Abstract:
:We describe a protein family in Drosophila containing six adenosine deaminase-related growth factors (ADGFs), which are homologous to a mitogenic growth factor discovered in conditioned medium from cells of a different fly species, Sarcophaga. Closely related proteins have been identified in other animals, and a human homolog is implicated in the genetic disease Cat-Eye Syndrome. The two most abundantly expressed ADGFs in Drosophila larvae are ADGF-A, which is strongly expressed in the gut and lymph glands, and ADGF-D, which is mainly expressed in the fat body and brain. Recombinant ADGF-A and ADGF-D are active adenosine deaminases (ADAs), and they cause polarization and serum-independent proliferation of imaginal disk and embryonic cells in vitro. The enzymatic activity of these proteins is required for their mitogenic function, making them unique among growth factors. A culture medium prepared without adenosine, or depleted of adenosine by using bovine ADA, also stimulates proliferation of imaginal disk cells, and addition of adenosine to this medium inhibits proliferation. Thus ADGFs secreted in vivo may control tissue growth by modulating the level of extracellular adenosine.
journal_name
Proc Natl Acad Sci U S Aauthors
Zurovec M,Dolezal T,Gazi M,Pavlova E,Bryant PJdoi
10.1073/pnas.062059699keywords:
subject
Has Abstractpub_date
2002-04-02 00:00:00pages
4403-8issue
7eissn
0027-8424issn
1091-6490pii
062059699journal_volume
99pub_type
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