bugbug said:
Read the whole paper not just the abstact. As you quoted from the abstract that yes indeed when they inhibited wnts from 0 -17 they abrogated the neogenesis but when they inhibited it from days 0-10 the follicular neogenesis increased 3 fold over just wounding. Additionally the hair quaility was better when they inhibited Wnts during the 1st 10 days. You need to read the whole paper.
"Because Wnt proteins have a key role in normal hair follicle development
and cycling11,23,24, we tested whether Wnt blockade inhibits hair
follicle neogenesis following wounding. We induced expression of
secreted Dkk1, a Wnt inhibitor, in tetO-Dkk1;K5rtTA mice at the
time of wounding until 17 days later (Fig. 4g–i, k, l). Although the
time to re-epithelialization was normal, hair follicles did not form
(Supplementary Table 1). Induction of Dkk1 between days 0 and 10
after wounding did not prevent hair follicle neogenesis. However,
transient induction of Dkk1 after wound closure inhibited neogenesis
and indicated the necessity of Wnt signalling for hair follicle neogenesis
(Supplementary Table 1)."
Looking at the p values from Supplementary Table 1 it can be seen that the difference of 97 hairs to 75 hairs when wnt was not inhibited from days 0-10 is not significant and that is why there was no increase in hairs noted with wnt inhibition in the paper itself or the abstract.As far as I could see there was nothing about a difference in quality of hairs.
However there was an interesting note about hair density which is something that people have been wondering about with Follica.
"Supplementary Table 2: Hair follicle density: To assess hair follicle density, we measured the distance between
follicles in three different conditions: 1. intact back skin in normal mice, 2. the area of new hair follicle formation
following wounding in normal mice, and 3. the area of new hair follicle formation following wounding in
Wnt7a overexpressing mice. We examined 100 follicles in 3 mice for each condition.
In normal mice, the space between hair follicles is smaller along the sagittal axis (head to tail) compared
to the coronal axis (side to side). For example, the distance between follicles in intact pelage skin of normal
mice was 0.09±0.02 mm sagittally and 0.17±0.04 mm coronally. In contrast, the newly formed follicles in both
control and K14-Wnt7a mice following wounding were spaced with an intermediate distance between them
(0.11±0.03 mm for control and 0.11±0.04 for Wnt7a mice), and there was no apparent difference between coronal
and sagittal distances.SD, standard deviation"
and this about the direction that the hairs grew in at which at least one person has expressed concern over before.
"Supplementary Figure 2: Hair follicle orientation. To evaluate the
orientation of the newly formed follicles, we examined the direction
of the follicles in 3 mice. Approximately 72-80% of the follicles
were pointing in the correct direction (within approximately
a 30 degree angle). A representative example is shown here in this
K14CreR26R mouse in which the keratinocytes are blue for easier
visualization of the follicles. In this mouse, 31/41 hair follicles
were growing in the correct cephalad orientation. The image is
taken 30 days after wounding."
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