Monovalent blood brain barrier shuttle modules
Herein is reported a blood brain barrier shuttle module comprising a brain effector entity, a linker and one monovalent binding entity which binds to a blood brain barrier receptor, wherein the linker couples the effector entity to the monovalent binding entity which binds to the blood brain barrier receptor wherein the monovalent binding entity does not comprise the variable domains of the anti-transferrin receptor antibody 8D3 (SEQ ID NO: 01 and SEQ ID NO: 02) or of the variant anti-transferrin receptor antibody 8D3v (SEQ ID NO: 01 and SEQ ID NO: 03).
1. A blood brain barrier shuttle module comprising a brain effector entity, optionally a linker and exactly one (monovalent) binding entity which binds to transferrin receptor (TfR), wherein the linker if present couples the effector entity to the monovalent binding entity, wherein the monovalent binding entity comprises an anti-TfR antibody or fragment thereof comprising (a) a HVR-H1 comprising the amino acid sequence of SEQ ID NO: 109; (b) a HVR-H2 comprising the amino acid sequence of SEQ ID NO: 110; (c) a HVR-H3 comprising the amino acid sequence of SEQ ID NO: 112; (d) a HVR-L1 comprising the amino acid sequence of SEQ ID NO: 113; (e) a HVR-L2 comprising the amino acid sequence of SEQ ID NO: 114; and (f) a HVR-L3 comprising the amino acid sequence of SEQ ID NO: 115.
2. The blood brain barrier shuttle module according to claim 1 , wherein the monovalent binding entity comprises an anti-TfR antibody or fragment thereof comprising a heavy chain variable domain having the amino acid sequence of SEQ ID NO:23 and a light chain variable domain having the amino acid sequence of SEQ ID NO:24.
3. The blood brain barrier shuttle module according to claim 1 , wherein the monovalent binding entity specifically binds to human transferrin receptor and to cynomolgus transferrin receptor.
4. The blood brain barrier shuttle module according to claim 1 , wherein the monovalent binding entity comprises one scFab directed to the transferrin receptor.
5. The blood brain barrier shuttle module according to claim 1 , wherein the monovalent binding entity comprises one scFv directed to the transferrin receptor.
6. The blood brain barrier shuttle module according to claim 1 , wherein the brain effector entity is selected from the group consisting of neurological disorder drugs, neurotrophic factors, growth factors, enzymes, cytotoxic agents, antibodies directed to a brain target, monoclonal antibodies directed to a brain target.
7. The blood brain barrier shuttle module according to claim 6 , wherein the brain target is selected from the group consisting of β-secretase 1, Aβ (Abeta), epidermal growth factor, epidermal growth factor receptor 2, tau, phosphorylated tau, phosphorylated tau(pS422), apolipoprotein E4, alpha synuclein, CD20, huntingtin, prion protein, parkin, presenilin 2, gamma secretase, death receptor 6, amyloid precursor protein, p75 neurotrophin receptor and caspase 6.
8. The blood brain barrier shuttle module according to claim 1 , wherein the monovalent binding entity is conjugated to the C-terminal end of the brain effector entity either directly or via a linker.
9. The blood brain barrier shuttle module according to claim 1 , wherein the brain effector entity comprises a full length antibody directed to a brain target.
10. A pharmaceutical formulation comprising a blood brain barrier shuttle module according to claim 1 .