جستجوی مقالات مرتبط با کلیدواژه "پلاسمای غنی از پلاکت" در نشریات گروه "پزشکی"

Isolated Flexor Digitorum Longus (FDL) muscle tear is extremely rare and so far, a handful of cases have been reported in the literature. Proper diagnosis and treatment will reduce the complications caused by this tear and helps to reduce the burden of the injury to the athlete and team.

A 38-year-old professional athletics male, presented with medial tibial pain that started while running. He did not have any history of diabetes, infectious and inflammatory joint diseases, and the use of drugs such as fluoroquinolone and corticosteroids and supplements containing it, statins, and other drugs that damaged the tendons was not reported. He presented with right leg claudication, despite normal lower limb alignment. Ultrasonography revealed evidence of a grade 3 strain of the FDL muscle with extensive hematoma. MRI confirmed the diagnosis of a grade 3 FDL strain. Treatment included hematoma aspiration, injection of Platelet rich plasma (PRP) in the train side under ultrasound guidance, physiotherapy and specific rehabilitation protocol. The patient adhered to the rehabilitation program and reported significant improvement in pain and function.

So far, only a few case reports have reported the rupture of this muscle spontaneously or after ankle dislocation or malleolus and talus fracture. The treatment was effective based on the patient’s response. Careful attention should be given to similar cases to ensure accurate diagnosis and appropriate treatment.

The collection and storage of platelets is associated with several challenges, to prevent the activation of platelets on the one hand and maintain their functional capacity during blood transfusion on the other hand. Today, one of the problems of platelet concentrate is the existence of platelet aggregations. The suspended particles in the platelet concentrate are believed to contain platelets that accumulate during the preparation and separation. The purpose of this study was to review important variables in the formation of platelet aggregations.

In this review article, 47 articles about aggregates in platelet products were studied from the PubMed database with platelet concentrate and platelet aggregate keywords.

In the reviewed studies, the accumulation of platelets in the platelet concentrates prepared by the Platelet-rich plasma (PRP) method was higher than in the buffy coat and apheresis methods. Various factors such as storage temperature, time and temperature of platelet rest, pH, induced physical stimulation, type of platelet bag, presence of bacteria, and variables related to the donor were considered as factors involved in the formation of platelet aggregation.

Conclusions  :

It is necessary to know the important variables in the formation of platelet aggregations to improve the platelet product's quality and increase the platelet transfusion's effectiveness. Using the Buffy coat method, standardizing time and temperature, preventing bacterial contamination, and considering the variables related to the donor are some of the proposed solutions to reduce the possibility of platelet aggregation.

Alginate is a natural polysaccharide that can cross-link with calcium ions and form a gel. Platelet-rich plasma, as a source of growth factors, has opened new horizons for use in regenerative medicine and regeneration of damaged tissues. The aim of this study was to synthesize calcium alginate hydrogel loaded with platelet-rich plasma and examine its morphology with a field emission scanning electron microscope (FESEM).  

5 Wistar rats (200-300 g) were used in this study. The animals were anesthetized and their blood was collected via cardiac puncture and centrifuged twice to obtain platelet-rich plasma (PRP). PRP and 6% calcium chloride solution were poured into 1% alginate solution (within a mechanical stirrer) separately using an insulin syringe needle, drop by drop at the same time. After gelation and freeze-drying, its morphology was examined by field emission scanning electron microscope.

In microscopic examination, the platelets of platelet-rich plasma trapped inside the calcium alginate hydrogel were visible as platelet aggregation.

The results of the present study showed the ability of calcium alginate hydrogel loaded with platelet-rich plasma as a suitable substrate for the storage and transfer of platelets rich in growth factors for the repair and regeneration of damaged tissues.

Polycystic ovary syndrome (PCOS) is a multifaceted endocrine and infertility disorder characterized by symptoms such as insulin resistance, hyperandrogenism, anovulation, and ovarian cysts. This study aimed to examine the effect of intraovarian injection of platelet-rich plasma (PRP) on ovarian morphology and insulin resistance in a PCOS rat model.

In this experimental study, 20 Wistar rats were divided into four groups (N=5): control, sham, PCOS, and PCOS group treated with PRP. PCOS was induced using 1 mg/kg of letrozole dissolved in 0.5% carboxymethyl cellulose. The PRP group received 35 microliters of PRP injected directly into both ovaries. After 14 days of treatment, serum insulin levels, blood glucose, and the insulin resistance index (HOMA-IR) were measured. Ovarian tissue sections were also examined for histopathological changes and follicle count.

Intraovarian injection of PRP led to a significant decrease in serum insulin levels (P<0.01) and glucose levels (P<0.01) compared to the PCOS group. The PRP-treated groups exhibited a significant reduction in the insulin resistance index (HOMA-IR) (P<0.0001). Histological analysis demonstrated that a single dose of PRP improved the ovarian pathological condition, resulting in a significant increase in healthy follicles at all developmental stages and corpus luteum (P<0.0001), along with a significant decrease in cystic follicles (P<0.0001).

Intraovarian PRP injection may ameliorate PCOS symptoms, including ovarian morphology and insulin resistance. However, further studies are necessary to elucidate the underlying mechanisms of PRP's effectiveness.

Ulcerative colitis is a kind of inflammatory bowel disease that involves factors such as genetic predisposition, environmental factors, and disproportionate function of the mucosal immune system in response to intestinal microbial flora. Platelet-rich plasma (PRP) is a blood derivative that has anti-inflammatory and cell-regenerating properties. This study aimed to investigate the effects of PRP on the clinical and inflammatory manifestations in an experimental model of ulcerative colitis.

In this experiment, male BALB/c mice were segregated into four groups, each consisting of 10 mice: the healthy group (negative control), the colitis group without treatment (positive control), the colitis group receiving PRP, and colitis group receiving sulfasalazine. All animals, except for those in the negative control group, were subjected to colitis induction via intrarectal injection of 100 µl of 4% acetic acid. The treatment regimen commenced after the onset of UC symptoms. The mice were euthanasia after 15 days of the last injection, and the disease activity index, as well as the inflammatory factors, were assessed.

According to the results, the treatment groups showed a significant decrease in disease activity index, the severity of inflammation, the level of MPO, NO, and IL-1β, IL-6, and TNF-α cytokines expression and production, as well as inflammatory genes COX2 and iNOS expression, compared to the positive control group.

The results showed that PRP has favorable anti-inflammatory effects in ulcerative colitis and after additional evaluations, it can be used as an adjunctive treatment along with the drugs used in the treatment of ulcerative colitis patients.

Today, the issue of microbial resistance is considered as one of the most important challenges in the field of public health and the use of new biocompatible, safe and effective antimicrobial compounds is very important to solve this problem. Therefore, according to the antimicrobial properties of platelets, treatments based on platelet products can be used as complementary approaches along with antibiotics to treat microbial infections. In this review article, the properties and mechanism of the antimicrobial effect of platelets and platelet products along with some of the available evidence in this field have been briefly described.

The search process was done in Google scholar and PubMed databases using keywords “Platelets”, “Platelet-rich plasma” and “Anti-Infective Agents” without time restrictions. 107 relevant articles were selected and their findings regarding the properties and mechanism of the antimicrobial effect of platelets and platelet products were used.

Antimicrobial activities of platelet products are due to the presence of a large number of platelets and various types of bioactive molecules, high amounts of platelet microbicidal proteins, and using multiple mechanisms. On the other hand, biocompatibility, safety, high clinical efficacy and limited side effects are some of the advantages of using platelet products. However, standardization and optimization of their preparation protocols are also important challenges.

The use of platelet products together with antibiotics is a suitable option to treat various microbial infections.

 Premature Ovarian Failure (POF) is a disease that occurs before the age of 40 due to dysfunction of the ovaries. In these women، the production and secretion of estrogen hormone is not done properly. Such a situation causes irregular or interrupted periods، disturbances in the ovulation process and occurrence of menopausal symptoms. Premature ovarian failure makes it difficult for women to get pregnant، so more research in this field is necessary.

 The results showed that one of the recommended ways to repair and regenerate the failing ovarian tissue was the use of platelet-rich plasma (PRP). The positive effects of PRP were dependent on the high concentration of growth factors in the alpha granules of platelets. The results of this review article showed that the use of platelet-rich plasma in restoring ovarian function could be considered as a treatment method in these patients.

There are different ways to prepare platelets. Every one of these methods can have advantages and limitations for blood transfusion centers, donors, and patients. Knowledge of them is necessary for choosing the proper technique in blood transfusion centers. This article reviewed the methods of preparing platelets and compared them.

Studies related to the preparation of platelet components, the texts of articles, and review references were extracted. PubMed, Web of Science, Scopus, Magiran, SID, Google, and Google Scholar search engines were used for keywords such as blood component, platelet-rich plasma, platelet concentrate, buffy-coat method, platelet storage, buffy-coat pooled platelet, plateletpheresis, pathogen inactivation, Overnight storage, preparation concentrate, Leukofiltered platelets from May to June 2022.

Studies comparing platelet preparation methods have had different results. One of the advantages of Buffy–coat method may be less activation, as platelets are centrifuged against a cushion of RBCs rather than the plastic container during PRP-PC production. Some recent findings have shown that the quality and clinical effectiveness of the buffy-Coat technique is better than Platelets Rich plasma (PRP) and is equivalent to the apheresis method. However, sufficient evidence is not yet available. The limitations of platelet preparation by the apheresis method, including the cost, declining apheresis donor base, and the time-consuming process, have led to the tendency towards other techniques. However, in cases such as platelet refractoriness, it is necessary to prepare matched platelets using the apheresis method.

To improve the quality of platelets and optimize the treatment of thrombocytopenic patients, it seems that the preparation of leuko-reduced pooled platelets is a suitable option considering the challenges of the apheresis method. With the advancement of techniques such as pathogen reduction and platelete additive solutions it is attempted for longer life span and safety.

Gamma irradiation (GI) of platelet concentrates (PCs) is done to prevent the risk of Transfusion associated graft versus host disease (TA-GVHD). However, some of studies indicate a lower post-transfusion responses and aggravation of platelet storage lesion (PSL) after GI. In this study, the effect of GI on the platelet metabolic status in stored PRP-PCs was investigated.

in our experimental study, 10 PRP-PC were randomly obtained from Iranian Blood Transfusion Organization (IBTO). Then, two ABO- and D matched PRP-PC units were pooled and splited into two bags, one kept as control while other was gamma-irradiated with 30 Gray. Within 7-day storage, glucose concentration and LDH activity were measured by enzymo-colorimetric method. PLT count and pH were measured using a hematology whole blood analyzer and the pH meter, respectively. Swirling was evaluated by visual assessment. Statistical data were analyzed by Kruskal-Wallis test with Dunn’s multiple comparison test and Wilcoxon Mached-Pair test. P values of less than 0.05 were considered to be significant.

Swirling was maintained in both groups throughout the storage period. Platelet count significantly decreased on Days 5 and 7 of storage but there was no significant difference between irradiated and non-irradiated PCs. Glucose decreased whilst LDH activity increased during storage period. The increments of LDH activities were significant on Days 5 (P<.05) and 7 of storage (P<.01) in non-irradiated groups.

Conclusions  :

The quality of irradiated PCs is well maintained throughout the storage period, with minimal difference in metabolic parameters compared to non-irradiated PLTs.

Torsion of spermatic cord induces ischemic-reperfusion injury which leads to testicular dysfunction, apoptosis of germ cells, ROS generation and infertility. Platelet-rich plasma (PRP) is a rich source of growth factors and anti-inflammatory cytokines. In this study, the effects of PRP on spermatogenesis and sperm chromatin condensation after ischemia-reperfusion injury were evaluated.

Forty adult male mice were procured in the study. Control group, torsion/ detorsion group, negative control group: torsion/ detorsion surgery with intra testicular injection of culture medium, treatment group: torsion/ detorsion surgery with intra testicular injection of PRP. After one cycle of spermatogenesis, histomorphometric evaluation was performed by PAS staining and sperm chromatin condensation was assessed by aniline blue staining. Data was analyzed by using SPSS Statistics and ANOVA followed by Tukey test.

The mean number of spermatogenic cells, Sertoli, Leydig, Myoid, Johnson score and mean diameter and thickness of germinal epithelium were significantly decreased following ischemia-reperfusion injury. Mean thickness of seminiferous tubules basement membrane as well as sperm percentage with residual histone increased after ischemia-reperfusion injury (P <0.001). After PRP treatment, there was a significant improvement in the histological structure of the tubules, cell viability, and sperm chromatin condensation (P <0.001). While, a significant difference was observed in comparison with control group.

PRP can partially ameliorate the complications of ischemia-reperfusion injury through its growth factors and anti-inflammatory cytokines involved in angiogenesis and antioxidant activity.

Interventional studies about platelet rich plasma efficacy in the patients with Repeated Implantation Failure (RIF) are not sufficient, while RIF is one of the major limiting factors in treating infertile patients. Therefore, the current study was designed to evaluate whether autologous intrauterine platelet rich plasma (PRP) instillation improves endometrial thickness (ET) in RIF patients during in vitro fertilization-embryo transfer (IVF-ET).

In this interventional study, a total of 20 women were enrolled whose embryo transfer cycles were canceled due to lack of proper growth of the endometrium or repeated implantation failure. In the study subjects, PRP was administered intrauterinely, and ultrasound was performed again 72 hours after the injection and the thickness of the endometrium was checked with Doppler ultrasound. Data were analyzed using SPSS 18 software.

The mean ET was calculated 6.80 ± 1.46 mm on the 10th day of menstruation, but 72 hours after the first PRP infusion, the mean ET was 8.09 ± 2 mm. The mean differences of increasing ET was 1.28 ± 0.53 mm (P < 0.02). After 72 hour of infusion, endometrial vascularity was good in 9 patients (45%) and moderate in 11 patients (55%). Two weeks following IVF-ET, β-HCG test was positive in 9 patients (45%) and negative in 11 patients (55%).     

The use of autologous PRP significantly improved the ET and endometrial vascularity, and most importantly increased pregnancy rate and live birth rates in RIF patients.

Surgical removal of mandibular third molars results in pain, swelling and bony defects, the growth factors present in platelet-rich plasma (PRP) can accelerate the healing, thereby shortening the postoperative recovery period. This study aimed, effect of platelet-rich plasma (PRP) on soft tissue healing after mandibular third molar surgery.

In this semi-blinded clinical trial study,30 selected patients requiring surgical extraction of soft tissue impacted mandibular third molar  participated from cases referred to the Department of Surgery, Faculty of Dentistry, Isfahan Azad University 2017.Patients divided into both test and control groups. PRP was placed in the extracted socket of the test group, whereas the control group had no PRP. Arzhangian standard kit utilized for preparation of PRP. The outcome variables in this study were pain, swelling, inter incisal mouth opening, wound dehiscence, dry socket, bleeding, and tissue color. The collected data analyzed using statistical tests followed independent T-test, Mann-Whitney, and fisher (p value < 0.05).

 The mean postoperative pain score (Visual Analog Scale) lowered for the test group after several wound dehiscence on the third and seventh days after surgery which was statistically significant (p value < 0.001). Although the mean bleeding time on the third day after surgery decreased in the test group, this difference was not statistically significant (p value = 0.59). There were no statistically significant between both groups for the dry socket incidence on the seventh day and the mean of inter incisal mouth opening in the third and seventh days after surgery as well.

The usage of topical PRP has beneficial advantages on soft tissue healing after mandibular third molar surgery. Unlike the control group, The PRP group provided reduced pain and better soft tissue healing.

Platelet activation occurs for a variety of reasons from the moment of sampling to that of injection. Activation of the platelets leads to activation of mitochondria. They move toward the membrane, sprouting and shedding freely from it, leading to the release of pro inflammatory mediators and mtDNA. Therefore, mtDNA level is considered as one of the parameters of platelet activity. The aim of this study was to compare mtDNA levels during storage.

This experimental study was performed on 22 PRP products. We obtained consent of all donors referring to Iran Innovation Center of Iranian Blood Transfusion Organization. Samples were taken from the PRP bags on day 1, 3 and 5. Then, the fold change of mtDNA was assessed by Real time PCR. The results were analyzed by paired t-test and the P value of less than 0.05 was considered significant.

The rate of mtDNA decreased 0.8-fold on day 3 to 1, 0.6-fold on day 5 to 3, and 0 .49 on day 5 to 1. These changes were significant on days 5 to 1 (p= 0.003) and they were not significant on days 3 to 1 (p= 0.4). 

Conclusions  

The amount of mtDNA increased on the first day, and then decreased during the storage of  PRP products.

According to the results of some studies, peripheral blood mononuclear cells activated with human placental gonadotropin increase the success rate of pregnancy in infertile women. This study aimed to compare the effect of two treatment methods of peripheral blood mononuclear cells activated with human placental gonadotropin and platelet-rich plasma on the success rate of pregnancy after embryo transfer.

This randomized clinical trial was conducted on 40 females with repeated implantation failure who were candidates for in vitro fertilization (IVF) and referred to Fatemieh Hospital, Hamadan, Iran, in 2019. Subsequently, they were randomly assigned to two groups of A and B. Peripheral blood mononuclear cells activated with human placental gonadotropin were utilized in group A, and group B received platelet-rich plasma autologous blood before transfusion. The incidence of chemical and clinical pregnancies was measured in both groups. Moreover, the data were analyzed in Stata software (version 14), and a p-value less than 0.05 was considered statistically significant.

The mean ages and duration of the infertility of the females were 32.5 and 34.4 years (P=0.203), as well as 9.1 and 8.5 years (P=0.747) in groups A and B, respectively. Moreover, the mean numbers of the obtained ovum, embryos formed, and transferred embryos were 15.4±11.5 and 12.9±8.9 (P=0.439), 7.1±6.2 and 5.8±3.8 (P=0.427), as well as 2.3±0.7 and 2.3±0.6 (P=1.00) in groups A and B, respectively. Furthermore, the rates of chemical pregnancies were 15% and 25% (P=0.619), and clinical pregnancies were 15% and 20% (P=0.581) in groups A and B, respectively.

The administration of human placental gonadotropin-activated peripheral blood cells showed similar results on pregnancy outcome with platelet-rich plasma after an embryo transfer in females who were candidates for IVF with repeated implantation failure.

The most common cause of knee pain is knee osteoarthritis, many surgical and non-surgical treatments have been proposed but the preferred treatment remains unknown. One of the non-surgical treatments was PRP (plasma reach platate) injection in these patients. Various studies have shown the improvement of the effect of PRP injection with substances such as calcium gluconate, so the aim of this study was to evaluate the effectof PRP with and without calcium gluconate on the clinical results of intra-articular injection of this substance in patients with knee osteoarthritis.

This was a cohort study in which patients were divided into two groups: PRP injection and PRP injection with calcium gluconate. The results of the study were evaluated by KOOS questionnaire and pain by VAS. A significance level of 0.05 was considered.

Generally, during the study, the pain level in patients after receiving both treatments significantly decreased during the six-month period, while the pain in the case group significantly decreased. (P Value <0.05).

From the results of this study, it can be concluded that simultaneous injection of PRP and calcium gluconate can further improve the results of injection.

It has been shown that growth factors have a great role in improving wound healing processes. In addition, a relatively high proportion of endodontically treated teeth will require retrograde treatment in the future. Therefore, the aim of the present study was to evaluate the effect of platelet-rich plasma (PRP) on differentiation of osteoblasts and osteoclasts in the presence of a three-dimensional scaffold.

In this in vitro study, mesenchymal stem cells were isolated from the Wharton jelly of human fetal umbilical cord and assigned into osteoblasts and osteoclasts groups for the evaluation of differentiation. Each group was subdivided into two subgroups with and without PRP. All the samples were cultured on two PCL/HA (polycaprolacton/hydroxyapatite) polymer scaffold. To evaluate differentiation into osteoblasts, DMEM (Dulbecco’s Modified Eagle’s Medium) was used that contained 7‒10-mol dexamethasone, 10-mol glycerophosphate, and 50-mol ascorbic acid. In the osteoclast differentiation group, RANKL (receptor activator of nuclear factor Kappa-B ligand) and CSF (colony-stimulating factor) were used. In addition to differentiation agents, 10% PRP was added to the two subgroups containing PRP. After 10 days, differentiation into osteoblasts and osteoclasts was evaluated by assessing the expression of specific genes using real-time PCR. In the osteoblast differentiation group, expression of osteocalcin and osteotrix genes was evaluated and in the osteoclast differentiation group, expression of TRAP (tartrate-resistant acid phosphatase) was evaluated. Data were analyzed using one-way ANOVA, two-way ANOVA, and post hoc Tukey tests, using Graph Pad software program.

Evaluation of the expression of the TRAP gene did not reveal any significant differences between the study and control groups. There was a significant difference between the group with the osteoclastogenic factor alone and the group with osteoclastogenic factor and PRP (p=0.0324). There was a significant difference in osterix expression between the control group and the PRP-treated group (p=0.0050). There was a significant difference between the group with osteoblastogenic factor alone and the group with osteoblastogenic factor and PRP (p=0.00001). There was a significant difference in the expression of osteocalcin gene between the control and PRP-treated groups (p=0.0110); however, the differences between the osteoblastogenesis groups with and without PRP treatment were not significant (P=0.5191). The differences in the expression of TRAP, osterix, and osteocalcin genes between the control and PRP-treated groups were significant (p=0.006 and p=0.0001, respectively).

The results of the present study showed that PRP resulted in an increase in osteoblastic differentiation, with no significant increase in osteoclastic differentiation.

Platelet-rich plasma (PRP) is one of the most important derivatives of blood. Over the past several years, the use of PRP has focused on the medical treatment in conditions such as skin rejuvenation and chronic ulcer treatment and hair loss. Also, PRP has been transmitted to the peripheral environment of the hair follicle through several intradermal injections to treat hair loss. The objective of this clinical trial was the evaluation of the effect of Platelet-Rich Plasma (PRP) in treatment of patients with androgenic alopecia.

In this randomized clinical trial, 20 patients with androgenic alopecia referring to dermatology clinic of Sina Hospital in Tabriz were assigned into the study. Interfollicular injections of Platelet-Rich Plasma (PRP), 0.1 ml/cm2 were performed 2 times in each patient in selected areas of the scalp at intervals of 30 days. The clinical manifestations and dermoscopy were used to evaluate the patients with androgenic alopecia. Before the intervention, 1 month, 3 months after the intervention were followed up, respectively.

Twenty patients (16 males and 4 females) were examined. The mean age of the patients was 32.88 ± 1.3 and in range of 24 to 48 years. The results of this study showed a significant increase in the mean number of hair in treated areas in the third month compared with the beginning of the study. In the treated areas there was an average increase of 13.9 after first month and 33.6 hairs per cm2 after 3 months.

According to the results of this study, PRP has a positive effect on the treatment of patients with androgenic alopecia.