P. Dockery et al., Changes in basement membrane thickness in the human endometrium during theluteal phase of the menstrual cycle, HUM REP UPD, 4(5), 1998, pp. 486-495
We have examined aspects of the fine structure of the basal laminae associa
ted with the luminal and glandular epithelium and small blood vessels in th
e human endometrium, Four short studies are presented and reviewed, Study 1
examined biopsies from 20 fertile women taken on days after the luteinizin
g hormone surge (LH): LH +2, 4, 6, 8 and 10, The basal lamina (both lamina
densa and lucida) increased in thickness over the period studied, Study 2 a
gain studied the glandular epithelium and examined the effect of RU486 (a p
rogesterone receptor blocker) administered on day LH +3 and biopsied on day
LH +6, The basal laminae were found to be the same as LH +2 control group
but thinner than LH +6 control, Study 3 documented increased thickness of t
he basal laminae between LH +6, 8 and 13 in the luminal epithelium, The wit
hin-group coefficient of variation was 16% and 27% for LH +6 and LH +13 gro
ups but only 2% for LH +8, Study 4 demonstrated an increase in basal lamina
thickness associated with small blood vessels between LH +6 and LH +10 in
normal fertile women. The basal lamina provides the interface between epith
elial and mesenchymal environments; changes in its structure can alter the
phenotypic expression of the epithelia, It is one of the maternal barriers
that must he transgressed by the trophoblast during: implantation, Together
, these combined studies provide quantitative baseline structural informati
on on the electron microscopical appearance of the basal lamina during the
luteal phase of the menstrual cycle.