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hair related research references
J Investig Dermatol Symp Proc. 2003 Jun;8(1):28-38.
Hair follicle stem cells.
Lavker RM, Sun TT, Oshima H, Barrandon Y, Akiyama M, Ferraris C, Chevalier G, Favier B, Jahoda CA, Dhouailly D, Panteleyev AA, Christiano AM.
Department of Dermatology, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA. R-lavkeorthwestern.edu
The workshop on Hair Follicle Stem Cells brought together investigators who have used a variety of approaches to try to understand the biology of follicular epithelial stem cells, and the role that these cells play in regulating the hair cycle. One of the main concepts to emerge from this workshop is that follicular epithelial stem cells are multipotent, capable of giving rise not only to all the cell types of the hair, but also to the epidermis and the sebaceous gland. Furthermore, such multipotent stem cells may represent the ultimate epidermal stem cell. Another example of epithelial stem cell and transit amplifying cell plasticity, was the demonstration that adult corneal epithelium, under the influence of embryonic skin dermis could form an epidermis as well as hair follicles. With regards to the location of follicular epithelial stem cells, immunohistochemical and ultrastructural data was presented, indicating that cells with stem cell attributes were localized to the prominent bulge region of developing human fetal hair follicles. Finally, a new notion was put forth concerning the roles that the bulge-located stem cells and the hair germ cells played with respect to the hair cycle.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12894992&dopt=Abstract [PubMed - in process]
Biomed Chromatogr. 2001 Feb;15(1):45-9.
Identification of reaction products of methamphetamine and hydrogen peroxide in hair dye and decolorant treatments by high-performance liquid chromatography/mass spectrometry.
Tanaka S, Iio R, Chinaka S, Takayama N, Hayakawa K.
Forensic Science Laboratory, Ishikawa Prefectural Police Headquarters, 2-1-1 Hirosaka, Kanazawa 920-8553, Japan.
The effect of hydrogen peroxide, a main component of hair dye and decolorant treatments, on methamphetamine (MA) was studied. Two analytical methods, thin-layer chromatography (TLC) and high-performance liquid chromatography/mass spectrometry (LC/MS), were used for the separation and identification of MA derivatives. Mixtures of MA solutions and hydrogen peroxide that had been incubated at 39 degrees C for 24 h were shown to contain para-hydroxy MA by TLC and para-, meta- and ortho-hydroxy MAs by LC/MS. In addition, MA N-oxide and N-hydroxy MA were found in MA/hydrogen peroxide mixtures immediately after mixing. Therefore, we concluded that MA changed to MA N-oxide and N-hydroxy MA before changing to para-, meta- and ortho-hydroxy MAs.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11180300&dopt=Abstract
Cytogenet Cell Genet. 2000;91(1-4):57-61.
A high frequency of XO offspring from X(Paf)Y* male mice: evidence that the Paf mutation involves an inversion spanning the X PAR boundary.
Burgoyne PS, Evans EP.
Division of Developmental Genetics, National Institute for Medical Research, London, UK. pburgoimr.mrc.ac.uk
It has previously been reported that 19% of the daughters of males carrying the X-linked mutation patchy fur (Paf) are XO with a maternally derived X chromosome. We now report that hemizygous Paf males that also carry the variant Y chromosome Y*, show a much increased XO production ( approximately 40% of daughters). We hypothesize that the Paf mutation is associated with an inversion spanning the pseudoautosomal region (PAR) boundary, and that this leads to preferential crossing over between the resulting inverted region of PAR and an equivalent inverted PAR region within the compound Y* PAR. This would lead to the production of dicentric X and acentric Y products and consequent sex chromosome loss. This interpretation is supported by analysis of the sex chromosome complements at the second meiotic metaphase, which revealed a high incidence of dicentrics. Another curious feature of the Paf mutation is that mice that are homozygous Paf have more hair than mice that are hemizygous Paf. This can be explained if the Paf mutation is a hypomorphic mutation that escapes X inactivation because, unlike the wild type allele, it is now located within the PAR. 2001 S. Karger AG, Basel
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11173831&dopt=Abstract
J Invest Dermatol. 1999 Apr;112(4):470-5.
Highly persistent label-retaining cells in the hair follicles of mice and their fate following induction of anagen.
Morris RJ, Potten CS.
The Lankenau Medical Research Center, Wynnewood, Pennsylvania 19096, USA.
We have identified some unusually persistent label-retaining cells in the hair follicles of mice, and have investigated their role in hair growth. Three-dimensional reconstruction of dorsal underfur follicles from serial sections made 14 mo after complete labeling of epidermis and hair follicles in neonatal mice disclosed the presence of highly persistent label-retaining cells associated with the first-generation follicle involved in the production of the first wave of hairs, commonly called the bulge. The label-retaining cells were most often found on the ventral surface of the first-generation follicle, five cell positions from the base, near the attachment site of the arrector pilorum muscle. No label-retaining cells were found in the hair canal, sebaceous gland, or hair germ. These label-retaining cells remained in the follicle following induction of anagen by plucking of the hairs. Surprisingly, they were not part of the first wave of mitotic activity following plucking, but instead underwent mitosis beginning 42 h after plucking. Label-retaining cells or their labeled daughters were not found in the hair germs through 48 h following induction of anagen by plucking, but instead remained in their subsebaceous follicular location even upon completion of the hair growth cycle 21 d later. These label-retaining cells are, therefore, unlikely to contribute to the formation of a new anagen follicle.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10201531&dopt=Abstract
Beautiful, dense hair is a dream for many people.
Hair growth is a sophisticated biological process, which has not yet been understood.
A multitude of therapeutic measures, including drugs, surgery, and suppelements have been developed.
However, due to the diversity of the problems underlying hair loss, there is no single solution that
can address all hair loss cases. Another problem is that most of chemical drugs and hair transplantation
surgeries are not free from varying degrees of undesirable side effects on health.
Anecdotally, it shows prositive results and improvement especially for age-related hair thinning and hair loss
for a large group of people who take it as suggested. Although personal experiences and anecdotal evidences
indicate that it works, we still do not understand the mechanisms of action as to how Hair Million works to
help stop hair loss, and promote hair growth. There has been no clinical trials nor placebo controlled statistical
analysis on the efficacy of Hair Million on hair loss and hair growth. R & D costs dearly, and no one would
afford to research complex herbal ingredients, which are often not patentable at all because they are
made by mother nature.
DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones)
or estrogens (female hormones) in the cells.
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