Effect of platelet-rich fibrin on cell proliferation, migration, differentiation, inflammation, and osteoclastogenesis: a systematic review of in vitro studies



To systematically assess the effects of platelet-rich fibrin (PRF) on in vitro cellular behavior.


A systematic electronic search using MEDLINE database was performed. In vitro studies using PRF were considered and articles published up to June 31, 2018 were screened. Eligible studies were selected based on the use of human PRF.


In total, 1746 titles were identified with the search terms, from these 37 met the inclusion criteria and were chosen for data extraction. In addition, 16 new studies, mainly published in 2019, were also included in the analysis resulting in 53 studies. No meta-analysis could be performed due to the heterogeneity of study designs. Included studies show that PRF enhances proliferation, migration, adhesion, and osteogenic differentiation on a variety of cell types along with cell signaling activation. Furthermore, PRF reduces inflammation, suppresses osteoclastogenesis, and increases the expression of various growth factors in mesenchymal cells.

Summary and conclusions

Despite some notable differences of the studies, the overall findings suggest a positive effect of PRF on cell proliferation, migration, adhesion, differentiation, and inflammation pointing towards a therapeutic potential in regenerative dentistry.

Clinical relevance

PRF serves as a reservoir of bioactive molecules to support wound healing and bone regeneration. Although the cellular mechanisms by which PRF supports the clinical outcomes remain unclear, in vitro research provides possible explanations. This systematic review aims to provide an update of the existing research on how PRF affects basic physiological processes in vitro. The overall findings suggest that PRF induces cell proliferation, migration, adhesion, and differentiation along with possessing anti-inflammatory properties further supporting its therapeutic potential in wound healing and bone regeneration.


Platelet-rich fibrin (PRF) is becoming an attractive and widely-used approach in regenerative dentistry. PRF is a platelet-rich plasma that undergoes natural coagulation after being separated from the red thrombus by centrifugation [1]. The evolution of PRF started with the introduction of L-PRF based on a high-speed protocol (~ 700 g for 12 min) [1]. Later on, A-PRF (~ 200 g for 8 min) and injectable PRF (~ 60 g for 3 min) with lower g-forces and centrifugation times were introduced with the overall aim to increase the number of platelets and leucocytes [2]. For this aim, the use of centrifuges with swing-out rotors has also been recommended [2]. Obviously PRF is an umbrella term that comprises various preparations and protocols, therefore a standardization of relative centrifugal forces (RCF) [3] has been suggested. Nonetheless, most of the clinical data derive from the classical L-PRF protocol [1].

Fig. 1

PRISMA Flow Diagram

Recent systematic reviews dealt with the clinical application of PRF in periodontal defects, periodontal plastic surgery [4], sinus floor elevation, alveolar ridge preservation, or implant therapy [5]. For example, PRF preserves the alveolar ridge after tooth extraction [6], enhances osseointegration in the early phase [7, 8] and can increase the width of keratinized mucosa around implants [9]. Even though emerging evidence indicates that local application of PRF can support the outcomes of the above-mentioned clinical indications, the underlying cellular mechanisms remain unclear. Based on the assumption that PRF supports the conserved cellular mechanisms of wound healing and bone regeneration, it can, therefore, be assumed that PRF drives the cellular responses also under in vitro conditions.

In vitro bioassays can confirm the impact of PRF on standard cellular responses such as proliferation, migration, and differentiation, all of which may predict a possible clinical efficacy. However, care should be taken when interpreting the observations, as the early hematoma that usually forms in defect sites is not represented in the in vitro assays [10]. Readers of this review should also be aware that some of the observations reported for PRF have already been shown for plasma-free leucocyte-depleted activated platelets [11,12,13] based on the compelling in vitro evidence gained from platelet-rich plasma [14, 15].

The cellular responses to PRF were summarized in a systematic review integrating seven in vitro studies [16]. However, given the increasing number of in vitro studies, not limited to dentistry, a revised view on today's in vitro research on PRF seems justified. This systematic review aims to provide an update of the existing research on how PRF affects basic physiological processes in vitro.

Material and methods

Protocol development and eligibility criteria

A protocol including all aspects of a systematic review methodology was developed prior to starting the review. This included definition of the focused question, a defined search strategy, study inclusion criteria, determination of outcome measures, screening methods, data extraction, and analysis and data synthesis.

Defining the focused question

The following focused question was defined: “what is the effect of PRF on cell behavior in in vitro studies?”

Search strategy

An electronic search using MEDLINE database was performed. Articles published up to June 30, 2018 were considered. No language or time restrictions were applied in the search. However, only studies written in English were included for selection.

Search terms

The electronic search strategy included terms related to the intervention and used the following combination of key words and MeSH terms: leukocyte platelet-rich fibrin” OR “pure platelet-rich fibrin” OR “LPRF” OR “L-PRF” OR “advanced platelet-rich fibrin” OR “APRF” OR “A-PRF” OR “L-PRF Gel” OR “leukocytes“ OR “platelets” OR “blood platelets” OR “platelet” AND “in vitro techniques” OR “cytokines” OR “intercellular signaling peptides and proteins” OR “intercellular” OR intercellular signaling peptides and proteins” OR “growth factors” OR “transforming growth factor beta” OR “bone marrow” OR “stem cells” OR “macrophages” OR “osteoclasts” OR “inflammation“ OR “Cell Physiological Phenomena” OR “Cell Plasticity” OR “cell differentiation” OR “osseointegration” OR “Dental Implants.”

Criteria for study selection and inclusion

Only in vitro studies evaluating the effect of PRF were considered.

Exclusion criteria

In vitro studies using other kinds of platelet concentrates such as PRGF or PRP or any other platelet concentrate that required the addition of anticoagulant. Pre-clinical and in vitro studies that did not use human blood.

Screening and selection of studies

Publication records and titles identified by the electronic search were independently screened by two reviewers (JN and ZK) based on the inclusion criteria. Discrepancies were solved by discussion among authors (RG and FJS). Cohen’s Kappa-coefficient was used as a measure of agreement between the readers. Thereafter, full texts of the selected abstracts were obtained. The two reviewers independently performed the screening process, i.e., from the MeSH term search up to the full-text examination. Then, articles that met the inclusion criteria were processed for data extraction.

Data extraction and analysis

The inclusion criteria were applied for data extraction. The studies were classified according to study design and type of methods applied. Then, outcomes were compiled in tables. All extracted data were double-checked, and any questions that came up during the screening and the data extraction were discussed within the authors to aim for consensus.


Selection of studies

In the original search 1746 potential references were identified in Medline which 59 were eligible after title and abstract screening (inter-reviewer agreement κ = 0.952). Of the 59 full-text articles, 22 did not meet the inclusion criteria and were excluded (Fig. 1) obtaining 37 studies for data extraction (Table 1). During the submission-process of the present review, 16 new studies meeting the inclusion criteria were published and therefore included for data extraction (Table 2).

Table 1 Included studies
Table 2 Included studies


PRF increased proliferation of mesenchymal cells, for example from bone of different origin [19, 24,24,26, 28, 45, 50, 66, ], bone marrow [32, 39], periosteum [27], adipose tissue [37, 47, 68], and skin [65, 48]. Also, fibroblasts from gingiva [38, 44], periodontal ligament [18, 52, 59], papilla [30], and dental pulp responded to PRF with increased proliferation [29, 31, 43, 54]. These observations were reproduced in embryonic kidney fibroblasts and in various cell lines such as HEK293, MG-63 osteosarcoma cells, human oral keratinocytes, SIRC, and 3T3 cells [18]. Mesenchymal cells, endothelial cells [23, 42, 55, 63], epithelial cells [22], and macrophages [69] also responded to PRF with increasing proliferation. In contrast, PRF failed to induce proliferation of L929 fibroblasts [53] and human mesenchymal stem cells on collagen scaffolds [17]. In general, PRF maintained cell viability [33, 63,57,58,66, ] without inducing apoptosis [40]. Overall, there is a general consensus that PRF has a potent mitogenic activity.


There are various methods to identify the impact of PRF on cell migration including the scratch assay [70] and the traditional Boyden chamber approach [71]. Regardless of the method used, PRF increased the migration of neural stem cells [54] along with cells of the mesenchymal lineage isolated from bone [45, 64], bone marrow [72], gingiva [38, 64, 36], apical papilla [30], and skin [65, 48]. Similarly, endothelial cells responded to PRF with an increased migration [63, 72, 41]. In contrast, an inhibitory effect of PRF on cell migration was also observed on bone marrow cells but likely due to the aggregation and proliferation effect of PRF that precedes migration [32]. Likewise, in one recent study, PRF failed to induce migration on L929 fibroblasts [53]. However, the general view is that PRF supports cell motility.

Alkaline phosphatase and alizarin red staining

The main early marker of osteogenic differentiation is alkaline phosphatase [73]. Various studies showed that PRF increases the expression or the activity of alkaline phosphatase in cells of the mesenchymal lineage isolated from bone [45, ], bone marrow [25], apical papilla [30], dental pulp [31, 34, 43, 49], periodontal ligament [59, 74], osteosarcoma cell lines [21], and other tissues [24]. Moreover, PRF increased mineralized nodules in cells from dental pulp [34, 43, 49], calvaria bone [28], bone marrow [32], and periodontal ligament [59]. Conversely, one study showed an inhibitory effect of PRF on alkaline phosphatase activity [52]. In two other reports, PRF failed to change alkaline phosphatase activity and did not change alkaline phosphatase expression in rat calvaria osteoblasts [28] and bone marrow cells [40], respectively. Taken together, all but three studies reported an increase of alkaline phosphatase in response to PRF exposure.

Growth factors and extracellular matrix

PRF caused a moderate expression of various growth factors in mesenchymal and endothelial cells such as TGFβ [38, 46, 52, 56, 65, 36], PDGF [23, 38, 40, 46, 52, 56, 65, 36], and VEGF [23, 37, 58]. Dental pulp cells treated with PRF increased expression of dentin sialoprotein and dentin matrix protein 1 [29, 34, 49]. With respect to changes in the expression of extracellular matrix protein, PRF increased collagen type 1 in mesenchymal cells of the bone [45], skin [65], and gingiva [38, 73]. Likewise, PRF increased the expression of osteopontin, MMP2, and MMP9 in human bone marrow cells [40]. Conversely, PRF reduced the expression of bone sialoprotein and osteocalcin along with a transient downregulation of collagen type 1 in periodontal ligament cells [52]. Similarly, a downregulation of bone sialoprotein, dentin matrix protein 1, and dentin sialoprotein in cells from the papilla was reported [30]. It should be noted, however, that this downregulation disappeared after 14 days of stimulation [30]. In general, the reported increase of gene expression by PRF is moderate.

Cell adhesion

Cell adhesion proteins were enhanced by PRF, for example, ICAM-1 and E-selectin in cocultures of osteogenic and endothelial cells [23] and ICAM-1 in pulp cells [34]. Furthermore, PRF supported adhesion of mesenchymal cells [17], HUVEC [41], U2OS [50], and HBASC [51] on different scaffolds. These positive results nonetheless were not replicated on titanium surfaces [46] and culture plates [45]. Together, these observations suggest that in the majority of experiments, PRF could support cell adhesion.

Cell signaling, inflammation, and osteoclastogenesis

PRF enhanced the phosphorylation of Akt, heat shock protein 47 and lysis oxidase in osteosarcoma cells [50], and VEGFR2 in endothelial cells [35]. PRF enhanced phosphorylation of ERK in osteosarcoma cells [19], and periodontal fibroblasts [74] along with an increase in OPG expression in both cell types. This PRF-induced OPG expression was also reported on dental pulp cells [31]. Moreover, PRF reduced LPS-induced cytokine production in pulp cells and enhanced the up-regulation of odontoblastic differentiation markers DSP and DMP-1 in these cells [34]. Similarly, PRF suppressed the LPS- and saliva-induced pro-inflammatory cytokines on primary and RAW264.7 macrophages and attenuated the translocation of NF-κB into the nucleus [69]. This anti-inflammatory effect was replicated in gingival fibroblasts [61]. In addition, in dental pulp cells, PRF increased DSP and DMP1 expression along with an activation of BMP 2/4 signaling and phosphorylation of SMAD1/5/8 cascade [49]. Osteoclasts originate from hematopoietic progenitors and in the presence of the survival factor (M-CSF) and RANKL differentiate into osteoclasts staining positive for TRAP. PRF suppressed the expression of osteoclast marker genes TRAP, DCSTAMP, NFATc, and OSCAR. Altogether, these results suggest that PRF can affect central signaling pathways, possesses an anti-inflammatory effect, and is capable of inhibiting osteoclastogenesis [57].


This systematic review encompassed in vitro studies using PRF and can be viewed as an extension of the previous work of Miron et al. [16]. Our aim was to gather the current in vitro evidence on cellular responses to PRF. Despite the steadily increasing number of in vitro studies, much of the available evidence has focused on confirming similar findings. The majority of studies assessed the impact of PRF on proliferation, adhesion, migration, and differentiation mainly on mesenchymal cells and to some extent, endothelial and epithelial cells. Overall, PRF triggered an increase in the above-mentioned parameters and revealed anti-inflammatory properties. PRF also showed a moderate but consistent capacity to modulate the expression of target genes activating different signaling pathways.

A meta-analysis could not be performed as the included studies revealed heterogeneity in terms of study design, evaluation methods, outcome measures, and observation periods. Besides the original L-PRF protocol, other PRF protocols were used, however, most studies did not provide enough details. These details are of importance as with different protocols [3], i.e., centrifugation time and g-force, characteristics such as the release of growth factors or the content of living cells are substantially changed [75]. For instance, by reducing the g-force, there is an improvement in growth release and cell content. This finding is considered one of the major innovations in PRF leading to the development of new protocols including advanced platelet-rich fibrin (A-PRF+), injectable PRF (i-PRF), and liquid PRF (fluid-PRF). In addition, there are other factors that were not considered in the different preparation protocols such as the centrifugation tubes which have a strong impact on the clot size [76]. Indeed, the silica used to coat plastic tubes might contaminate PRF and thereby provoking inflammation [77]. Likewise, differences in g-forces, blood volume, hematocrit levels, centrifugation time, and handling of PRF membranes impede an accurate comparison between the protocols. Furthermore, PRF lysates, PRF conditioned medium, and PRF exudates should also be distinguished from traditional protocols. Although these issues are at the heart of scientific discussion [78, 79], the main in vitro findings are rather consistent.

Successful tissue regeneration and osseointegration rely on the response of the surrounding cells. These biological processes inevitably require proliferation, migration, and differentiation of cells at the treatment site.

PRF consistently increased cell proliferation irrespective of the cell type and PRF preparation. One interesting setting was the increased cell proliferation on collagen matrices [72] and titanium surfaces [46] upon PRF coating. It is worth noting that two studies found a conspicuously reduced proliferation in gingival fibroblast [44] and dental pulp stem cells [43]. It is difficult, however, to determine why PRF led to a decline in cell proliferation. PRF membranes covering cells might decrease oxygenation [44]. Nonetheless, PRF preparation without providing enough details complicates the interpretation of the data [43]. Despite these shortcomings, the majority of the in vitro studies suggest a mitogenic activity of PRF for various cell types that might be attributed to the strong mitogen PDGF released by activated platelets [13, 80].

Cell migration was positively induced in all but two of the selected studies. This chemotactic effect is likely due to the presence of growth factors contained in platelets such as PDGF [12]. This growth factor, for example, pushes proliferation of osteogenic cells in vitro [81]. In addition, endothelial cells followed a similar pattern of displaying an increase in migration upon exposure to PRF [40]. Although the activation of platelets might account for these observations [11], the precise mechanism remains to be elucidated. In support of the mitogenic and chemotactic activity, PRF enhanced the phosphorylation of Akt [50], and ERK [19, 74] similar to what is observed in isolated platelets [12]. Conversely, inhibition of migration by PRF has been reported in alveolar bone marrow cells [32]. This effect might be explained by the aggregation and proliferation effect of PRF that precedes migration and also by methodological differences, which precludes an interpretation and a comparison with the other studies [3]. Despite these inconsistencies, PRF is able to induce cell migration, likely due to the presence of growth factors such as PDGF with chemotactic activity.

Cell differentiation is commonly assessed by means of measuring alkaline phosphatase and alizarin red staining. Various studies showed that PRF increases the expression or the activity of alkaline phosphatase in cells of the mesenchymal lineage [24, 25, 29,29,31, 34, 43, 45, 49, 65, 59, 74]. Some data, nonetheless, are conflicting since PRF can also reduce alkaline phosphatase activity [52] consistent with the effects of supernatants of isolated platelets [12]. This reduction may be attributed to TGF-β [82] and PDGF [12]. On the other hand, the increased mineralized nodules elicited by PRF in cells from dental pulp [34, 43, 49], calvaria bone [28], bone marrow [32], and periodontal ligament [59] appear to be a consequence of the enhanced proliferation, alkaline phosphatase activity, and production of collagen matrix. These in vitro findings, however, have to be interpreted with caution as proliferation and differentiation do not occur simultaneously [73].

With respect to growth factors such as TGFβ, PDGF, and VEGF, PRF moderately increased their expression. Regarding extracellular matrix proteins, PRF moderately increased the expression of collagen type 1, which is a known TGFβ target gene [83, 84] in mesenchymal cells of various origins. In line with collagen type 1 synthesis, PRF activates the expression of HSP47 and lysine oxidase [50]. Cell adhesion proteins were enhanced by PRF [23], however, they are not necessarily responsible for the increased cell adhesion on different scaffolds [51]. Together, these observations suggest that PRF induces moderate changes in gene expression. In contrast, recent data at our lab indicate a robust activation of TGFβ target genes IL11, PRG4, and NOX4 by PRF lysates (Di Summa et al. unpublished observation). TGF-β couples osteogenesis with angiogenesis by providing a pro-osteogenic microenvironment in vivo [62]. As TGF-β induces pro-osteogenic factors and TGF-β type 1 receptor inhibitor rescues uncoupled bone remodeling in vivo [62], PRF-derived TGF-β may support bone regeneration.

This systematic review revealed an anti-inflammatory effect of PRF. Moreover, during the submission process of the present review, new studies were published highlighting these anti-inflammatory effects of PRF. For example, PRF reduced the LPS-induced proinflammatory cytokine release in gingival fibroblasts [61]. In addition, we have recently shown that PRF reduces the expression of the M1 marker genes interleukin 1β (IL1β) and interleukin 6 (IL6) in bone marrow macrophages [69]. This anti-inflammatory effect might be explained by the high amounts of TGFβ in PRF [73] capable of modulating the M1 and M2 polarization along with the generation of pro-resolving lipid mediators [69]. Additionally, PRF induces the expression of the M2 markers arginase-1 and chitinase-like 3 (Chil3 or YM1) thereby assisting a M1-to-M2 transition [69]. Since dental implants activate the immune system during the early stages of osseointegration [85], the addition of PRF may support a M2 polarization reducing the time lag for osseointegration and bone regeneration. Notably, PRF can also decrease the formation of osteoclast-like cell in a murine bone marrow culture [57]. Similar findings were also reported in peripheral blood mononuclear cells derived CD14+ cells [86]. These observations are of particular interest since the favorable effects of PRF in alveolar ridge preservation [6] might be partly explained by an inhibition of osteoclastogenesis. Thus, accumulating evidence suggest that PRF possesses an anti-inflammatory activity and is capable of suppressing osteoclastogenesis.

PRF is a potent inducer of the in vitro angiogenic process indicated by endothelial proliferation, migration, and tube formation. PRF supports microvessel-like structures [23, 56] and induces blood vessel formation in the chorioallantoic membrane assay [63]. Apart from in vitro angiogenesis, a recent report described an antimicrobial effect of PRF. In that study, both PRF membranes and PRF exudates had an antimicrobial effect against P. gingivalis, a key periodontal pathogen [87]. Those findings support the rationale of using PRF as an adjunctive therapy for peri-implantitis [88]. These observations are also in line with previous data on purified activated platelet showing an angiogenic [11] and antimicrobial effect [89]. Overall, these findings imply that PRF possesses angiogenic and antimicrobial properties.

We recognize that the present report has a number of limitations. PRF is widely used in regenerative dentistry, however, in vitro models represent only a narrow aspect of wound healing and bone regeneration neglecting the holistic nature of an in vivo model. Furthermore, and considering that wound healing and bone regeneration involve granulocytes, lymphocytes and other cell types, today’s PRF research only covers a restricted spectrum of cells. It should also be noted that the same stimuli may play different roles depending on the differentiation stage of the target cell. For example, our group demonstrated that PRF membranes inhibit the formation of osteoclasts in bone marrow cultures [57]. This inhibition, however, did not occur when osteoclastogenesis had already started [57].

Future studies should, for example, include research on the immigration and activation of granulocytes and how PRF might control the resolution of inflammation. Moreover, and considering the importance of centrifugation tubes and the possible impact of silica coating, more studies investigating this issue are needed for the optimization of PRF. Finally, the overall question of whether the in vitro PRF research reflects the clinical reality serving as a surrogate parameter to adapt the current PRF protocols remains to be clarified.


Despite some notable differences of the included studies, the overall findings suggest a benefit of PRF on cell proliferation, migration, adhesion, differentiation, and inflammation pointing towards a therapeutic potential in wound healing and regeneration.


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Open access funding provided by Austrian Science Fund (FWF). This study was funded by a grant (17-125) from the Osteology Foundation, Switzerland. This research was further supported by a grant from Austrian Science Fund (FWF) (4072-B28). Franz Josef Strauss is supported by the Osteology Foundation and the Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), Chile. Jila Nasirzade and Zahra Kargarpour received support from the Osteology Foundation (17-125), Switzerland. Alexandra Stähli received grants from the Swiss Dental Association (288-15), the Swiss Society of Periodontology (SSP), the Foundation for the Promotion of Oral Health and Research as well as the Osteology Foundation.

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F.J.S. and R.G. contributed to conception and design; contributed to the literature research, analysis, and interpretation; drafted manuscript; critically revised manuscript; gave final approval; agreed to be accountable for all aspects of work. J.N. and Z.K. literature research, analysis, and interpretation; critically revised manuscript; gave final approval; agreed to be accountable for all aspects of work. A.S. analysis, and interpretation; critically revised manuscript; gave final approval; agreed to be accountable for all aspects of work.

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Correspondence to Reinhard Gruber.

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Strauss, FJ., Nasirzade, J., Kargarpoor, Z. et al. Effect of platelet-rich fibrin on cell proliferation, migration, differentiation, inflammation, and osteoclastogenesis: a systematic review of in vitro studies. Clin Oral Invest 24, 569–584 (2020). https://doi.org/10.1007/s00784-019-03156-9

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  • Platelet-rich fibrin
  • In vitro
  • Growth factor
  • Cell proliferation
  • Cell migration
  • Cell differentiation
  • Anti-inflammatory agents
  • Osteoclastogenesis