1Department of Respiratory and Critical Care Medicine, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, 322000, Zhejiang, Peoples Republic of China; 2Department of Respiratory Medicine, Affiliated Jinhua Hospital, Zhejiang University School of Medicine, Jinhua Municipal Central Hospital, Jinhua, 321000, Zhejiang, Peoples Republic of China
Correspondence: Saibin WangDepartment of Respiratory Medicine, Affiliated Jinhua Hospital, Zhejiang University School of Medicine, Jinhua Municipal Central Hospital, Jinhua, 321000, Zhejiang Province, Peoples Republic of ChinaTel +86 579 82552278Fax +86 579 82325006Email [emailprotected]
Purpose: Sleep duration is associated with aging. However, the relationship between sleep duration and the concentration of the protein klotho in the serum remains unknown in the general population of the United States. Hence, this study aimed at exploring the association between them.Methods: Participants whose data included klotho protein and sleep duration variables in the National Health and Nutrition Examination Survey data from 2007 to 2016 were utilized for this analysis.Results: Sleep duration was non-linearly associated with the level of klotho protein in the serum, with a negative association between sleep duration and serum klotho concentration after adjusting for confounding variables ( = 7.6; 95% CI: 11.3, 4.0; P 7.5 hours) revealed that the serum klotho of the participants in the highest tertile (> 7.5 hours) was 21.9 pg/mL lower (95% CI: 38.6, 5.2; P = 0.01) than those in the lowest tertile (Conclusion: Our results revealed that people who sleep more than 7.5 hours per night have decreased levels of the anti-aging protein klotho in their serum, thus being more at risk of aging-related syndromes.
The sleep duration recommended by the National Sleep Foundation in 2015 was as follows: 79 hours in young people and adults, and 78 hours in elderly people. Excessive or insufficient sleep duration is disadvantageous for health. Previous studies have shown that sleep duration is associated with cardiovascular disease, cognitive decline, and metabolic syndrome,13 and aging.4
Klotho protein is a multifunctional protein encoded by the klotho gene, and its expression level is associated with aging.5 Kuro-o found that mice lacking klotho suffer from premature aging syndrome,6 the lack of klotho in serum is also associated with heart aging,7,8 and decreased klotho levels are found in patients with various aging-related diseases, such as metabolic syndrome, cancer, and hypertension.911 In contrast, high level of klotho prolongs lifespan.6
Aging is an inevitable process for human beings. Although there is a fixed limit to human life span,12 the speed of aging is affected by many factors. Aging is affected by environmental, genetic, and epigenetic factors.13 On the other hand, the expression level of klotho may be potentially involved in the relationship between sleep duration and aging. Sleep disorders and aging are common public health problems, and the potential association between sleep duration and the anti-aging protein klotho is largely unexplored. Therefore, the purpose of this study was to investigate the potential association between them using the data of the National Health and Nutrition Examination Survey (NHANES) from 2007 to 2016, performed in the population of the United States. Our hypothesis is that sleep duration is associated with the serum anti-aging protein klotho concentration.
The NHANES contains the data related to the anti-aging protein klotho for the following 5 cycles: 20072008, 20092010, 20112012, 20132014, 20152016. In this study, the National Center for Health Statistics was used to merge the publicly available documents of the 5 cycles of NHANES.
A total of 13,765 participants included in the NHANES database who had klotho in the serum measured from 2007 to 2016 were included in this study. Sleep indicators were considered for those participants who measured klotho.
The serum klotho concentration in the participants was measured using a commercially available Enzyme Linked Immunosorbent Assay (ELISA) kit produced by Immuno-Biological Laboratories international in Japan. The serum samples of the participants were received on dry ice and stored at 80C until analysis. The samples were analyzed in duplicate, and the mean of the two values was used to calculate the final value. Two quality control samples containing low and high concentrations of klotho protein were also analyzed in duplicate by ELISA. Samples with more than 10% repeated results were considered as repeated analysis. If the values of the quality control samples were not within the 2SD range of the specified value, the entire analysis was discarded, and the sample analysis was repeated.
The following self-reported outcomes related to sleep such as sleep duration and trouble sleeping were collected. These questions were asked at home by trained interviewers using the computer-assisted personal interview system.
Sleep duration: According to the questionnaire about the sleeping habits of the participants, the mean sleep duration per night was asked. The range of sleep duration was 112 hours, and the value of more than 12 hours was defined as 12 hours.
Trouble sleeping: Participants were asked whether they informed the doctor about their trouble sleeping. The answer to this question was divided into Yes or No.
Information about age (years), gender, race, education level, marital status, and income level was obtained from the demographic documents. Race was divided into Mexican American, other Hispanic, non-Hispanic white, non-Hispanic black, and other races. Education was divided into <9th grade, 911th grade, high-school grade, college, and college graduate. The marital status was classified as follows: married, widowed, divorced, separated, never married, living with partner. The income level was based on the poverty income ratio, which was considered as a continuous variable in this study. Body mass index (BMI) was obtained from the examination document. Participants who smoke at least 100 cigarettes in their lifetime were considered as smokers. Alcohol use was defined as the consumption of at least 12 cups of alcoholic beverages in the last 12 months. The information regarding the presence of diabetes, hypertension, coronary heart disease, stroke, liver disease, and cancer were obtained from the questionnaire.
Detailed information about klotho, sleep-related variables and covariates is available at http://www.cdc.gov/nchs/nhanes/.
Statistical analysis was performed using R software (The R Foundation; https://www.r-project.org). The factors that influence the levels of klotho in the serum were detected using the univariate analysis. The association between sleep duration and serum klotho levels was assessed using multiple regression model. The threshold effect of sleep duration on serum klotho levels and the smoothing function were calculated using piecewise linear regression. The potential bias of the results due to the use of indicator variables with missing data was assessed by multiple imputation analysis.14
Two adjustment models were evaluated for the levels of klotho in the serum: the adjusted model I, which included variables in which the regression coefficients changed >10% after the basic model was introduced or removed from the full model (age, race); the model II, which included variables in the model I and the regression coefficient of covariable to dependent variable of P < 0.1 (age, race, gender, education level, marital status, smoking, alcohol use, hypertension, coronary heart disease, stroke, liver disease, cancer).15 A value of P < 0.05 was considered to be statistically significant.
The baseline characteristics of the study population are listed in Table 1. The mean age of the participants was 57.7 10.9 years, and 51.6% were females. The mean sleep duration of the participants was 6.9 1.5 hours, and 29.5% of them had trouble sleeping. The mean serum klotho concentration was 854.3 308.2 pg/mL.
Table 1 Baseline Characteristics of the Study Participants
A univariate analysis of the potential influencing factors of the serum klotho level shown in Table 2 revealed that the concentration of klotho protein in the serum decreased when sleep duration increased (P<0.001). In addition, trouble sleeping, age, gender, race, education level, marital status, smoking, alcohol use, hypertension, coronary heart disease, stroke, liver disease, and cancer were associated with the levels of klotho in the serum.
Table 2 Univariate Analysis of Influencing Factors of the Serum Klotho Level
The correlation of the smooth curve fitting suggested a non-linear association between sleep duration and the level of klotho in the serum (Figure 1), and a two-piece linear regression model revealed an inflection point of 5.5 hours (Table 3). The multiple regression analysis shown in Table 4 after adjustment for model I and model II revealed a negative association between sleep duration and the concentration of klotho in the serum in the non-adjustment model ( =11.1; 95% CI: 14.5, 7.6; P<0.001), adjustment model I ( =7.3; 95% CI: 10.8, 3.8; P<0.001) and adjustment model II ( =7.6; 95% CI: 11.3, 4.0; P<0.001). The conversion of the sleep duration from a continuous variable to a categorical variable (tertile: T1: <5.5 hours; T2: 5.57.5 hours; T3: >7.5 hours) revealed that the level of klotho in the serum of the participants in the highest tertile (>7.5 hours) was 21.9 pg/mL (95% CI: 38.6, 5.2; P=0.010) lower than that in the lowest tertile (<5.5 hours). No statistical difference on the concentration of klotho in the serum of the participants was observed between the middle tertile (5.57.5 hours) and the lowest tertile (<5.5 hours) ( = 3.9; 95% CI: 12.1, 20.0; P=0.633). Substitution analysis yielded consistent results, including multiple imputation of missing variables.
Table 3 Threshold Effect Analysis of Sleep Duration on Serum Klotho Using the Two-Piecewise Regression Model
Table 4 Multivariate Regression Analysis of the Association Sleep Duration (Hours) and Serum Klotho (pg/mL)
Figure 1 The fitted smooth curve showed the association between sleep duration and serum klotho levels after adjusting the relative confounding factors (age, race, gender, education level, marital status, smoking, alcohol use, hypertension, coronary heart disease, stroke, liver disease, cancer). The area between the dotted lines represents the 95% confidence interval.
To our knowledge, this work is the first reporting on the association between sleep duration and serum anti-aging protein klotho concentration in the general population of the United States. A nonlinear association between sleep duration and serum klotho level was found. The levels of klotho protein in the serum of the participants whose sleep duration was more than 7.5 hours showed a downward trend as the duration of sleep increased.
Klotho protein is a one-way transmembrane protein, mainly including -klotho and -klotho forms performing different functions.5,16 -Klotho is a multifunctional protein regulating the metabolism of phosphate, calcium and vitamin D,5 while -klotho is involved in key metabolic processes in various tissues.16 Although klotho gene expression is tissue specific,17,18 klotho gene defects cause systemic phenotypes,17 while klotho protein inhibits aging,19 suggesting that klotho protein may be involved in the regulation of the endocrine system. Mice lacking the klotho gene or fibroblast growth factor 23 show phosphate retention and premature aging syndrome, revealing that phosphate metabolism disorders may be the mechanism between klotho gene and aging.20 This evidence was used in this study as a basis to evaluate klotho protein in the serum as an aging-related marker.
Inappropriate sleep duration mainly determines the imbalance between the two sympathetic nervous systems and the hypothalamicpituitaryadrenal axis.21 Moderate sleep duration is crucial for health.22 Insufficient sleep is a public health epidemic as revealed by the United States Centers for Disease Control (www.cdc.gov/features/dssleep/). Insomnia and excessive sleep duration are both involved in the risk of inflammatory and infectious diseases, which in turn cause all-cause mortality.2326 In addition, sleep duration is also associated with some diseases related to aging, and an inverted U-shaped association exists between sleep duration and cognitive aging.27 Insufficient sleep time is independently associated with an increased risk of atherosclerosis,1 and both insufficient and excessive sleep duration are related to an increased risk of cardiovascular disease.28,29 Elderly people with excessive sleep duration have a higher prevalence of stroke compared with elderly people with a sleep duration less than 9 hours.30 These studies revealed that inappropriate sleep duration is a very common and critical public health problem, but it is still overlooked, despite being easy to diagnose and treat. Our study demonstrated that excessive sleep duration (>7.5 hours) was associated with a significant decrease in the anti-aging protein klotho, which is consistent with the previous evidence that excessive sleep duration causes aging.
In a randomized controlled study of 74 participants, Mochn-Benguigui et al report that sleep duration adjusted for fat mass and lean mass index was positively associated with soluble klotho levels.31 In comparison, the results of 13,765 American general population included in our work showed that serum klotho levels increased with sleep duration when sleep duration was within 5.5 hours after adjusting for confounding factors. This is consistent with the conclusion of Mochn-Benguigui et al. However, serum klotho levels were negatively correlated with sleep duration when sleep duration exceeded 7.5 hours. It revealed that excessive sleep duration may be detrimental to the level of serum anti-aging protein klotho. Although previous studies have already demonstrated that sleep duration is related to aging, no studies have reported the relationship between sleep duration and serum anti-aging protein klotho as we did in this work. Our research offers an additional evidence of sleep duration on aging by providing for the first time the relationship between sleep duration and the levels of klotho protein in the serum in the general population of the United States.
This study had several limitations. First of all, this analysis lacked participants sleep details and sleep perception, which may influence the relationship between sleep duration and the concentration of klotho protein in the serum. Secondly, this study was a cross-sectional study. The causal association between sleep duration and serum klotho levels was not evaluated because of time constraints. Thus, the sleep duration was reported by the participants, with inevitable reported bias. Thirdly, this study may also be disturbed by other uncontrollable factors. For example, Pk et al pointed out that lower plasma klotho levels were observed in patients with obstructive sleep apnea (OSA).32 In addition, Oliveira et al found that the concentration of klotho decreased in the cerebrospinal fluid of narcolepsy patients.33 In our study population, whether the participants suffered from these diseases (eg, OSA, narcolepsy) and the proportion of these patients were unknown because such information was not available in the raw data. However, the evaluation was adjusted for several possibly important confounding factors (age; race; gender; education level; marital status; smoking; alcohol use; hypertension; coronary heart disease; stroke; liver disease; cancer). Moreover, this study used data from a large national survey in the United States (NHANES) from 2007 to 2016, which has a large sample size and random sampling, and a good representation of the general population in the United States.
Our study revealed that sleep duration was non-linearly related to the serum anti-aging protein klotho. Indeed, the level of the anti-aging protein klotho in the serum showed a significant downward trend when sleep duration exceeded 7.5 hours, thus being more at risk of aging-related syndromes. Therefore, these people should monitor the level of the anti-aging protein klotho in the serum. Further well-designed prospective studies are needed to evaluate the effect of sleep duration on the anti-aging protein klotho to better understand the impact of the results obtained in this work on health, considering the enormous influence of sleep disorders on public health.
NHANES, National Health and Nutrition Examination Survey; U, Uranium; OR, Odds ratio; CI, Confidence interval; GINA, Global Initiative for Asthma; US, United States; U, uranium; Pb, Lead; Hg, Mercury; As, Arsenic; BMI, Body mass index; ICP-MS, Inductively coupled plasma mass spectrometry; PIR, Poverty-to-income ratio; TP. Total protein; ALT, Alanine aminotransferase; AST, Aspartate aminotransferase; BUN, Blood urea nitrogen; Scr, Serum creatinine; TB, Total bilirubin; SUA, Serum uric acid; Ba, Barium; Cd, Cadmium; Co, Cobalt; Cs, Cesium; Mo, Molybdenum; Sb, Antimony; Tl, Thallium; Tu, Tungsten; CKD-EPI, Chronic Kidney Disease Epidemiology Collaboration; GFR, Glomerular filtration rate; OSA, Obstructive sleep apnea.
All analyses were performed using R (The R Foundation; https://www.r-project.org) software and Empower (X&Y solutions, Inc., Boston, MA; http://www.empowerstats.com).
The data used in this study are publicly available on the Internet. https://www.cdc.gov/nchs/nhanes/.
Data analyzed in this study were from NHANES. Protocols involved were approved by the National Center for Health Statistics (NCHS) Research Ethics Review Board (ERB), and consent from all participants was documented. This study was a secondary analysis of the data, which was deemed exempt from review by the Ethics Committee of the Fourth Affiliated Hospital of Zhejiang University School of Medicine.
All authors consented for publication.
All authors contributed to data analysis, drafting or revising the article, have agreed on the journal to which the article will be submitted, gave final approval for the version to be published, and agree to be accountable for all aspects of the work.
This study was supported by the Medical and Health Science and Technology Plan Project of Zhejiang Province (No. 2020KY627).
The authors declare that they have no competing interests.
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Association between the anti-aging protein klotho with sleep | IJGM - Dove Medical Press
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- Who will get the call from Stockholm? It's time for STAT's 2022 Nobel Prize predictions - STAT - October 2nd, 2022 [October 2nd, 2022]
- Excision BioTherapeutics Awarded California Institute for Regenerative Medicine (CIRM) Grant to Support Ongoing Phase 1/2 Trial Evaluating EBT-101 as... - October 2nd, 2022 [October 2nd, 2022]
- NeuroVoices: Emma Ciafaloni, MD, on the Vast Expansion of Innovative Approaches to Duchenne Muscular Dystrophy - Neurology Live - October 2nd, 2022 [October 2nd, 2022]
- COVID mRNA Jabs and Testing Kicked Off This Industry of Drug Development: Here's What You Need to Know - The Epoch Times - October 2nd, 2022 [October 2nd, 2022]
- Kidney resident macrophages have distinct subpopulations and occupy distinct microenvironments - University of Alabama at Birmingham - October 2nd, 2022 [October 2nd, 2022]
- Nobel Prize for medicine: the full list of winners - The National - October 2nd, 2022 [October 2nd, 2022]
- The surprising link between circadian disruption and cancer may have to do with temperature - EurekAlert - October 2nd, 2022 [October 2nd, 2022]
- The global live cell imaging market is expected to grow at a CAGR of 8.44% during 2022-2027 - Yahoo Finance - October 2nd, 2022 [October 2nd, 2022]
- Chroma Medicine Announces Formation of Scientific Advisory Board of Global Experts in Gene Editing and Cell and Gene Therapy - PR Newswire - September 20th, 2022 [September 20th, 2022]
- Ring Therapeutics Announces Issuance of U.S. Patent for its Anellovector Compositions - Yahoo Finance - September 20th, 2022 [September 20th, 2022]
- Cholesterol gene mutation: Why would a healthy 27-year-old have severe heart problems? - 69News WFMZ-TV - September 20th, 2022 [September 20th, 2022]
- Gene Therapy for Severe Hemophilia B Could Be More Cost Effective Than Current Treatments - Managed Healthcare Executive - September 20th, 2022 [September 20th, 2022]
- AVROBIO Receives Rare Pediatric Disease Designation from U.S. Food and Drug Administration (FDA) for First Gene Therapy in Development for Cystinosis... - September 20th, 2022 [September 20th, 2022]
- The Biggest CGT Breakthroughs Through the Eyes of Our 2022 Power List - The Medicine Maker - September 20th, 2022 [September 20th, 2022]
- Leading Virus Researcher to Chair UVA's Department of Microbiology, Immunology and Cancer Biology - UVA Health Newsroom - September 20th, 2022 [September 20th, 2022]
- Work remains on Tay-Sachs and other Ashkenazi genetic disorders J. - The Jewish News of Northern California - September 20th, 2022 [September 20th, 2022]
- Study Shows Genetic Link to Moving to the Beat of Music - Newswise - September 20th, 2022 [September 20th, 2022]
- Viewpoint: In the post Roe v Wade world, what changes should a biology textbook writer make to address the medical repercussions of Dobbs? - Genetic... - September 20th, 2022 [September 20th, 2022]
- Alnylam Receives Approval in Europe for AMVUTTRA (vutrisiran) for the Treatment of Hereditary Transthyretin-mediated (hATTR) Amyloidosis in Adult... - September 20th, 2022 [September 20th, 2022]
- CSL flexes gene therapy muscle with latest drug - Sydney Morning Herald - September 20th, 2022 [September 20th, 2022]
- The MIT Press releases new book on the science of the heart from cardiac expert Dr. Sian Harding - EurekAlert - September 20th, 2022 [September 20th, 2022]
- Global Pharmaceutical Contract Manufacturing Market is projected to reach a market value of US$329.7 Billion in 2032: Visiongain Reports Ltd - Yahoo... - September 20th, 2022 [September 20th, 2022]
- Alzheon Reports Industry-Leading Biomarker, Brain Preservation and Clinical Effects Following 12 Months of Treatment in Phase 2 Trial of Oral ALZ-801... - September 20th, 2022 [September 20th, 2022]
- Do You Have Lung Cancer With An EGFR Mutation? If So, The Drug Tagrisso Might Be Right For You Based On New Results From A 'Practice Changing' Trial -... - September 20th, 2022 [September 20th, 2022]
- Getting rid of unwanted transformed cells: Possible new directions in cancer therapy - EurekAlert - September 20th, 2022 [September 20th, 2022]
- Sven Kili on reconvening with the ISCT - The Medicine Maker - September 14th, 2022 [September 14th, 2022]