The Potential Effect of Vitamin D Supplement on Selected Coagulability Predictors in Vape-Exposed Female Rats

This study demonstrates that while vaping induces acute inflammation and coagulation abnormalities in female rats, high-dose vitamin D supplementation significantly mitigates these adverse effects on blood markers and organ pathology while also reducing nicotine and cotinine levels.

The Gist

The Big Picture: A "Smoke Test" for Rats

Imagine your body is a busy city. Vaping is like a sudden, toxic smog rolling into that city. It clogs the streets, angers the citizens (your cells), and makes the traffic police (your blood clotting system) go into a panic.

This study asked a simple question: If we give the city a powerful "cleaning crew" (Vitamin D), can it fix the mess caused by the smog?

The researchers used 42 female rats as their test subjects. They didn't just watch them; they put them in a special "smog chamber" to vape for three months. Then, they split the rats into groups: some got no help, some got a low dose of Vitamin D, and some got a massive dose of Vitamin D.

The Story of the Three Months

Month 1: The Panic Attack

When the rats first started vaping, their bodies went into shock.

• The Analogy: Think of the rats' blood like a river. Suddenly, the river got clogged with debris (clotting factors) and the water turned muddy (inflammation).
• What happened: Their "clotting alarms" (D-dimer, Factor X, and Thrombomodulin) went off the charts. Their lungs started to look like they had a severe infection (necrotic pneumonia). It was a chaotic mess.

Month 3: The Body Adapts (Sort Of)

After three months of constant vaping, something interesting happened. The rats' bodies started to get used to the smog.

• The Analogy: Imagine living next to a construction site. The first week is deafening. By month three, you've put on noise-canceling headphones. The blood clotting markers went down from their peak, suggesting the rats' bodies were trying to adapt to the stress.
• The Catch: Even though the numbers went down, the lungs were still damaged. The "smog" had left scars.

Enter the Vitamin D "Superhero"

This is where the study gets interesting. The researchers gave some of the vaping rats Vitamin D supplements to see if it could act as a shield.

1. The Low Dose (1,000 IU): The "Weak Shield"

• The Result: This was like giving the rats a tiny umbrella during a hurricane. It didn't do much. In fact, it sometimes made the inflammation slightly worse or didn't stop the damage.
• The Takeaway: A little bit of Vitamin D wasn't enough to fight off the heavy vaping stress.

2. The High Dose (50,000 IU): The "Heavy-Duty Firefighter"

• The Result: This was the game-changer. The rats getting the high dose of Vitamin D had much lower levels of inflammation and clotting markers. Their blood was cleaner, and their bodies were calmer.
• The Surprise: The high dose also seemed to lower the amount of nicotine and its byproducts (cotinine) in their blood. It was almost as if the Vitamin D helped the rats "detox" faster.
• The Catch: There was a weird side effect. In the rats only getting high-dose Vitamin D (without vaping), their immune systems got a little too excited, causing a "cytokine storm" (an overreaction). But, when the rats were already vaping, the high dose acted as a perfect balance, calming the storm caused by the vape.

The Damage Report (What the Microscope Saw)

The researchers looked at the rats' organs under a microscope:

• Lungs: The rats who vaped without Vitamin D had lungs that looked like they had suffered a severe bacterial infection and tissue death. The rats with the high-dose Vitamin D had lungs that were much healthier, though they still had some signs of bacterial pneumonia (perhaps because the high dose changed how their immune system fought bacteria).
• Liver: Surprisingly, the liver was tough! It didn't show much damage from the vaping, likely because rat livers are very good at repairing themselves.
• Kidneys: The kidneys showed some signs of stress and inflammation, especially in the groups that didn't get the right help.

The Bottom Line

Vaping is bad news. It turns your blood into a clotting factory and inflames your lungs.

However, Vitamin D is a powerful tool.

• A tiny dose does almost nothing.
• A huge dose acts like a shield, stopping the blood from clotting too much and calming the inflammation. It might even help the body clear out nicotine faster.

The Warning: Just like with any medicine, "more" isn't always better if you aren't sick. Giving high doses to healthy rats caused some immune overreactions. But for someone already exposed to the "smog" of vaping, a high dose of Vitamin D might be the life raft they need to keep their blood flowing smoothly and their lungs from collapsing.

In short: If you are vaping, your body is in a fight. Vitamin D (specifically a high dose) might be the extra muscle your body needs to win that fight, but it's not a magic wand that makes vaping safe.

Technical Summary

1. Problem Statement

The rising popularity of electronic cigarettes (e-cigarettes/vaping), particularly among young adults and women, has raised concerns regarding their long-term cardiovascular and inflammatory effects. While often marketed as safer alternatives to traditional smoking, emerging evidence suggests vaping may induce platelet aggregation, endothelial dysfunction, and thrombosis. Concurrently, Vitamin D (VD) deficiency is linked to increased thrombosis risk, while supplementation is hypothesized to possess anticoagulant and anti-inflammatory properties. However, there is a lack of data regarding:

• The specific impact of chronic vaping on coagulation predictors (D-dimer, Factor X, Thrombomodulin) and inflammatory markers (IL-6) in females.
• Whether Vitamin D supplementation can mitigate vaping-induced coagulopathy and inflammation.
• The histopathological consequences of vaping on the lungs, liver, and kidneys in this context.

2. Methodology

Study Design:
An in vivo experimental study using 42 female Wistar rats (12 weeks old) divided into six groups ($n=7$ per group) over a 12-week period.

Experimental Groups:

1. Control (C): No vaping, no VD treatment.
2. Vaping (EC): Exposed to vaping for 12 weeks (2 hours/day, 5 days/week), no VD.
3. Vaping + Low Dose VD (ECD1000): Vaping for 4 weeks, then vaping + 1,000 IU VD daily for 8 weeks.
4. Vaping + High Dose VD (ECD50,000): Vaping for 4 weeks, then vaping + 50,000 IU VD weekly for 8 weeks.
5. Low Dose VD (D1000): 1,000 IU VD daily for 8 weeks (no vaping).
6. High Dose VD (D50,000): 50,000 IU VD weekly for 8 weeks (no vaping).

Exposure Protocol:

• Device: VOOPOO DRAG M100S with 0.8 Ohm coil.
• E-liquid: VGOD "Berry Bomb" flavor (50% PG, 50% VG, 18 mg/mL nicotine).
• Chamber: 50x50 cm smoking chamber with air pump saturation and rest cycles mimicking user behavior.

Data Collection & Analysis:

• Timeline: Blood samples and histopathology collected at baseline, 1 month, and 3 months.
• Biochemical Markers:
  • Nicotine and Cotinine (LC-MS/MS).
  • Inflammatory/Coagulation: IL-6, D-dimer, Coagulation Factor X (FX), Thrombomodulin (TM) via ELISA.
  • Organ Function: ALT (liver) and Creatinine (kidney) via spectrophotometry.
• Histopathology: H&E staining of liver, kidney, and lung tissues.
• Statistics: Two-factor ANOVA with Tukey's post hoc test; Pearson correlation for nicotine vs. other parameters.

3. Key Contributions

• Temporal Dynamics of Vaping: The study elucidates the difference between acute (1-month) and chronic (3-month) vaping effects, showing an initial spike in coagulation markers followed by a partial physiological adaptation.
• Dose-Dependent Vitamin D Effects: It highlights a critical divergence in Vitamin D efficacy based on dosage. High-dose VD (50,000 IU) showed protective effects in vape-exposed rats, whereas low-dose VD (1,000 IU) appeared less effective or potentially pro-inflammatory in certain contexts.
• Nicotine Detoxification Link: The study provides evidence that Vitamin D supplementation correlates with reduced systemic nicotine and cotinine levels in vape-exposed subjects.
• Histopathological Correlation: It links biochemical markers (e.g., TM levels) directly to tissue damage (necrotic pneumonia), offering a mechanistic explanation for the observed biomarker fluctuations.

4. Key Results

Biochemical Findings:

• Acute Phase (1 Month): Vaping caused a significant acute surge in D-dimer (4402 ng/mL), FX (1.87 μg/mL), and TM (34.71 ng/mL), indicating immediate hypercoagulability and endothelial stress.
• Chronic Phase (3 Months): In the vaping-only group (EC), these markers decreased significantly from the 1-month peak, suggesting physiological adaptation, though nicotine and cotinine levels continued to rise.
• Vitamin D Intervention:
  • High Dose (ECD50,000): Significantly reduced IL-6, D-dimer, and FX levels compared to the EC group. It also resulted in the lowest nicotine/cotinine levels among vape groups.
  • Low Dose (ECD1000): Showed less efficacy; IL-6 levels remained higher than the high-dose group.
  • Non-Vaping VD Groups: Interestingly, the non-vaping group receiving high-dose VD (D50,000) exhibited significantly higher IL-6 levels, suggesting a pro-inflammatory response to high-dose VD in healthy subjects under stress conditions.

Organ Function & Histopathology:

• Lungs:
  • EC Group: Necrotic pneumonia with alveolar hemorrhage and disrupted walls.
  • ECD50,000 Group: Developed bacterial pneumonia (neutrophil infiltration), potentially due to altered innate immunity or receptor differences in rodents.
  • D1000 Group: Diffuse interalveolar hemorrhage.
• Liver: No major histopathological differences or significant fibrosis/necrosis across groups, likely due to the high regenerative capacity of Wistar rat livers.
• Kidneys: Evidence of immune-related injury (glomerulonephritis) in the ECD1000 group, characterized by mesangial expansion and focal crescent formation, correlating with elevated creatinine and IL-6.

Correlations:

• No significant correlation was found between nicotine levels and other measured parameters (IL-6, D-dimer, etc.), suggesting that other vape aerosol components (flavorings, thermal decomposition products) drive the inflammatory and coagulation responses.

5. Significance and Conclusion

• Therapeutic Potential: High-dose Vitamin D supplementation (50,000 IU/week) appears to mitigate vaping-induced inflammation and coagulopathy in female rats, potentially aiding in nicotine detoxification.
• Risk of Low Dose: Low-dose supplementation (1,000 IU/day) may be insufficient to counteract vaping-induced stress and could potentially exacerbate inflammatory markers in specific contexts.
• Safety Warning: High-dose Vitamin D in non-vaping (healthy) subjects induced a pro-inflammatory cytokine response, indicating that dosage must be carefully calibrated based on the physiological state (stress/inflammation vs. health).
• Clinical Implication: The findings suggest that Vitamin D status is a critical factor in the cardiovascular risk profile of e-cigarette users, warranting further investigation into targeted supplementation strategies for this population.

Note: As this is a preprint (bioRxiv), the findings have not yet undergone formal peer review.