Human R-spondin 1 protein (RSPO1) is the prototypic member of the R-spondin family and is used to potentiate Wnt signalling in many organoid culture systems including intestinal and tumor (cancer) organoid culture. R-spondin 1 is also required for hematopoietic stem cell specification and cancer cell migration and survival.

13kDa highly pure, bioactive domain of human R-spondin 1 comprising the two cysteine-rich furin-like domains of R-spondin 1, which are necessary and sufficient for Wnt signalling potentiation and are the essential domains for activity in stem cell and organoid culture.  Qk006 is animal-free and not glycosylated to ensure production of homogeneous protein and enhanced comparability between batches. Used to replace R-spondin conditioned media for improved reproducibility in chemically defined organoid culture media.

Recombinant R-spondin 1 LR5 protein is engineered to act as a high affinity ligand for the LGR5 receptor.  In epithelial tissues LGR5 marks the stem cell population.  This engineered protein, R-spondin 1 LR5, activates wnt signalling only in the LGR5+ stem cell population.  R-spondin1 LR5 has been tested in intestinal organoid culture and supports organoid survival and growth. As LGR5 specifically marks stem cells and is not found on transit amplifying cells, the lower crypt multiplicity seen in organoid cultures with R-spondin 1 LR5 (in comparison to wild-type R-spondin 1, Qk006) supports the notion that this engineered form is acting specifically on stem cells.  This specialized form of R-spondin 1 was developed in Marc de la Roche’s lab (University of Cambridge).

Human R-spondin 3 protein potentiates Wnt signalling in and has been shown to function in crypt regeneration in the intestine and control stem cell and progenitor cell behaviour during kidney development. R-spondin 3 is used alongside R-spondin 1 in intestinal organoid culture systems.

17kDa highly pure, bioactive domain of human R-spondin 3 comprising the two cysteine-rich furin-like domains, which are necessary and sufficient for Wnt signalling potentiation and are the essential domains for activity in stem cell and organoid culture. Animal-free and carrier-protein free.