih.gov/pubmed/18286292
Androgenetic alopecia and microinflammation
https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1365-4362.2000.00612.x
Prostaglandin D2 inhibits hair growth and is elevated in bald scalp of men with androgenetic alopecia
https://www.ncbi.nlm.nih.gov/pubmed/22440736
Characterization of inflammatory infiltrates in male pattern alopecia: implications for pathogenesis
https://www.ncbi.nlm.nih.gov/pubmed/1390168
BALDNESS AND CALCIFICATION OF THE "IVORY DOME"
https://jamanetwork.com/journals/jama/article-abstract/256511
Fibrosing alopecia in a pattern distribution: patterned lichen planopilaris or androgenetic alopecia with a lichenoid tissue reaction pattern?
https://www.ncbi.nlm.nih.gov/pubmed/10677097
High-dose proinflammatory cytokines induce apoptosis of hair bulb keratinocytes in vivo.
https://www.ncbi.nlm.nih.gov/pubmed/11069516
Elements of the interleukin-1 signaling system show hair cycle-dependent gene expression in murine skin.
https://www.ncbi.nlm.nih.gov/pubmed/9854157