Article ; Online: Gender susceptibility to COVID-19: a review of the putative role of sex hormones and X chromosome.
Journal of endocrinological investigation
2020 Volume 44, Issue 5, Page(s) 951–956
Abstract: Background: The recent emergence of COVID-19 poses a global health emergency. One of the most frequently reported data is sex-related severity and mortality: according to the last available analysis on 239,709 patients in Italy, lethality is 17.7% in ... ...
Abstract | Background: The recent emergence of COVID-19 poses a global health emergency. One of the most frequently reported data is sex-related severity and mortality: according to the last available analysis on 239,709 patients in Italy, lethality is 17.7% in men and 10.8% in women, with 59% of total deaths being men. Interestingly, the infection rate is lower in males than in females, with 45.8% and 54.2% of positive cases, respectively, suggesting that gender-related factor may worsen disease evolution. A tentative hypothesis to explain these findings is the role of angiotensin-converting enzyme 2 (ACE2) and serine protease TMPRSS2 involved in viral infection. Purpose: In this review, we summarize the available evidence pointing to gender-related differences in ACE2 and TMPRSS2 expression, from both genetic and endocrine points of view. Results: Altogether, available evidence points toward two not-mutually exclusive mechanisms in gender susceptibility to COVID-19 by sex hormonal regulation of ACE2 and TMPRSS2. On one hand, ACE2 expression could be increased in women, either by estrogens or constitutively by X chromosome inactivation escape or by reduced methylation, providing a larger reservoir of ACE2 to maintain the fundamental equilibrium of RAS regulatory axis. On the other, low levels of androgens in women may keep at low levels TMPRSS2 expression, representing a further protective factor for the development of COVID-19 infection, despite the increased expression of ACE2, which represents the Trojan horse for SARS-CoV-2 entry. Conclusions: Both mechanisms consistently point to the role of sex hormones and sex chromosomes in the differential severity and lethality of COVID-19 in men and women. |
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MeSH term(s) | Angiotensin-Converting Enzyme 2/blood ; Angiotensin-Converting Enzyme 2/genetics ; COVID-19/epidemiology ; COVID-19/genetics ; Chromosomes, Human, X/genetics ; Female ; Genetic Predisposition to Disease/epidemiology ; Gonadal Steroid Hormones ; Humans ; Male ; Serine Endopeptidases/blood ; Serine Endopeptidases/genetics ; Sex Characteristics ; Sex Factors |
Chemical Substances | Gonadal Steroid Hormones ; ACE2 protein, human (EC 3.4.17.23) ; Angiotensin-Converting Enzyme 2 (EC 3.4.17.23) ; Serine Endopeptidases (EC 3.4.21.-) ; TMPRSS2 protein, human (EC 3.4.21.-) |
Keywords | covid19 |
Language | English |
Publishing date | 2020-09-16 |
Publishing country | Italy |
Document type | Journal Article ; Review |
ZDB-ID | 432272-1 |
ISSN | 1720-8386 ; 0391-4097 ; 1121-1369 |
ISSN (online) | 1720-8386 |
ISSN | 0391-4097 ; 1121-1369 |
DOI | 10.1007/s40618-020-01383-6 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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