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Skunk musk causes methemoglobin and Heinz body formation in vitro
Brittney R Fierro1, Dalen W Agnew, Ann E Duncan
1Pathobiology and Diagnostic Investigation, Michigan State University, East Lansing, MI, USA.
Background:
A captive Red Panda developed a regenerative anemia with Heinz bodies after being sprayed by a skunk. A definite cause-and-effect relationship between skunk musk and oxidative erythrocyte damage has not been reported, but it was suspected in one reported case of a dog with Heinz body hemolytic anemia.
Objective:
The objective was to determine whether skunk musk induces oxidative HGB damage in vitro.
Methods:
Plasma and RBC were harvested from heparinized blood of 3 dogs, 3 cats, and a Red Panda. Skunk musk was solubilized in ethanol and mixed with plasma from each species to make stock solutions of 4% musk and 4% ethanol. Aliquots of RBC were resuspended in autologous stock solutions and solvent controls to yield musk concentrations of 0%, 0.04%, and 0.4% (by volume). Aliquots were incubated at 37°C for 4-72 hours and assessed for oxidative damage by visual inspection, optical absorbance spectroscopy, transmission electron microscopy, and light microscopy after Wright and vital New Methylene Blue staining.
Results:
Dose-dependent brown color and absorption changes characteristic of methemoglobin were present by 4 hours and increased over 24 hours (Red Panda) and 72 hours (dog and cat). Similarly, there were time-dependent (all species) and dose-dependent (dog and cat) increases in the number of Heinz bodies, which were present by 4 hours and numerous by 24 hours.
Conclusions:
In vitro, skunk musk causes Heinz body and methemoglobin formation in canine, feline, and Red Panda RBC, supporting the clinical association between Heinz body hemolytic anemia and skunk spray exposure.
Insights
Skunk musk causes oxidative damage to red blood cells (RBCs) in dogs, cats, and Red Pandas, leading to Heinz body and methemoglobin formation. This supports the link between skunk spray and hemolytic anemia.
Area of Science:
- Veterinary Medicine
- Toxicology
- Hematology
Background:
- A Red Panda developed anemia with Heinz bodies after skunk spray exposure.
- The causal link between skunk musk and oxidative erythrocyte damage was previously unconfirmed.
- A dog case suggested skunk musk might induce Heinz body hemolytic anemia.
Purpose of the Study:
- To investigate if skunk musk induces oxidative damage to hemoglobin (HGB) in vitro.
- To assess the direct effects of skunk musk on red blood cells across different species.
Main Methods:
- Red blood cells (RBCs) and plasma from dogs, cats, and a Red Panda were incubated with solubilized skunk musk.
- Various concentrations of skunk musk (0% to 0.4%) were used, with incubations lasting 4-72 hours.
- Oxidative damage was evaluated using spectroscopy, microscopy, and staining techniques.
Main Results:
- Skunk musk induced dose- and time-dependent formation of methemoglobin (indicated by brown color and absorption changes).
- Heinz bodies, characteristic of oxidative damage, increased over time and with musk concentration in all species.
- These effects were observed in canine, feline, and Red Panda RBCs.
Conclusions:
- Skunk musk directly causes Heinz body and methemoglobin formation in vitro across multiple species.
- This in vitro evidence supports the clinical observation of Heinz body hemolytic anemia following skunk spray exposure.
- The study confirms skunk musk as a causative agent of oxidative erythrocyte damage.
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