Abstract:
:Sulfate is an important component relating to normal proteoglycan secretion and normal motility in the marine sponge, Microciona prolifera. The following alterations were observed in sponge cells when sulfate free artificial sea water was used as the suspension medium: 1) impairment of aggregation, 2) loss of cell movements, 3) a marked reduction in the secretion of the adhesion proteoglycan (AP). Reversal of this effect occurred if sulfate depleted cells were again rotated in sulfate containing artificial sea water. Motility and reaggregation of sulfate deprived cells could be completely restored by purified AP, but only if cells were first pre-conditioned in normal sea water. Comparisons of 35SO4(2-) uptake between normal and sulfate deprived cells which had been treated to reduce preformed secretions showed a marked increase in 35SO4(2-) uptake and incorporation which could be greatly augmented in the presence of Ca2+/Mg2+. Excessive retention of AP in sulfate starved cells demonstrated by immunostaining suggested that AP secretion and cellular motility may be controlled by a sulfate dependent secretogogue or that undersulfated AP itself had developed a secretory defect. SDS-PAGE of Triton treated cellular extracts demonstrated a 116 kDa 35SO4(2-) sulfated band which co-migrated with AP, but only in extracts derived from sulfate starved cells. Western blots prepared from such extracts incubated in the presence of a monoclonal anti-band 3 antibody demonstrated labelling of a single 97 kDa band only in material from sulfate deprived cells. The absence of this component in normal cell extracts indicated that this protein may be involved in facilitated sulfate transport. This study lends support to a heretofore unrecognized role for sulfate in cell motility and secretion.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Kuhns WJ,Popescu O,Burger MM,Misevic Gdoi
10.1002/jcb.240570109subject
Has Abstractpub_date
1995-01-01 00:00:00pages
71-89issue
1eissn
0730-2312issn
1097-4644journal_volume
57pub_type
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