Aim: The present study evaluated the effects of polydeoxyribonucleotide (PDRN) on tissue regeneration, paying special attention to the molecular mechanisms that underlie its tissue remodeling actions to better identify its effective therapeutic potential in wound healing. Materials & methods: Strategic searches were conducted through MEDLINE/PubMed, Google Scholar, Scopus, Web of Science and the Cochrane Central Register of Controlled Trials, from their earliest available dates to March 2020. The studies were included with the following eligibility criteria: studies evaluating tissue regeneration, and being an in vitro, in vivo and clinical study. Results: Out of more than 90 articles, 34 fulfilled the eligibility criteria. All data obtained proved the ability of PDRN in promoting a physiological tissue repair through salvage pathway and adenosine A2A receptor activation. Conclusion: Up to date PDRN has proved promising results in term of wound regeneration, healing time and absence of side effects.

Significance: Dysregulated inflammation is a critical factor in the development of a wide range of diseases. Controlling inflammatory responses can be challenging because available treatment options are often limited. This review discusses the ability of polydeoxyribonucleotides (PDRN) to modulate inflammation and the evidence that supports it. Recent Advances: PDRN is known in the clinical field for its regenerative properties. This action is partially related to the stimulation of the purinergic system through adenosine A2A receptors (A2ARs). Recently, the topical antiinflammatory effects of PDRN have aroused much interest, with a growing body of research supporting its use for the management of several inflammatory states. Critical Issues: Impaired tissue repair and several metabolic disorders are associated with chronic inflammation. Despite the growing clinical concern, an optimal and sustainable therapy for different inflammatory conditions has not yet been established, and current treatments are often limited by their short-term efficacies and side effects. Future Directions: The present review provides an updated summary of the ability of PDRN to control inflammation as observed in several in vitro studies, simplified models of the main biological mechanisms mediating its anti-inflammatory effect, and confirmed in vivo and clinical models. It analyzes the therapeutic potential of PDRN in terms of its mechanism of action through A2AR activation, its efficacy and its complications compared with those of current anti-inflammatory drugs.

Previous analysis has shown that the use of narrative devices in the biomedical literature has changed over time. The purpose of the present study was to measure the degree of narrativity in corpora of scientific abstracts obtained from Pubmed through the use of a proprietary software LIWC 2022, which, based on pre-set dictionaries, attributes scores for Staging, Plot Progression and Cognitive Tension to texts. Each text is automatically divided into a number of segments, so that the score change can be assessed throughout the different parts of a text, thus identifying its narrative arc. We systematically applied the scoring system to a corpus of 680,000 abstracts from manuscripts of any kind and genre published in the years 1989–2022 and indexed in MEDLINE, an independent corpus of 680,000 abstracts of Primary studies published in the same years, and finally a corpus of 680,000 abstracts of Review papers that appeared in the 1989–2022 interval. We were able to create plots of the pattern of how these three scores changed over time in each corpus and observed that the prototypical pattern observed in narrative texts, e.g., novels, is not seen in abstracts of the scientific literature, which, however, mostly possess a diverse but quite reproducible pattern. Overall, Reviews better conform to a higher degree of narrativity than Primary studies.

Polynucleotides (PN) have long been known as an effective supportive therapy for wound healing. The present study investigated whether a hydrogel formulation containing PN and hyaluronic acid (PN + HA) could promote wound healing in an in vitro model of gingival fibroblasts. PN promoted cell growth and viability as assessed by different assays, and PN + HA, though not significantly further increasing cell growth as compared to PN, supported the formation of dense multilayered cell nodules. PN promoted fibroblasts’ clonogenic efficiency and PN + HA further enhanced the formation of more numerous dense colonies. PN + HA appeared to significantly increase the expression of collagen 1a1 and 3a1, while not affecting proteoglycans deposition. Interestingly, when tested in a scratch assay, PN + HA achieved gap closure after 48 h, while cells in the comparison groups had not completely bridged the scratch even after 96 h. Taken together, these results demonstrate that PN + HA is a promising candidate for a supportive therapy to promote soft tissue healing in the oral cavity.

Everybody, regardless of their role, is aware that biomedical research is rapidly evolving, and the demand for reproducibility is increasing together with the amount of novel information. “Before reproducibility must come pre-producibility” “Checklists work to improve science”, just to quote some of the articles querying how to find a new bridge between ethics in science and the urgency for publishing. Looking for papers on anti-inflammatory compounds in periodontics, we came across a significant number of articles that could be considered a prototype of a consistent study format. The literature on the testing of active compounds on lipopolysaccharides- (LPS)-induced inflammation in gingival fibroblasts was searched to identify studies that followed a consistent format, to better understand their similarities and assess the appropriateness of their methods. Several studies were identified with a degree of similarity in their methods and formatting that was so high that it was possible to rule out that it was due to chance, and a format template common to these studies was outlined. Although this was most likely beyond the intentions of their authors, these studies may pose the basis for an in-vitro testing standard for anti-inflammatory compounds; however, the dangers of acritical uniformity are also apparent.