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Lipopolysaccharide in the Health and Disease

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Biochemistry".

Deadline for manuscript submissions: 20 November 2025 | Viewed by 933

Special Issue Editors


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Guest Editor
Control of Innate Immunity Collaborative Research Association, FROM KAGAWA 3F, Bio laboratory, 2217-16, Hyashi-cho Takamatsu-shi, Kagawa 761-0301, Japan
Interests: LPS; function of tissue macrophages; mode of action of oral administration of LPS; cognitive dysfunction; reverse aging
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Guest Editor
Control of Innate Immunity Collaborative Research Association, FROM KAGAWA 3F, Bio laboratory, 2217-16, Hyashi-cho Takamatsu-shi, Kagawa 761-0301, Japan
Interests: health maintenance by innate immunity; removal of senescent cells by macrophages; food-derived LPS; LPS effects on the host in intestinal bacteria and indigenous skin bacteria

Special Issue Information

Dear Colleagues,

LPS has potent immune-activating effects. Therefore, LPS has been widely used in research as a substance that easily induces inflammation, but the physiological role that LPS originally plays has not received much attention. However, LPS is ubiquitous in the environment and in the digestive tract. Therefore, the mucous membranes and skin of living individuals are permanently exposed to LPS. In other words, LPS is not toxic when administered to mucous membranes or skin. In fact, the oral administration of LPS has been shown to improve lifestyle-related diseases and lipid disorders, reduce the side-effects of anticancer drugs, improve cognitive functions, alleviate allergic symptoms, and prevent viral infections, without inducing inflammation, completely different from cases where LPS is administered intravascularly.

We hope to receive submissions about new discoveries related to the usefulness of LPS. On the other hand, papers that view LPS as merely a disease-aggravating factor or that focus solely on its inflammation-inducing effects are discouraged.

Dr. Gen-Ichiro Soma
Dr. Hiroyuki Inagawa
Guest Editors

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Keywords

  • usefulness of LPS
  • oral and/or dermal administration of LPS
  • lifestyle disease
  • cognitive dysfunction
  • allergy
  • autoimmune disorder
  • wound healing
  • cancer

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Published Papers (1 paper)

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13 pages, 1228 KiB  
Brief Report
Lipopolysaccharide-Activated Macrophages Suppress Cellular Senescence and Promote Rejuvenation in Human Dermal Fibroblasts
by Hiroyuki Inagawa, Chie Kohchi, Miyuki Uehiro and Gen-Ichiro Soma
Int. J. Mol. Sci. 2025, 26(15), 7061; https://doi.org/10.3390/ijms26157061 - 22 Jul 2025
Viewed by 274
Abstract
Tissue-resident macrophages are essential for skin homeostasis. This study investigated whether lipopolysaccharide (LPS)-activated macrophages affect senescence and rejuvenation in human dermal fibroblasts. Human monocytic THP-1 cells were stimulated with Pantoea agglomerans–derived LPS (1–1000 ng/mL), and culture supernatants were collected. These were applied [...] Read more.
Tissue-resident macrophages are essential for skin homeostasis. This study investigated whether lipopolysaccharide (LPS)-activated macrophages affect senescence and rejuvenation in human dermal fibroblasts. Human monocytic THP-1 cells were stimulated with Pantoea agglomerans–derived LPS (1–1000 ng/mL), and culture supernatants were collected. These were applied to two NB1RGB fibroblast populations: young, actively dividing cells (Young cells) and senescent cells with high population doubling levels and reduced proliferation (Old cells). Senescence markers P16, P21, and Ki-67 were analyzed at gene and protein levels. Conditioned medium from Old cells induced senescence in Young cells, increasing P16 and P21 expression levels. This effect was suppressed by cotreatment with LPS-activated THP-1 supernatant. Old cells treated with the LPS-activated supernatant exhibited decreased P16 and P21 levels as well as increased Ki-67 expression, indicating partial rejuvenation. These effects were not observed following treatment with unstimulated THP-1 supernatants or LPS alone. Overall, these findings suggest that secretory factors from LPS-activated macrophages can suppress cellular senescence and promote human dermal fibroblast rejuvenation, highlighting the potential role of macrophage activation in regulating cellular aging and offering a promising strategy for skin aging intervention. Full article
(This article belongs to the Special Issue Lipopolysaccharide in the Health and Disease)
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