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Correlation between osmoregulation and cell volume regulation.

The American Journal of Physiology

|April 1, 1987

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The blue crab Callinectes sapidus regulates its internal salt balance (osmoregulation) in low salinity but conforms to external salt levels in high salinity. This involves changes in hemolymph amino acids and cell volume regulation.

Area of Science:

Marine biology
Crustacean physiology
Osmotic regulation

Background:

Euryhaline crabs like Callinectes sapidus must adapt to varying salinities.
Osmoregulation and osmoconformation are key survival strategies in aquatic environments.
Cell volume regulation is crucial for maintaining cellular function under osmotic stress.

Purpose of the Study:

To investigate the relationship between whole-animal osmoregulation and cellular volume regulation in Callinectes sapidus.
To determine the role of hemolymph amino acids in the crab's osmotic adaptation.
To correlate in vivo and in vitro findings regarding osmotic stress responses.

Main Methods:

Equilibrating crabs in various saline concentrations (mosM).
Measuring hemolymph osmotic pressure and ion activity.

Related Experiment Videos

Analyzing hemolymph free amino acid concentrations (glycine, proline, taurine, alanine).

Studying cell volume regulation in vitro.

Main Results:

Callinectes sapidus acts as an osmoregulator below 800 mosM and an osmoconformer above it.
A strong correlation exists between whole-animal osmoregulation and in vitro cell volume regulation.
Hemolymph amino acid levels increase significantly (17-25 mM) when osmotic pressure drops below 850 mosM, primarily due to glycine, proline, taurine, and alanine.
Muscle cells lose free amino acids during in vitro cell volume regulation, suggesting this as the source for hemolymph increases.

Conclusions:

Cell volume regulation in vitro mirrors whole-animal osmoregulation in Callinectes sapidus.
Hemolymph amino acid accumulation is a critical response to osmotic stress, originating from muscle cells.
The crab employs sophisticated mechanisms to maintain cellular and organismal homeostasis across diverse salinities.