Junctional Epithelium Biology in Periodontal Health and Disease

The junctional epithelium represents a specialised mucosal barrier that anchors the gingiva to the tooth surface, forming the first line of defence against microbial invasion. Characterised by a rapid cellular turnover and minimal keratinisation, this epithelium is bound to mineralised enamel by a bespoke basal lamina enriched with unique constituents such as amelotin, odontogenic ameloblast-associated protein and secretory calcium-binding phosphoprotein proline-glutamine rich 1. Adhesive interactions mediated by integrins, notably αvβ6, sustain structural integrity under constant microbial challenge. In health, the junctional epithelium maintains periodontal homeostasis by regulating inflammatory signalling and facilitating rapid repair. Disruption of this seal through proteolytic degradation or dysregulated cell adhesion leads to epithelial detachment, bacterial ingress and a cascade of inflammatory mediators, driving the progression from gingivitis to periodontitis. Recent insights into the stem cell populations responsible for epithelial renewal have opened avenues for targeted regenerative therapies. Moreover, understanding the molecular dialogue between epithelia, matrix components and the oral microbiome is paving the way for novel diagnostic biomarkers and site-specific interventions to preserve alveolar bone and prevent tooth loss.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Junctional Epithelium Biology in Periodontal Health and Disease publication trend

The graph below shows the total number of articles in junctional epithelium biology in periodontal health and disease across all publications each year (not limited to Nature Index journals).

Technical terms

Junctional epithelium: The specialised epithelium attaching the gingiva to the tooth surface, forming a protective barrier against oral pathogens.

Specialised basal lamina: The unique extracellular matrix layer rich in laminins and specific proteins that secures the junctional epithelium to mineralised enamel.

Integrins: Transmembrane adhesion receptors, such as αvβ6, that link epithelial cells to the basal lamina and transduce mechanical and inflammatory signals.

Odontogenic ameloblast-associated protein (ODAM): A protein integral to basal lamina structure, which regulates epithelial attachment and cytoskeletal organisation via RhoA signalling.

RhoA signalling: A pathway involving the RhoA GTPase that controls actin cytoskeleton dynamics and cell adhesion in junctional epithelial cells.

Gingival crevicular fluid: The serum-like fluid in the gingival sulcus that reflects biochemical changes in periodontal tissues and may harbour diagnostic biomarkers.

References

1. Interactions of AMTN, ODAM and SCPPPQ1 proteins of a specialized basal lamina that attaches epithelial cells to tooth mineral. Scientific Reports (2017).
2. Odontogenic Ameloblast-associated Protein (ODAM) Mediates Junctional Epithelium Attachment to Teeth via Integrin-ODAM-Rho Guanine Nucleotide Exchange Factor 5 (ARHGEF5)-RhoA Signaling*. Journal of Biological Chemistry (2015).
3. Odontogenic ameloblast-associated protein (ODAM) in gingival crevicular fluid for site-specific diagnostic value of periodontitis: a pilot study. BMC Oral Health (2018).
4. Structure of junctional epithelium is maintained by cell populations supplied from multiple stem cells. Scientific Reports (2021).
5. Selective bacterial degradation of the extracellular matrix attaching the gingiva to the tooth. European Journal Of Oral Sciences (2019).