RT Journal Article SR Electronic T1 Three-dimensional understanding of the morphological complexity of the human uterine endometrium JF bioRxiv FD Cold Spring Harbor Laboratory SP 2020.05.29.118034 DO 10.1101/2020.05.29.118034 A1 Manako Yamaguchi A1 Kosuke Yoshihara A1 Kazuaki Suda A1 Hirofumi Nakaoka A1 Nozomi Yachida A1 Haruka Ueda A1 Kentaro Sugino A1 Yutaro Mori A1 Kaoru Yamawaki A1 Ryo Tamura A1 Tatsuya Ishiguro A1 Teiichi Motoyama A1 Yu Watanabe A1 Shujiro Okuda A1 Kazuki Tainaka A1 Takayuki Enomoto YR 2020 UL http://biorxiv.org/content/early/2020/05/31/2020.05.29.118034.abstract AB The histological basis of the human uterine endometrium has been established by 2D observation. However, the fundamental morphology of endometrial glands is not sufficiently understood because these glands have complicated winding and branching patterns. To construct a big picture of endometrial gland structure, we performed tissue-clearing-based 3D imaging of human uterine endometrial tissue. Our 3D immunohistochemistry and 3D layer analyses revealed that endometrial glands formed a plexus network in the stratum basalis, similar to the rhizome of grass. We then extended our method to assess the 3D morphology of adenomyosis, a representative “endometrium-related disease”, and observed 3D morphological features including direct invasion of endometrial glands into the myometrium and an ant colony-like network of ectopic endometrial glands within the myometrium. Thus, 3D analysis of the human endometrium and endometrium-related diseases will be a promising approach to better understand the pathologic physiology of the human endometrium.Competing Interest StatementThe authors have declared no competing interest.