Table 1

Characteristics and effects of CD44 antibodies used

AntibodyIsotypeFine specificity*Complement bindingEffect on hyaluronan binding to CD44Therapeutic in murine autoimmunityLeukocyte reactivePlatelet effects
Platelet reactiveInduce thrombocytopeniaTherapeutic in ITP
5035-41.1D Mouse IgG1 All isoforms No — Yes Yes NS Yes 
KM114 Rat IgG1 All isoforms§ No, ↓ Yes Yes NS Yes 
KM81 Rat IgG2b All isoforms§ Yes ↓ Arthritis Yes Yes NS Yes 
KM201 Rat IgG1 All isoforms§ No ↓ Yes Yes Yes Yes 
9A4 Rat IgG1 Variant 6 No — No No NS No 
10D1 Rat IgG1 Variant 4 No — No No NS No 
IRAWB14 Rat IgG2a All isoforms Yes ↑ Yes Yes Yes No 
IM7 Rat IgG2b All isoforms Yes — Arthritis, IDDM, EAE Yes Yes Yes No 
AntibodyIsotypeFine specificity*Complement bindingEffect on hyaluronan binding to CD44Therapeutic in murine autoimmunityLeukocyte reactivePlatelet effects
Platelet reactiveInduce thrombocytopeniaTherapeutic in ITP
5035-41.1D Mouse IgG1 All isoforms No — Yes Yes NS Yes 
KM114 Rat IgG1 All isoforms§ No, ↓ Yes Yes NS Yes 
KM81 Rat IgG2b All isoforms§ Yes ↓ Arthritis Yes Yes NS Yes 
KM201 Rat IgG1 All isoforms§ No ↓ Yes Yes Yes Yes 
9A4 Rat IgG1 Variant 6 No — No No NS No 
10D1 Rat IgG1 Variant 4 No — No No NS No 
IRAWB14 Rat IgG2a All isoforms Yes ↑ Yes Yes Yes No 
IM7 Rat IgG2b All isoforms Yes — Arthritis, IDDM, EAE Yes Yes Yes No 

NS indicates not significant; IDDM, insulin-dependent diabetes mellitus; and EAE, experimental autoimmune encephalitis.

*

As stated by the manufacturer.

Based on isotype.

Based on the present study at a dose of 50 μg/mouse.

§

All recognize epitopes in the hyaluronan-binding region.

Recognize a different epitope than KM114 and KM201 (as stated by the antibody data sheets of BD Biosciences PharMingen).

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