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Dong M, Ma X, Wang D, Ma X, Zhang J, Yu L, Yang Q, Hu D, Qiao D. Higher Virulence Renders K2 Klebsiella pneumoniae a Stable Share Among Those from Pyogenic Liver Abscess. Infect Drug Resist 2024; 17:283-291. [PMID: 38293315 PMCID: PMC10825582 DOI: 10.2147/idr.s442454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 01/18/2024] [Indexed: 02/01/2024] Open
Abstract
Objective To explore why serotype K2 accounts for a stable share in Klebsiella pneumoniae from pyogenic liver abscess (PLA). Methods Totally 15 K2 K. pneumoniae strains from PLA, 21 K2 from non-PLA, and 31 K1 from PLA were collected from China. Sequence typing, molecular serotyping, regular PCR, and Galleria mellonella lethality were performed. A total of 12 virulence genes were detected: peg-344, allS, p-rmpA, p-rmpA2, c-rmpA, fimH, mrkD, iucA, iroN, irp2, entB, and wzi. The differences between K2 K. pneumoniae strains from PLA and non-PLA were investigated along with K1 ones. Results Significant differences were found between K2 strains from PLA and non-PLA for the rates of virulence genes peg-344 and iucA. The latter group also showed more diverse sequence types than the former. Significant differences were only found for virulence genes allS and irp2 between K1 and K2 strains from PLA. Based on the equal virulence factors backgrounds other than serotypes, K2 strain is more virulent than K1 as G. mellonella lethality confirmed. Gene p-rmpA only brings equal virulence to p-rmpA plus p-rmpA2 in K2 strain. Conclusion Based on the same virulence factors backgrounds except serotypes, K2 K. pneumoniae is more virulent than K1 from PLA, which provides a survival advantage to maintain a stable share.
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Affiliation(s)
- Min Dong
- Department of Pulmonary Diseases (Department of Respiratory and Critical Care Medicine), Gansu Provincial Hospital of Traditional Chinese Medicine, Lanzhou, Gansu, People’s Republic of China
| | - Xiumin Ma
- State Key Laboratory of Pathogenesis, Prevention and Treatment of High Incidence Diseases in Central Asia, Clinical Laboratory Center, Tumor Hospital Affiliated to Xinjiang Medical University, Urumqi, Xinjiang, People’s Republic of China
| | - Donglian Wang
- Department of Laboratory Medicine, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, Zhejiang, People’s Republic of China
| | - Xiaobo Ma
- Department of Clinical Laboratory, the First Affiliated Hospital of Xiamen University (Xiamen Key Laboratory of Genetic Testing), Xiamen, People’s Republic of China
| | - Jin Zhang
- Department of Laboratory Medicine, Taizhou Municipal Hospital, Taizhou, Zhejiang, People’s Republic of China
| | - Lianhua Yu
- Department of Laboratory Medicine, Taizhou Municipal Hospital, Taizhou, Zhejiang, People’s Republic of China
| | - Qing Yang
- Department of Laboratory Medicine, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, People’s Republic of China
| | - Dakang Hu
- Department of Laboratory Medicine, Taizhou Municipal Hospital, Taizhou, Zhejiang, People’s Republic of China
- Department of Laboratory Medicine, Huashan Hospital, Fudan University, Shanghai, People’s Republic of China
| | - Dengyan Qiao
- Department of Laboratory Medicine, Gansu Provincial Hospital of Traditional Chinese Medicine, Lanzhou, Gansu, People’s Republic of China
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Hu D, Chen W, Wu J, Luo X, Yu L, Qu Y, Zhang X, Zhang J, Ma B. Coexistence of c-rmpA with p-rmpA and p-rmpA2 rather than excessive siderophores confers higher virulence in K1 Klebsiella pneumoniae. Pathology 2023; 55:1004-1012. [PMID: 37802741 DOI: 10.1016/j.pathol.2023.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 07/12/2023] [Accepted: 07/23/2023] [Indexed: 10/08/2023]
Abstract
Pyogenic liver abscess (PLA), which is particularly endemic in East Asia, is a relatively common and fatal infectious disease. Over the last 30-40 years, Klebsiella pneumoniae has replaced Escherichia coli as the dominant and overwhelming pathogen. To investigate the survival advantage of serotype K1 K. pneumoniae, we determined sequence types (STs), serotypes, and 11 virulence genes (allS, entB, irp2, iroN, iucA, fimH, mrkD, p-rmpA2, c-rmpA, p-rmpA, and peg-344). Virulence genes c-rmpA, p-rmpA, and p-rmpA2 in K. pneumoniae NTUH-K2044, which all confer hypercapsule and consequent hypervirulence, were deleted individually, and the consequent effects were evaluated. The lethality of various K1 K. pneumoniae strains was compared by using the Galleria mellonella model. In total, 31 K1 K. pneumoniae strains causing PLA and 30 causing non-PLA were identified. A significantly higher rate of c-rmpA was presented in PLA-derived K. pneumoniae strains than in non-PLA-derived strains. Similar ST23 (which dominates K1 strains) and string test-positive rates were observed in the two groups. Deletion of c-rmpA, p-rmpA, and p-rmpA2 individually did not confer significant effects on morphologies, such as positive string test, hypercapsule, and growth speed. Δc-rmpA presented weaker expressions of p-rmpA/p-rmpA2 than NTUH-K2044 and showed a higher expression of manC than Δp-rmpA and Δp-rmpA2. Three rmpAs conferred more virulence than one or two rmpAs, which presented an equally lethal effect in K1 K. pneumoniae. Klebsiella pneumoniae strains (H19 and H34) with the same genetic backgrounds except for siderophores showed equal virulence, but were less virulent than strain NTUH-K2044. Thus, the coexistence of c-rmpA with p-rmpA and p-rmpA2 enhances the lethality of K1 K. pneumoniae strains and the development of PLA. Excessive siderophores are not vital for the hypervirulence of K1 K. pneumoniae strains, although K1 strains usually harbour them on a molecular basis.
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Affiliation(s)
- Dakang Hu
- Department of Laboratory Medicine, Taizhou Municipal Hospital, Taizhou, Zhejiang, China
| | - Wenjie Chen
- Department of Infectious Diseases, Huashan Hospital, Fudan University, Shanghai, China
| | - Jinzuan Wu
- Department of Clinical Laboratory, Pingyang Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Xinhua Luo
- Department of Laboratory Medicine, Taizhou Municipal Hospital, Taizhou, Zhejiang, China
| | - Lianhua Yu
- Department of Laboratory Medicine, Taizhou Municipal Hospital, Taizhou, Zhejiang, China
| | - Ying Qu
- Department of Laboratory Medicine, Taizhou Municipal Hospital, Taizhou, Zhejiang, China
| | - Xijiang Zhang
- Department of Critical Care Medicine, Taizhou Municipal Hospital, Taizhou, Zhejiang, China
| | - Jin Zhang
- Department of Laboratory Medicine, Taizhou Municipal Hospital, Taizhou, Zhejiang, China.
| | - Bin Ma
- School of Medical, Molecular and Forensic Sciences, Murdoch University, Murdoch, WA, Australia.
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