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Recombinant Mouse M-CSF巨噬細(xì)胞集落刺激因子

MCSF,
also known as CSF1,
is a fourαhelicalbundle
cytokine that is the primary regulator of macrophage survival, proliferation and differentiation （1 3）.
MCSF
is also essential for the survival and proliferation of osteoclast progenitors （1, 4）. MCSF
also primes and enhances macrophage killing of tumor cells and
microorganisms, regulates the release of cytokines and other inflammatory modulators from macrophages, and stimulates pinocytosis （2, 3）. MCSF
increases during
pregnancy to support implantation and growth of the decidua and placenta （5）. Sources of MCSF
include fibroblasts, activated macrophages, endometrial secretory
epithelium, bone marrow stromal cells and activated endothelial cells （1 5）.
The MCSF
receptor （cfms）
transduces its pleotropic effects and mediates its
endocytosis. MCSF
mRNAs of various sizes occur （3 9）.
Full length mouse MCSF
transcripts encode a 520 amino acid （aa） type I transmembrane （TM） protein with
a 462 aa extracellular region, a 21 aa TM domain, and a 37 aa cytoplasmic tail that forms a 140 kDa covalent dimer. Differential processing produces two
proteolytically cleaved, secreted dimers. One is an Nand
Oglycosylated
86 kDa dimer, while the other is modified by both glycosylation and chondroitinsulfate
proteoglycan （PG） to generate a 200 kDa subunit. Although PGmodified
MCSF
can circulate, it may be immobilized by attachment to type V collagen （8）. Shorter
transcripts encode M CSF
that lacks cleavage and PG sites and produces an Nglycosylated
68 kDa TM dimer and a slowly produced 44 kDa secreted dimer （7）.
Although forms may vary in activity and halflife,
all contain the Nterminal
150 aa portion that is necessary and sufficient for interaction with the M CSF
receptor
（10, 11）. The first 229 aa of mature mouse MCSF
shares 87%, 83%, 82% and 81% aa identity with corresponding regions of rat, dog, cow and human MCSF,
respectively （12, 13）. Human MCSF
is active in the mouse, but mouse MCSF
is reported to be speciesspecific

Recombinant Mouse M-CSF巨噬細(xì)胞集落刺激因子

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