The role of calcium in the Chlamydomonas reinhardtii mating reaction

U. W. Goodenough, B. Shames, L. Small, T. Saito, R. C. Crain, M. A. Sanders, Jeffrey L Salisbury

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The mating reaction of Chlamydomonas reinhardtii entails a rapid series of cell-cell interactions leading to cell fusion. We have demonstrated (Pasquale, S. M., and U. Goodenough. 1987. J. Cell Biol. 105:2279-2293) that cAMP plays a key role in this process: gametic flagellar adhesion elicits a sharp increase in intracellular cAMP, and presentation of dibutyryl-cAMP to unmated gametes elicits all known mating responses. The present study evaluates the role of Ca2+ in this system. We document that the mating- induced increase in cAMP, and hence the mating responses themselves, are blocked by a variety of drugs known to interfere with Ca2+-sensitive processes. These data suggest that Ca2+-mediated events may couple adhesion to the generation of cAMP. Such events, however, appear to be localized to the flagellar membrane; we find no evidence for the mating-related increase in cytosolic free Ca2+ that has been postulated by others. Indeed, by monitoring the length of the Ca2+-sensitive centrin-containing nucleus- basal body connector, we show that cytosolic free Ca2+ levels, if anything, decrease in response to cAMP signaling. We confirm a previous report that Ca2+ levels increase in the mating medium, but document that this represents a response to augmented cAMP levels and not a prelude. Finally, we show that IP3 levels remain constant throughout the mating reaction. These results are discussed in terms of the various signal transduction systems that have now been identified in Chlamydomonas.

Original languageEnglish (US)
Pages (from-to)365-374
Number of pages10
JournalJournal of Cell Biology
Volume121
Issue number2
StatePublished - 1993
Externally publishedYes

Fingerprint

Basal Bodies
Chlamydomonas
Chlamydomonas reinhardtii
Cell Fusion
Sulfamethoxazole Drug Combination Trimethoprim
Germ Cells
Cell Communication
Signal Transduction
Calcium
Membranes
Pharmaceutical Preparations

ASJC Scopus subject areas

  • Cell Biology

Cite this

Goodenough, U. W., Shames, B., Small, L., Saito, T., Crain, R. C., Sanders, M. A., & Salisbury, J. L. (1993). The role of calcium in the Chlamydomonas reinhardtii mating reaction. Journal of Cell Biology, 121(2), 365-374.

The role of calcium in the Chlamydomonas reinhardtii mating reaction. / Goodenough, U. W.; Shames, B.; Small, L.; Saito, T.; Crain, R. C.; Sanders, M. A.; Salisbury, Jeffrey L.

In: Journal of Cell Biology, Vol. 121, No. 2, 1993, p. 365-374.

Research output: Contribution to journalArticle

Goodenough, UW, Shames, B, Small, L, Saito, T, Crain, RC, Sanders, MA & Salisbury, JL 1993, 'The role of calcium in the Chlamydomonas reinhardtii mating reaction', Journal of Cell Biology, vol. 121, no. 2, pp. 365-374.
Goodenough UW, Shames B, Small L, Saito T, Crain RC, Sanders MA et al. The role of calcium in the Chlamydomonas reinhardtii mating reaction. Journal of Cell Biology. 1993;121(2):365-374.
Goodenough, U. W. ; Shames, B. ; Small, L. ; Saito, T. ; Crain, R. C. ; Sanders, M. A. ; Salisbury, Jeffrey L. / The role of calcium in the Chlamydomonas reinhardtii mating reaction. In: Journal of Cell Biology. 1993 ; Vol. 121, No. 2. pp. 365-374.
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