interessante anche questo estratto:
Citazione:
Novel Function of TGFb1 as a Key
Pathogenic Molecule in Androgenetic
Alopecia: Potentiation of Androgen
Receptor Through Smad3
Inui, Shigeki; Nakajima, Takeshi; Itami, Satoshi; Dept. of
Regenerative Dermatology, Osaka University School of
Medicine, Suitashi, Japan
We have reported the pathogenic role of TGF-b1 production
and activation by androgen in balding dermal papilla cells
(bald DPCs) using the coculture system of bald DPCs and
keratinocytes. Here, we examined the effect of TGF-b1
on androgen receptor (AR) transactivation by transient
transfection assays of MMTV-luciferase reporter vector.
TGF-b1 at 0.2 and 2.0ng/ml increased AR transactivation
to 2.5- and 2.7-fold, respectively. Because expression
of ARA55, one of AR coactivators, is increased by TGFb1,
we tested the possibility that TGF-b1 potentiates AR
through ARA55 by using dominant negative C-terminal
fragment ARA55. Rather, the dominant negative ARA55
augmented TGF-b1 (2.0ng/ml) effect on AR up to 5.1-fold.
When exogenous ARA55 was overexpressed in bald DPCs,
TGF-b1 increased AR activity only to 1.5-fold. Therefore,
we suggest that ARA55 constitutively coactivates AR but
paradoxically interferes TGF-b1 augmentation for AR. Next,
we examined whether Smad3 can mediate the signal from
TGF-b1 to AR by reporter assays. The silencing for Smad3 by
siRNA in bald DPCs reversed completely TGF-b1 potentiation
of AR, demonstrating that this signal is dependent on
Smad3. Together, in vivo situation of androgenetic alopecia,
TGF-b1 produced by androgen from bald DPCs suppresses
epithelial cell growth and causes early catagen induction
in a paracrine manner and furthermore enhance androgen
sensitivity in bald DPCs in a autocrine manner, recapitulating
the reciprocal pathomechanism between androgen
and TGF-b1.
Con sorprendente acume [^] avevo empiricamente sostenuto la stessa identica tesi tempo addietro, su questo forum, che viene ora confermata...
Citazione:A Relationship Between Early Greying and
Extent of Male Pattern Baldness?
Davies, Paul G.; Randall, Val A.; University of Bradford,
Bradford, UK
Both androgenetic alopecia and loss of hair pigmentation
advance gradually with increased age. However, androgenetic
alopecia is a predominantly male, androgendependent
condition, while androgen-independent canites
occurs in both sexes. Observations suggest that men
with early pigment loss retain scalp hair, but this may be
an inaccurate impression due to the greater visibility of
white hair.
To determine whether there is any relationship between
these processes, the extent of balding and pigment loss was
compared between men over 18 who were, or were not,
greying before 30. A single observer scored balding extent
using the Hamilton scale and pigmentation loss on a scale
of 1 to 5 in 364 Thais. A further 216 Europeans completed
the same questionnaire assessing their own hair status. Data
was analysed in each group separately and combined.
Mean ages at assessment did not differ between men
grey before, or after, 30: 26 early Thais 38.7 years, others
39.4; 50 early Europeans 49.4, others 52.8. The extent of
both male pattern balding and pigment loss was positively
correlated with increasing age whenever canites started.
Aging was more strongly correlated with pigment loss.
Mean pigment scores were higher with pigment loss before
30; contrastingly, mean Hamilton scores were lower.
These results concur with the age-related nature of both
conditions and indicate that early pigment loss remains
advanced with age. However, the lower Hamilton scores in
early canites opposes predictions if both were solely aging
related. Early pigment loss appears inversely related to male
pattern alopecia extent.
e poi, qualcosa che mi interessa anche a livello sistemico:
Citazione:Aging of Hair III: The Anti-Aging Ef#64257;cacy
of Eucalyptus Extract
Nagase, Shinobu; Mamada, Akira; Kajiura, Yoshio; Ezawa,
Yusuke; Abe, Hiroko; Satoh, Naoki; Itou, Takashi; Kao
Corporation, Tokyo, Japan
Older women have the complaint of hair bounce reduction
because of hair thinning with age. For the complaint, there
are many types of hair growth enhancer, which increases
hair density and/or hair thickness. On the other hand, older
women also have the complaint of decrease in hair luster
with age. We have found that curved hair increases with
age and the curved hair causes the hair luster decrease.
Furthermore, we have found that Eucalyptus extract
can improve not only hair bounce but also hair luster of
older women. In this study, we studied the mechanism
of Eucalyptus extract on hair properties.
A scalp lotion containing 3% of Eucalyptus extract was
prepared. The lotion was applied to the scalp of female
panelists (aged 40-60), who had the complaint of hair
bounce and hair luster. The lotion was applied twice per day
for three to twelve months. Hair #64257;bers were sampled before
and after the application and used for the analyses of hair
properties. Hair luster and bounce were evaluated by hair
stylists. Hair curvature and hair elasticity were measured.
We have con#64257;rmed that the hair luster and bounce of
older women are improved by the application of Eucalyptus
extract. It was found that hair curvature is reduced and hair
elasticity is raised by the application. These results suggest
that Eucalyptus extract has an anti-aging ef#64257;cacy in terms of
hair shape and bounce.
questo dimostra in modo abbastanza inequivocabile il ruolo dell'ambiente.
Citazione:Androgenetic Alopecia: Concordance of
Hair Loss in Twin Pairs
Mirmirani, Paradi;1,2 Price, Vera;2 Ettefagh, Leila;1
1. Case Western Reserve University, Cleveland, OH, USA;
2. Universtiy of California, San Francisco, San Francisco,
CA, USA
Androgenetic alopecia is a common disorder that affects
both men and women, but its mode of inheritance has
been a contested topic. Our objective was to measure and
compare hair loss in monozygotic and dizygotic twins and
to determine concordance rates between pairs. In fraternal
twins, expected concordance is 50% for a monogenetic
simple Mendelian transmission and less than 50% for
a polygenetic trait; 100% concordance is expected for
monozygotic twins. Recruitment of twins took place at the
2004 National Twinsday Festival in Twinsburg, Ohio. Twins
#64257;lled out hair questionnaires to determine demographics
and exclusion criteria. Each participant had stereotactic
frontal/vertex/occipital scalp photographs(Can#64257;eld
Scienti#64257;c). Buccal swabs were collected for zygosity
testing and were perfomed by AnaGen Technologies, Inc.
The photographs were evaluated in a blind manner by
one of the investigators(VHP) for degree of alopecia and
concordance/discordance amongst twin pairs. A total of
44 twin pairs were enrolled, 16 were excluded from the
study. Of the 28 twin pairs evaluated, 2 of the 4 dizygotic
twins were discordant(50%) and 3 of the 24 monozygotic
twins were discordant(11%). This preliminary data shows
an unexpected discordance rate of 11% amongst the
monozygotic twin pairs suggesting that environment may
have a greater in#64258;uence on androgenetic alopecia than