Recent Trends in the Pathophysiology of Leptospirosis

A special issue of Tropical Medicine and Infectious Disease (ISSN 2414-6366).

Deadline for manuscript submissions: closed (23 April 2023) | Viewed by 1637

Special Issue Editors


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Guest Editor
1. Medical Microbiology Laboratory, Department of Microbiology, Centre for Excellence in Life Sciences, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India
2. Department of Neural Sciences, Lewis Katz School of Medicine, Temple University, Philadelphia, PA 19140, USA
Interests: infectious diseases; leptospirosis; molecular pathogenesis

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Guest Editor
Heart and Vascular Institute, Department of Medicine, Department of Cellular and Molecular Physiology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
Interests: infection and inflammation; mitochondrial biology; Ca2+ and Mg signaling; ion channels

Special Issue Information

Dear Colleagues,

Leptospirosis is an acute septicemic illness that affects humans and animals. It is caused by bacteria of the genus Leptospira. Humans contract leptospiral infection through direct contact with the blood, tissue organs, and urine of infected animals or through indirect contact by exposure to contaminated water, as leptospires are capable of penetrating through the injured mucosa or skin that confronts contaminated water bodies.

Without treatment, leptospirosis can lead to multiorgan failure and even death. The clinical manifestations of leptospirosis range from mild symptoms to severe forms of the disease with jaundice, acute kidney injury (AKI), cardiovascular manifestations, and pulmonary hemorrhages. The early phase of manifestation lasts 3–7 days with fever, headaches, myalgia, nausea, vomiting, malaise, and conjunctival hyperemia. This phase is known as a leptospiral blood bath because it widely circulates in the blood. Further, the severe form of the disease progresses to the second chronic phase, which lasts up to 30 days and initiates more complicated systemic impairments. AKI is one of the reported incidences of a severe form of leptospirosis, the kidney being the principal target organ of Leptospira. Interstitial nephritis is the major pathological alteration that occurs in patients with leptospirosis. Then, pulmonary hemorrhage top to acute respiratory distress syndrome (ARDS) occurs, and this establishes the most severe manifestation of lung injury. AKI and ARDS are consistently linked due to their association during leptospirosis, resulting in high fatality rates. Consequently, early identification of hemorrhage syndrome during leptospiral infection is crucial for faster management and a reduction in casualty rates. Apart from these, cardiac arrhythmias can also occur due to atrial fibrillation and atrioventricular blockage.   

Thus, effective management strategies need a comprehensive understanding of the pathophysiology of leptospirosis. The disposal of the complete genome sequences of Leptospira interrogans applies to understanding the front-line mechanisms of the pathophysiology of leptospirosis. Injuries to the cell membrane are the reason for severe consequences to the host, such as loss of vascular integrity, ischemia, and necrosis, leading to significant organ dysfunctions. Then, understanding the molecular mechanisms involved in the pathogenesis and pathology of leptospirosis at a cellular level is of utmost importance for prognostic and therapeutic applications. This Special Issue invites research papers focused on understanding the pathophysiology of leptospirosis with native to contemporary developments to benefit case management in an effective way to reduce mortality.

Prof. Dr. Kalimuthusamy Natarajaseenivasan
Dr. Santhanam Shanmughapriya
Guest Editors

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Keywords

  • Leptospira interrogans
  • leptospirosis
  • pathogenesis
  • pathology
  • immune response
  • biomarkers

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Published Papers (1 paper)

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Research

15 pages, 2778 KiB  
Article
LIC12254 Is a Leptospiral Protein That Interacts with Integrins via the RGD Motif
by Maria F. Cavenague, Aline F. Teixeira, Luis G. V. Fernandes and Ana L. T. O. Nascimento
Trop. Med. Infect. Dis. 2023, 8(5), 249; https://doi.org/10.3390/tropicalmed8050249 - 26 Apr 2023
Cited by 2 | Viewed by 1294
Abstract
Pathogenic leptospires can bind to receptors on mammalian cells such as cadherins and integrins. Leptospira effectively adheres to cells, overcomes host barriers and spreads into the bloodstream, reaching internal target organs such as the lungs, liver and kidneys. Several microorganisms produce proteins that [...] Read more.
Pathogenic leptospires can bind to receptors on mammalian cells such as cadherins and integrins. Leptospira effectively adheres to cells, overcomes host barriers and spreads into the bloodstream, reaching internal target organs such as the lungs, liver and kidneys. Several microorganisms produce proteins that act as ligands of integrins through the RGD motif. Here, we characterized a leptospiral RGD-containing protein encoded by the gene lic12254. In silico analysis of pathogenic, intermediate and saprophytic species showed that LIC12254 is highly conserved among pathogenic species, and is unique in presenting the RGD motif. The LIC12254-coding sequence is greatly expressed in the virulent Leptospira interrogans L1-130 strain compared with the culture-attenuated L. interrogans M20 strain. We also showed that the recombinant protein rLIC12254 binds to αVβ8 and α8 human integrins most likely via the RGD motif. These interactions are dose-dependent and saturable, a typical property of receptor–ligand interactions. The binding of the recombinant protein lacking this motif—rLIC12254 ΔRAA—to αVβ8 was almost totally abolished, while that with the α8 human integrin was decreased by 65%. Taken together, these results suggest that this putative outer membrane protein interacts with integrins via the RGD domain and may play a key role in leptospirosis pathogenesis. Full article
(This article belongs to the Special Issue Recent Trends in the Pathophysiology of Leptospirosis)
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