Evidence map›Paper›PMID 9884329›Full record

ArticleThe Journal of clinical investigation1999

Tetracycline therapy targets intracellular bacteria in the filarial nematode Litomosoides sigmodontis and results in filarial infertility.

A Hoerauf, K Nissen-Pähle, C Schmetz, K Henkle-Dührsen, M L Blaxter, D W Büttner, M Y Gallin, K M Al-Qaoud, R Lucius, B Fleischer

Open access · bronzeAbstract read
In one paragraph

Article in The Journal of clinical investigation, 1999. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 135 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
135citing papers in PubMed, 1 pooled it
35.0field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

135 citing papers in PubMed, 1 synthesis or guideline pooled it, 341 citations in OpenAlex.

  1. Therapeutic efficacy and macrofilaricidal activity of doxycycline for the treatment of river blindness.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2015
    Pooled it
  2. Trial
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  5. Article
  6. The history of Wolbachia and heartworm.Parasites & vectors · 2026
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  9. Fexinidazole and Corallopyronin A targetbioRxiv : the preprint server for biology · 2025
    Article
  10. Article
  11. The Diversity ofBiology · 2024
    Article
  12. The cellular lives of Wolbachia.Nature reviews. Microbiology · 2023
    Review
  13. Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Whole genome analysis of two sympatric humanFrontiers in cellular and infection microbiology · 2023
    Article
  19. Article
  20. Aspartyl Protease Inhibitors as Anti-Filarial Drugs.Pathogens (Basel, Switzerland) · 2022
    Article

75 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors at 3 institutions in 2 countries.

A HoeraufBernhard Nocht Institute for Tropical Medicine, 20359 Hamburg, Germany. hoerauf@bni.uni-hamburg.de
K Nissen-Pähle
C Schmetz
K Henkle-Dührsen
M L Blaxter
D W Büttner
M Y Gallin
K M Al-Qaoud
R Lucius
B Fleischer
Bernhard Nocht Institute for Tropical Medicine · DEHumboldt-Universität zu Berlin · DEUniversity of Edinburgh · GB

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Intracellular bacteria have been described in several species of filarial nematodes, but their relationships with, and effects on, their nematode hosts have not previously been elucidated. In this study, intracellular bacteria were observed in tissues of the rodent parasite Litomosoides sigmodontis by transmission electron microscopy and by immunohistochemistry using antiendobacterial heat shock protein-60 antisera. Molecular phylogenetic analysis of the bacterial 16S ribosomal RNA gene, isolated by PCR, showed a close relationship to the rickettsial Wolbachia endobacteria of arthropods and to other filarial intracellular bacteria. The impact of tetracycline therapy of infected rodents on L. sigmodontis development was analyzed in order to understand the role(s) these bacteria might play in filarial biology. Tetracycline therapy, when initiated with L. sigmodontis infection, eliminated the bacteria and resulted in filarial growth retardation and infertility. If initiated after microfilarial development, treatment reduced filarial fertility. Treatment with antibiotics not affecting rickettsial bacteria did not inhibit filarial development. Acanthocheilonema viteae filariae were shown to lack intracellular bacteria and to be insensitive to tetracycline. These results suggest a mutualistic interaction between the intracellular bacteria and the filarial nematode. Investigation of such a mutualism in endobacteria-containing human filariae is warranted for a potential chemotherapeutic exploitation.

Indexed as

AnimalsBacterial ProteinsDipetalonemaFilariasisFilarioideaImmunohistochemistryInfertilityMiceMice, Inbred BALB CMicroscopy, ElectronPhylogenyRatsRickettsiaRNA, Ribosomal, 16STetracyclineBacterial ProteinsRNA, Ribosomal, 16STetracycline

Identifiers

PMID9884329
PMCPMC407866
OpenAlexW2157404496

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.