Our study discovered a significant difference in DHEAS levels between COVID-19 patients and controls, reaffirming our earlier findings 13. In contrast to our previous study, which focused solely on samples from Tehran, the current longitudinal study expanded its sample selection to include COVID-19 patients from various provinces in Iran, offering a more comprehensive representation and a better understanding of temporal dynamics and potential trends of the diseases. Additionally, we considered gender as an important factor during our analysis, recognizing potential variations in DHEAS levels based on the participants' sex. Moreover, we explored the relationship between DHEAS levels and comorbidities, seeking to identify any correlations between DHEAS and other health conditions in COVID-19 patients, contributing to a broader understanding of the complexities of this disease.
Our data suggest that DHEAS levels may decrease under the influence of COVID-19 infection, especially in hospitalized subjects. This viral infection presumably exerts a notable influence on DHEAS levels in those individuals who require hospitalization for the management and treatment of their illness. However DHEAS does not appear to be strongly associated with mortality, or the need for intensive care. Indeed, our data suggests that although DHEAS levels correlate with disease severity, the association between DHEAS levels and disease severity may be attenuated or modified in the ICU setting. Factors specific to the intensive care environment, such as the severity of illness, interventions, or treatments, may contribute to this observed difference. According to Das et al's study, individuals with moderate to severe COVID-19 displayed a greater incidence of hypocortisolism and lower levels of DHEAS in comparison to those with mild disease 14. Further research is warranted to explore the underlying mechanisms and potential implications of this finding, shedding light on the relationship between DHEAS levels, disease severity, and the impact of ICU care on DHEAS dynamics. However, a report rejected a direct effect of COVID-19 on the HPA axis or the adrenal cortex because of the absence of variations in the circulating levels of ACTH, aldosterone, and DHEA between COVID-19 patients and controls 15.
In general, women have significantly lower levels of DHEAS compared to men. This difference in DHEAS levels between genders is primarily attributed to the influence of sex hormones, such as testosterone and estrogen, which regulate the production of DHEAS 16. Our evaluation of DHEAS levels in affected and control males and females demonstrated a significant gender disparity in DHEAS levels, with females exhibiting significantly lower levels compared to males. Furthermore, the analysis revealed a clear and significant difference in DHEAS levels between male and female inpatients. However, this significant difference was not observed among inpatients admitted to ICU care, suggesting that ICU care may have influenced the DHEAS levels in both males and females. To accurately assess the disparity in DHEAS levels between control individuals and patients, as well as between inpatients and outpatients, it is imperative to conduct gender-specific comparisons by matching females with females and males with males. While no significant difference in DHEAS levels was found between the females of the control group and the patients, a significant decrease was observed in males of the patients than control. This indicates that DHEAS levels may be used as a biomarker and play a role in differentiating between male patients and control males. Therefore, our findings highlight gender-based variations in DHEAS levels and suggest that DHEAS levels may have implications for disease progression and severity in COVID-19 patients, particularly among males.
Hormonal deficiencies related to age, particularly in DHEA, could potentially have a substantial impact on morbidity and mortality among older individuals 17. Increased secretion of DHEA/DHEAS has been associated with better health outcomes in individuals and greater longevity in males 18. Typically, DHEAS levels exhibit a certain pattern with age, where they tend to decrease gradually as individuals grow older. Our scatter plot providing insights into the correlation between DHEAS and age shows a potential deviation from this expected pattern in the case of male patients with COVID-19, so that the slope of DHEAS changes versus age is slower. It suggests that the presence of the virus may alter the typical age-related decline in DHEAS levels in males. This gender-specific impact on the relationship between DHEAS levels, age, and COVID-19 necessitates further investigation to better understand the underlying mechanisms at play.
Additionally, we suggest a dynamic pattern in DHEAS levels throughout the course of COVID-19, with a significant decline early in the disease progression followed by a subsequent recovery towards normal levels. The initial significant decline in DHEAS levels during the early stages of COVID-19 could be attributed to various factors. It is well-established that viral infections, including COVID-19, can induce an acute stress response in the body, leading to alterations in hormonal regulation 19,20. This acute stress response may contribute to the temporary suppression of DHEAS production. As the disease progresses and the immune system mounts a response to combat the infection, we observe a subsequent recovery in DHEAS levels. This recovery phase may signify the restoration of hormonal balance as the body recovers from the acute stress response and the immune response starts to normalize. The recovery of DHEAS levels towards the normal range could indicate a positive prognostic factor, suggesting a favorable response to the infection. The dynamic nature of DHEAS levels during COVID-19 highlights the complexity of the disease and its impact on hormonal regulation. According to our findings, the inpatients experienced a prolonged decrease in DHEAS levels for up to 14 days, suggesting a gradual decline that might be associated with the severity of their condition or other factors related to hospitalization. In contrast, outpatients initially exhibited a decline in DHEAS concentration during the first three days, after which there was a noticeable and relatively rapid increase that eventually recovered to the control level. Indeed, the rate of change in DHEAS concentration for inpatients was notably slower than that observed in outpatients, indicating distinct physiological responses between these two groups. Therefore, DHEAS therapy may be a consideration for inpatients; however, a comprehensive evaluation of individual patient factors is essential before making any recommendations.
There was a statistically significant difference observed between the average age of COVID-19 patients and the control samples, indicating that age plays a role in the susceptibility to the disease. Furthermore, among the COVID-19 patients, the average age of inpatients was significantly higher compared to both outpatients and the control group. Therefore, advanced age is associated with a higher likelihood of experiencing more severe symptoms or complications. Several studies have explored the strong association between patients' age and the outcome of COVID-19 21. No significant difference was seen between the mean ages of inpatients with and without the need for intensive care. Accordingly, other factors than age such as comorbidities may also contribute to the decision for intensive care admission. However, the mean ages of inpatients who passed away were significantly higher than those who survived. Thus, the advanced age may be associated with increased mortality risk among COVID-19 inpatients.
Generally, The influence of social parameters and disparities between genders on disease incidence and severity is widely recognized 22. Gender-constructed behaviors in both men and women, along with sociocultural factors, have an impact on the likelihood of exposure to infections and the subsequent outcomes 23. Based on the current results there was no significant difference in age between males and females among both the patient and control samples. This lack of significant difference in age was observed consistently across different subgroups of the disease, including inpatients, outpatients, and ICU-care inpatients. Therefore, it is important to note that age does not play a significant role in the distribution of the disease across gender. The absence of a significant age difference between males and females across different disease subgroups suggests that other factors, such as comorbidities, genetic predisposition, environmental exposure, or lifestyle choices may play more prominent roles in the disease's onset and severity. However, the overall findings still underscore the significance of age in relation to disease severity, mortality, and its impact on COVID-19 patients.
However, we observed significant age discrepancies between males in both control and patient groups, but not between females. This age disparity was also evident when comparing the same sexes within the hospitalized and non-hospitalized groups. It seems essential to engage in gender-specific comparisons when conducting age-related analyses, especially when assessing control individuals versus patients or inpatients versus outpatients. By conducting gender-specific comparisons, researchers can mitigate confounding factors and gain a comprehensive understanding and meaningful interpretations of the influence of age on biological and physiological differences within distinct gender groups.
Chronic non-communicable diseases have been identified as noteworthy predisposing factors for SARS-CoV-2 infection, while also serving as prognostic indicators for severe COVID-19 and unfavorable outcomes, including the need for intensive care unit admission or mortality 24–26. Hypertension, HD, and DM stand out as a prevalent condition affecting a substantial number of individuals worldwide 27–32. However, the specific association between these diseases and the increased risk of acquiring SARS-CoV-2 infection, as well as the potential impact on the severity of COVID-19, remains unclear. Our data underscores the significant association between these diseases specially HTN, HD, and DM with the risk of SARS-CoV-2 infection and disease severity. Additionally, we sought to examine the impact of HTN, HD and DM on various factors, including DHEAS.
Among the patients included in our study, about 24.7% of patients in our study were identified as HTN positive, around 20.7% of patients suffered from DM, while some patients (12.9%) had a pre-existing HD. Furthermore, we observed a higher occurrence of HTN and DM among hospitalized patients compared to those treated as outpatients (2.27 and 2.33 times, respectively). This suggests that individuals with HTN and DM may be more prone to experiencing severe manifestations of the disease. In the case of pre-existing HD, a more significant number of inpatients had this condition, while a smaller percentage of outpatients had a history of HD (3.90 times).
A study mentioned that endogenous DHEAS levels are positively related to blood pressure levels and hypertension status [29]. Barbagallo et al. discovered evidence indicating that DHEAS has a direct impact on blood vessels, suggesting its ability to modulate intracellular calcium metabolism [30]. This finding implies that DHEAS may play a role in regulating vascular responsiveness to various hormonal stimuli that cause depolarization and constriction. The mechanism through which DHEAS exerts its effects on vascular function is not fully understood, but it has been suggested that it triggers the production of NO by endothelial nitric oxide synthase (eNOS) and stimulates the release of nitric oxide (NO) from vascular endothelial cells. NO is a key regulator of vascular function, and its release is associated with improved vascular function [31].
DHEA may act as a cardioprotective agent 33 and modulate cardiovascular signaling pathways, exert anti-inflammatory properties and help reduce inflammation in the cardiovascular system 34. However, studies on the link between DHEA and cardiovascular disease (CVD) have yielded inconsistent results, leading to debate and controversy. According to some meta-analyses, the average DHEAS levels in coronary heart disease (CHD) cases were significantly lower than those in controls. However, there was no significant association between DHEA levels and CHD risk, indicating a more modest connection than previously believed 35,36. Other studies have indicated that low serum levels of DHEA in men may raise the risk of CHD, though the connection between DHEAS and CHD is conflicting 37–39. In women, the associations of DHEA and DHEAS with CVD have also yielded inconsistent findings 40,41.
The relationship between endogenous DHEA and DM is a complex and still not fully understood topic. Decreased levels of DHEA have been linked to diabetes, impaired glucose tolerance, hyperglycemia, and insulin resistance 42. Additionally, in a study, higher serum DHEA levels were associated with a lower risk of type 2 diabetes 43. Based on a previous study, in men, lower DHEAS levels were associated with an increased risk of diabetes 44. However, plasma DHEAS was not found to be associated with incident type 2 diabetes in women 45. Another study reported that obese patients with diabetes had low or undetectable levels of urine DHEA 46. While DHEA has been cross-sectionally associated with impaired fasting glucose in postmenopausal women, no significant association with type 2 diabetes was observed 47.
Our findings underscore significantly decreased levels of DHEAS in COVID-19 patients with HTN, HD, and DM. Furthermore, these comorbidities played a substantial role in disrupting hormonal balance and decreasing DHEAS concentration particularly among outpatients. The immune system response to COVID-19, stress, and the presence of disease might collectively contribute to this decrease in DHEAS which require further investigation.
The severity of COVID-19 and/or the hospitalization could also override the influence of these comorbidities on DHEAS levels. COVID-19 inpatients often experience significant stress, inflammation, and receive various medications which can impact hormone levels 48. Additionally, the severity of the disease and the treatments given may dominate any influence that HTN, HD or DM alone might have on DHEAS levels which require further research.
However, our comprehensive analysis of the effects of HTN, DM, and HD on DHEAS levels in COVID-19 patients has revealed intriguing insights. We found that the interaction of HTN and changing in DHEAS level has a notable influence on disease severity. In contrast, our analysis did not reveal a similar conclusion for DM or HD. These findings underscore the distinct role of HTN as a moderator in the correlation of DHEAS and severity in the context of COVID-19 and suggest that the influence of this comorbidity on hormonal profiles may vary across different conditions.
Our result indicated a gender-specific difference in the hormonal response to COVID-19 among patients with hypertension. In males and females with HTN, the mean DHEAS concentrations were found to be similar between inpatients and outpatients especially in females. This suggests that hospitalization status does not influence DHEAS levels in these groups. However, among female patients without HTN, a notable difference was observed. The mean DHEAS concentration was lower for inpatients compared to outpatients. Among male patients without HTN, a same trend emerged that was not significant.
Additionally, the comparison between females without HTN and with HTN who received outpatient care showed a significant difference in DHEAS concentration. This suggests that the presence of HTN has a notable impact on DHEAS levels in female outpatients specifically. However, hypertension is known to be associated with various physiological changes in the body, including alterations in hormone production and regulation 49,50. It is possible that hypertension, particularly in female outpatients, may disrupt the normal production or metabolism of DHEAS, leading to lower DHEAS concentrations. The specific mechanisms through which hypertension affects DHEAS levels would require further investigation. Based on the information provided, there are distinct patterns in DHEAS concentrations between inpatients and outpatients, stratified by gender and the presence of hypertension. According to these findings, it is reasonable to suggest that HTN may act as a moderator in the relationship between hospitalization status and DHEAS levels, but this effect is more pronounced among female patients.