Bilineage embryo-like structure from EPS cells can produce live mice with tetraploid trophectoderm

Self-organized blastoids from extended pluripotent stem (EPS) cells possess enormous potential for investigating postimplantation embryo development and related diseases. However, the limited ability of postimplantation development of EPS-blastoids hinders its further application. In this study, single-cell transcriptomic analysis indicated that the "trophectoderm (TE)-like structure" of EPS-blastoids was primarily composed of primitive endoderm (PrE)-related cells instead of TE-related cells. We further identified PrE-like cells in EPS cell culture that contribute to the blastoid formation with TE-like structure. Inhibition of PrE cell differentiation by inhibiting MEK signaling or knockout of Gata6 in EPS cells markedly suppressed EPS-blastoid formation. Furthermore, we demonstrated that blastocyst-like structures reconstituted by combining the EPS-derived bilineage embryo-like structure (BLES) with either tetraploid embryos or tetraploid TE cells could implant normally and develop into live fetuses. In summary, our study reveals that TE improvement is critical for constructing a functional embryo using stem cells in vitro.

Blastoid Mantle Cell Lymphoma: A Case Report / 대한피부과학회지

Mantle cell lymphoma (MCL) is a low-grade malignant lymphoma derived from a subset of B-cells localized in the mantle zone of the lymphoid follicle. MCL commonly involves extranodal sites, usually as a manifestation of disseminated disease. The immunophenotype of MCL is characterized as CD20+, CD5+ and Cyclin D1+. Blastoid mantle cell lymphoma (BV-MCL) is a rare variant and has a more aggressive clinical course. In the blastoid variant, the genetic profile is often more complex and includes tetraploid chromosomes, CCND1 amplification, a higher incidence of p53 gene mutations, and p16(INK4a) deletions. We report a case of a 62-year-old male patient who presented with erythematous subcutaneous nodules on the lower back. He had been treated for BV-MCL of the testis which had occurred 1 year ago. The analysis of histopathological and immunohistochemical examinations of the skin lesions also revealed a BV-MCL.