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Visualisation of Phosphate in Subcalicoblastic Extracellular Calcifying Medium and on a Skeleton of Coral by Using a Novel Probe, Fluorescein-4-Isothiocyanate-Labelled Alendronic Acid

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Abstract

The overload of nutrients of anthropogenic origin, including phosphate, onto coastal waters has been reported to have detrimental effects on corals. However, to the best of our knowledge, the phosphate concentration threshold for inhibiting coral calcification is unclear owing to a lack of information on the molecular mechanisms involved in the inhibitory effect of phosphate. Therefore, in this study, we prepared a new phosphate analogue, fluorescein-4-isothiocyanate (FITC)-labelled alendronic acid (FITC-AA), from commercially available reagents and used it as a novel probe to demonstrate its transfer pathway from ambient seawater into Acropora digitifera. When the juveniles at 1 d post-settlement were treated with FITC-AA in a laboratory tank, this phosphate analogue was found in the subcalicoblastic extracellular calcifying medium (SCM) and was absorbed on the basal plate in the juveniles within a few minutes. When the juveniles bear zooxanthellae at 3 months post-settlement, FITC-AA was observed on the corallite walls within a few minutes after adding ambient seawater. We concluded that FITC-AA in ambient seawater was transferred via a paracellular pathway to SCM and then absorbed on the coral CaCO3 skeletons because FITC-AA with a high polarity group cannot permeate through cell membranes.

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Acknowledgements

This research was supported by the Environment Research and Technology Development Fund (JPMEERF20194007) of the Environmental Restoration and Conservation Agency of Japan and by Grants-in-Aid from the Japan Society for the Promotion of Science (KAKENHI Grant Numbers 19K12310 and 20H03077), Research Laboratory on Environmentally-conscious Developments and Technologies (E-code) at the National Institute of Advanced Industrial Science and Technology (AIST), and by a Grant-in-Aid for Research Fellow of Japan Society for the Promotion of Science Grant Number 21J01671.

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MI and KY conceived and designed the study; MI, JY, AI, and MY-H collected juvenile corals; KM-Y analysed the chemical structure; NM, AS, MJ, and SW coordinated the study and helped draft the manuscript. All authors gave final approval for publication and agreed to be held accountable for the work performed therein.

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Correspondence to Ko Yasumoto.

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We have been allowed to harvest corals by Okinawa Prefectural Permits (numbers: 30–32, 31–43).

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Iijima, M., Yasumoto, J., Mori-Yasumoto, K. et al. Visualisation of Phosphate in Subcalicoblastic Extracellular Calcifying Medium and on a Skeleton of Coral by Using a Novel Probe, Fluorescein-4-Isothiocyanate-Labelled Alendronic Acid. Mar Biotechnol 24, 524–530 (2022). https://doi.org/10.1007/s10126-022-10115-1

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