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Tuberculosis Pathogenesis, Infection Prevention and Treatment: Research and Reviews, Apuntes de Patología

This special issue in pathogens focuses on the characterization of mycobacterium tuberculosis (mtb) strains emerging in tb endemic countries and the mechanisms adopted by the bacteria to resist and adapt to antitubercular therapies. Research articles investigate the dynamics of the host immune response during mtb infection in hiv/tb co-infected patients, the genetic and phenotypic profile of mtb strains, and the evaluation of second line drug resistance among drug resistant mtb isolates. The issue also highlights the importance of dna metabolism as a target for tb drug discovery and the alterations of the metabolic profile occurring to mtb bacilli during anti-tubercular treatments.

Tipo: Apuntes

2020/2021

Subido el 11/04/2021

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pathogens
Editorial
Mycobacterium tuberculosis Pathogenesis, Infection
Prevention and Treatment
Riccardo Miggiano , Menico Rizzi and Davide M. Ferraris *
Department of Pharmaceutical Sciences, University of Piemonte Orientale, Via Bovio 6, 28100 Novara, Italy;
riccardo.miggiano@uniupo.it (R.M.); menico.rizzi@uniupo.it (M.R.)
*Correspondence: davide.ferraris@uniupo.it; Tel.: +39-0321375715
Received: 13 May 2020; Accepted: 15 May 2020; Published: 18 May 2020


Abstract:
Tuberculosis (TB) is an infectious disease caused by the bacterium Mycobacterium
tuberculosis (MTB) and it represents a persistent public health threat for a number of complex
biological and sociological reasons. According to the most recent Global Tuberculosis Report (2019)
edited by the World Health Organization (WHO), TB is considered the ninth cause of death worldwide
and the leading cause of mortality by a single infectious agent, with the highest rate of infections and
death toll rate mostly concentrated in developing and low-income countries. We present here the
editorial section to the Special Issue entitled “Mycobacterium tuberculosis Pathogenesis, Infection
Prevention and Treatment” that includes 7 research articles and a review. The scientific contributions
included in the Special Issue mainly focus on the characterization of MTB strains emerging in TB
endemic countries as well as on multiple mechanisms adopted by the bacteria to resist and to adapt
to antitubercular therapies.
Keywords:
M. tuberculosis; tuberculosis; host-pathogen interactions; immune response; antitubercular
drug discovery; antitubercular treatments
Editorial
Tuberculosis (TB) is an infectious disease caused by the bacterium Mycobacterium tuberculosis
(MTB) and it represents a persistent public health threat for a number of complex biological and
sociological reasons. According to the most recent Global Tuberculosis Report (2019) edited by the
World Health Organization (WHO) [
1
], TB is considered the ninth cause of death worldwide and the
leading cause of mortality by a single infectious agent, with the highest rate of infections and death toll
rate mostly concentrated in developing and low-income countries. TB is also considered an impairing
factor for economic growth and for the improvement of the general public health in those countries,
as it drains human and financial resources that would otherwise be invested in the economy [
2
].
Hence, there is a pressing need to study and develop new prevention protocols and treatments for TB.
Public health policy makers, supranational organizations and governing bodies are currently joining
efforts in raising awareness in the general population regarding MTB contagion and in establishing
guidelines and protocols for fighting TB [
3
]. At the same time, pharmaceutical companies research new
therapies and approaches for finding new antitubercular diagnostics and treatments, the commercial
sustainability of which should not be overlooked in order to make antitubercular treatments accessible
and inclusive [4].
Research articles and the review published in this Special Issue entitled Mycobacterium tuberculosis
Pathogenesis, Infection Prevention and Treatment” mainly focus on the characterization of MTB
strains emerging in TB endemic countries as well as on multiple mechanisms adopted by the bacteria
to resist and to adapt to antitubercular therapies. The work of Mupfumi L. et al. investigates the
dynamics of the host immune response during MTB infection in HIV/TB co-infected patients, defining
Pathogens 2020,9, 385; doi:10.3390/pathogens9050385 www.mdpi.com/journal/pathogens
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pathogens

Editorial

Mycobacterium tuberculosis Pathogenesis, Infection

Prevention and Treatment

Riccardo Miggiano , Menico Rizzi and Davide M. Ferraris *

Department of Pharmaceutical Sciences, University of Piemonte Orientale, Via Bovio 6, 28100 Novara, Italy; riccardo.miggiano@uniupo.it (R.M.); menico.rizzi@uniupo.it (M.R.) ***** Correspondence: davide.ferraris@uniupo.it; Tel.: +39-

Received: 13 May 2020; Accepted: 15 May 2020; Published: 18 May 2020

 

Abstract: Tuberculosis (TB) is an infectious disease caused by the bacterium Mycobacterium

tuberculosis (MTB) and it represents a persistent public health threat for a number of complex

biological and sociological reasons. According to the most recent Global Tuberculosis Report (2019)

edited by the World Health Organization (WHO), TB is considered the ninth cause of death worldwide

and the leading cause of mortality by a single infectious agent, with the highest rate of infections and

death toll rate mostly concentrated in developing and low-income countries. We present here the

editorial section to the Special Issue entitled “Mycobacterium tuberculosis Pathogenesis, Infection

Prevention and Treatment” that includes 7 research articles and a review. The scientific contributions

included in the Special Issue mainly focus on the characterization of MTB strains emerging in TB

endemic countries as well as on multiple mechanisms adopted by the bacteria to resist and to adapt

to antitubercular therapies.

Keywords: M. tuberculosis; tuberculosis; host-pathogen interactions; immune response; antitubercular

drug discovery; antitubercular treatments

Editorial

Tuberculosis (TB) is an infectious disease caused by the bacterium Mycobacterium tuberculosis

(MTB) and it represents a persistent public health threat for a number of complex biological and

sociological reasons. According to the most recent Global Tuberculosis Report (2019) edited by the

World Health Organization (WHO) [ 1 ], TB is considered the ninth cause of death worldwide and the

leading cause of mortality by a single infectious agent, with the highest rate of infections and death toll

rate mostly concentrated in developing and low-income countries. TB is also considered an impairing

factor for economic growth and for the improvement of the general public health in those countries,

as it drains human and financial resources that would otherwise be invested in the economy [ 2 ].

Hence, there is a pressing need to study and develop new prevention protocols and treatments for TB.

Public health policy makers, supranational organizations and governing bodies are currently joining

efforts in raising awareness in the general population regarding MTB contagion and in establishing

guidelines and protocols for fighting TB [ 3 ]. At the same time, pharmaceutical companies research new

therapies and approaches for finding new antitubercular diagnostics and treatments, the commercial

sustainability of which should not be overlooked in order to make antitubercular treatments accessible

and inclusive [4].

Research articles and the review published in this Special Issue entitled “Mycobacterium tuberculosis

Pathogenesis, Infection Prevention and Treatment” mainly focus on the characterization of MTB

strains emerging in TB endemic countries as well as on multiple mechanisms adopted by the bacteria

to resist and to adapt to antitubercular therapies. The work of Mupfumi L. et al. investigates the

dynamics of the host immune response during MTB infection in HIV/TB co-infected patients, defining

Pathogens 2020 , 9 , 385; doi:10.3390/pathogens9050385 www.mdpi.com/journal/pathogens

the functional, activation, and differentiation profile of MTB-specific T-cells during antiretroviral

treatment [ 5 ]. The research article by Fursov et al. [ 6 ] investigates the genetic and phenotypic

profile of the MTB strain Rostov, belonging to the Central Asia Outbreak Clade (CAO) of the Beijing

genotype. This strain has been attributed to the pre-extensively drug-resistant (XDR) tuberculosis

group. In particular, the authors analyzed the growth rate and virulence of the Rostov strain in mice

models, and the experimental outputs were compared with the same characteristics of the MTB H37Rv

strain. However, mice infected with the Rostov strain did not show the formation of pulmonary

infiltrates, suggesting a lower activation of the host defense mechanisms compared with the response

to the infection caused by H37Rv strain.

The emergence and global spread of multidrug-resistant (MDR) as well as XDR MTB strains

requires the early detection of drug resistance to ensure a functional patient management. In this

context, Mogashoa and co-authors contribute to the Special Issue by presenting an evaluation of the

second line drug resistance among drug resistant MTB isolates in Botswana [ 7 ]. The study analyzed

57 clinical isolates demonstrating that 33 (58%) were MDR strains, 4 (7%) were additionally resistant to

flouroquinolones, and 3 (5%) were resistant to both fluoroquinolones and second-line injectable drugs.

Moreover, they detected the most conserved mutation conferring he resistance to fluoroquinolone

treatments, located on the gyrA gene with the alanine at position 90 mutated into valine (A90V).

For a definitive solution to the clinical management of drug-resistant tuberculosis, other innovative

drugs targeting alternative pathways are urgently needed taking into account the genes that are

essential for growth and survival of the bacilli in vitro [ 8 ], in macrophages [ 9 ] and in animal models

of infection [ 10 ]. Among these, alternative validated target pathways include DNA transcription,

targeted by rifampicin, protein synthesis, which is inhibited by oxazolidinones [ 11 ] and ATP synthesis

by Q203 [ 12 ] and bedaquiline [ 13 ]. Although the DNA metabolic pathway plays a key role in

mutagenesis events conferring bacterial drug resistance, a limited number of approved TB drugs target

DNA metabolism [ 14 ], which includes key enzymatic steps involved in nucleotides synthesis [ 14 – 18 ],

DNA replication [ 19 ] and repair [ 20 , 21 ]. As described by Uddin R. and collaborators [ 22 ], innovative

targets could be identified also by the computational subtractive genomics methods; indeed, the authors

presented a prioritized list of possible targets for drug discovery studies against Mycobacterium avium

sub. hominissuis. In addition to drug-resistance, research efforts should take into account alterations

of the metabolic profile occurring to MTB bacilli during anti-tubercular treatments. To this end,

the work of Bespyatykh et al. [ 23 ] demonstrates the occurrence of changes in bacterial metabolism

during TB therapy using multi-omics analysis of three consecutive MTB isolates from the same

patient. In particular, they observed a stepwise accumulation of polymorphisms related to phenotypic

resistance to fluoroquinolones and isoniazid and variations at the proteomic and transcriptomic

levels, in the loci associated with drug-resistance and virulence, that only partly can be explained by

mutagenic events on target genes. In support of this hypothesis, the work of Maslov D.A. showed

that mutations on a transcriptional regulator gene (MSMEG_1380) indirectly confer resistance to

tetrazines by inducing the overexpression of the mmpS5-mmpL5 operon that regulates drug efflux in

Mycobacterium smegmatis [24].

MTB pathogenicity is mainly based on (i) the capability of the bacilli of reprogramming host

macrophages after primary infection, preventing its own elimination; (ii) the formation of granulomas,

in which the pathogen survives in equilibrium with the host defense and (iii) the slowing control

of bacterial central metabolism and replication, characterizing the so called dormant state in which

MTB is resistant to host defenses and therapy. Since dormant bacilli could also reside in bone marrow

mesenchymal stem cells, as observed in post-chemotherapy mice models and clinical subjects, the paper

of Garhyan J. et al. [ 25 ] presents innovative bone-homing PEGylated liposome nanoparticles which

actively target the bone microenvironment leading to MTB clearance and reducing the relapse rate.

Concerning the macrophages reprogramming capability, Abdalla A.E. and co-authors contribute to the

Special Issue with a review discussing the multiple mechanisms adopted by MTB to interfere with

macrophage apoptosis [ 26 ]. In particular, they describe the anti-apoptotic determinants, listing the

  1. Pym, A.S.; Diacon, A.H.; Tang, S.J.; Conradie, F.; Danilovits, M.; Chuchottaworn, C.; Vasilyeva, I.; Andries, K.; Bakare, N.; De Marez, T.; et al. Bedaquiline in the treatment of multidrug- and extensively drug-resistant tuberculosis. Eur. Respir. J. 2016 , 47 , 564–574. [CrossRef]
  2. Miggiano, R.; Morrone, C.; Rossi, F.; Rizzi, M. Targeting genome integrity in mycobacterium tuberculosis: From nucleotide synthesis to DNA replication and repair. Molecules 2020 , 25 , 1205. [CrossRef]
  3. Donini, S.; Garavaglia, S.; Ferraris, D.M.; Miggiano, R.; Mori, S.; Shibayama, K.; Rizzi, M. Biochemical and structural investigations on phosphoribosylpyrophosphate synthetase from Mycobacterium smegmatis. PLoS ONE 2017 , 12 , e0175815. [CrossRef] [PubMed]
  4. Singh, V.; Donini, S.; Pacitto, A.; Sala, C.; Hartkoorn, R.C.; Dhar, N.; Keri, G.; Ascher, D.B.; Mondésert, G.; Vocat, A.; et al. The inosine monophosphate dehydrogenase, GuaB2, is a vulnerable new bactericidal drug target for tuberculosis. ACS Infect. Dis. 2017 , 3 , 5–17. [CrossRef] [PubMed]
  5. Park, Y.; Pacitto, A.; Bayliss, T.; Cleghorn, L.A.; Wang, Z.; Hartman, T.; Arora, K.; Ioerger, T.R.; Sacchettini, J.; Rizzi, M.; et al. Essential but not vulnerable: Indazole sulfonamides targeting inosine monophosphate dehydrogenase as potential leads against mycobacterium tuberculosis. ACS Infect Dis. 2017 , 3 , 18–33. [CrossRef]
  6. Donini, S.; Ferraris, D.M.; Miggiano, R.; Massarotti, A.; Rizzi, M. Structural investigations on orotate phosphoribosyltransferase from Mycobacterium tuberculosis, a key enzyme of the de novo pyrimidine biosynthesis. Sci. Rep. 2017 , 7 , 1180. [CrossRef] [PubMed]
  7. Reiche, M.A.; Warner, D.F.; Mizrahi, V. Targeting DNA replication and repair for the development of novel therapeutics against tuberculosis. Front. Mol. Biosci. 2017 , 4 , 75. [CrossRef] [PubMed]
  8. Ferraris, D.M.; Miggiano, R.; Rossi, F.; Rizzi, M. Mycobacterium tuberculosis molecular determinants of infection, survival strategies, and vulnerable targets. Pathogens 2018 , 7 , 17. [CrossRef]
  9. Lahiri, S.; Rizzi, M.; Rossi, F.; Miggiano, R. Mycobacterium tuberculosis UvrB forms dimers in solution and interacts with UvrA in the absence of ligands. Proteins 2018 , 86 , 98–109. [CrossRef]
  10. Uddin, R.; Siraj, B.; Rashid, M.; Khan, A.; Ahsan Halim, S.; Al-Harrasi, A. Genome subtraction and comparison for the identification of novel drug targets against mycobacterium avium subsp. hominissuis. Pathogens 2020 , 9 , 368. [CrossRef]
  11. Bespyatykh, J.; Shitikov, E.; Bespiatykh, D.; Guliaev, A.; Klimina, K.; Veselovsky, V.; Arapidi, G.; Dogonadze, M.; Zhuravlev, V.; Ilina, E.; et al. Metabolic changes of mycobacterium tuberculosis during the anti-tuberculosis therapy. Pathogens 2020 , 9 , 131. [CrossRef]
  12. Maslov, D.A.; Shur, K.V.; Vatlin, A.A.; Danilenko, V.N. MmpS5-MmpL5 Transporters Provide Mycobacterium smegmatis Resistance to imidazo[1,2-b][1,2,4,5]tetrazines. Pathogens 2020 , 9 , 166. [CrossRef] [PubMed]
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© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).