scholarly journals The Effects of High Molecular Weight Hyaluronic Acid Eye Drop Application in Environmental Dry Eye Stress Model Mice

2020 ◽  
Vol 21 (10) ◽  
pp. 3516 ◽  
Author(s):  
Takashi Kojima ◽  
Taeko Nagata ◽  
Haruka Kudo ◽  
Wolfgang G. K. Müller-Lierheim ◽  
Gysbert-Botho van Setten ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Hyaluronic Acid ◽  
High Molecular Weight ◽  
Dry Eye ◽  
Ophthalmic Solution ◽  
Low Molecular Weight ◽  
Eye Drops ◽  
Office Work ◽  
Lissamine Green ◽  
Inflammatory Effect

Hyaluronic acid (HA) ophthalmic solution is widely used in dry eye treatment worldwide. However, there are no reports comparing the dry eye treatment effects of high molecular weight HA with low molecular weight HA. Sixty eight-week-old C57BL/6 mice were assigned to the following 6 groups and exposed to environmental dry eye stress (EDES) that mimics office work environment: (1) 0.1% low molecular weight HA (LMWHA) eye drops, (2) 0.3% LMWHA eye drops, (3) 3% diquafosol sodium (DQ) eye drops, (4) 0.15% high molecular weight HA (HMWHA) eye drops, (5) no treatment with exposure to EDES (EDES+/Treatment−), and (6) no treatment without exposure to EDES (EDES−/Treatment−). After EDES, the HMWHA group had significantly longer break-up time (BUT) than the 0.1%, 0.3% LMWHA groups and the DQ group. After EDES, the HMWHA group had significantly lower lissamine green staining scores than the LMWHA and DQ groups. Subepithelial presumed dendritic cell density in the HMWHA group was significantly lower than the EDES+/Treatment− group. After EDES exposure, Conjunctival Muc5AC mRNA expression in the HMWHA group was significantly higher than the 0.1 and 0.3% LMWHA groups. Ophthalmic HMWHA solution may have a better dry eye treatment effect than LMWHA or DQ solution, owing to its anti-inflammatory effect.

scholarly journals Hyaluronic Acid as an Alternative to Autologous Human Serum Eye Drops: Initial Clinical Results with High-Molecular-Weight Hyaluronic Acid Eye Drops

2019 ◽  
Vol 10 (2) ◽  
pp. 244-255 ◽  
Author(s):  
Ria Beck ◽  
Oliver Stachs ◽  
Anita Koschmieder ◽  
Wolfgang G.K. Mueller-Lierheim ◽  
Sabine Peschel ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Hyaluronic Acid ◽  
High Molecular Weight ◽  
Dry Eye ◽  
Autologous Serum ◽  
Control Group ◽  
Eye Drops ◽  
Very High ◽  
Serum Eye Drops ◽  
Better Than

Introduction: Autologous serum eye drops (ASED) are used in the treatment of most severe stages of dry eye. Once introduced, it is currently considered impossible to return to other lubricating eye drops or other commercially available therapeutic regimen. Materials and Methods: In a randomized study, non-preserved high-molecular-weight hyaluronic acid eye drops were offered as an alternative to 11 patients using autologous serum treatment for at least 3 months. The control group (n = 5) continued their treatment with ASED. The verum group (n = 6) used very-high-molecular-weight hyaluronic eye drops (Comfort Shield®) instead of the ASED. Results: From four of initially six patients in the verum group that finished the study, 2 (50%) preferred to stay with the very-high-molecular-weight hyaluronic acid eye drops beyond the trial period, the other two returned to the earlier therapy with ASED. The control group continued their treatment as before and finished the study after 8 weeks. Conclusion: For the first time, artificial eye drops, i.e., high-molecular-weight hyaluronic acid eye drops, offered an acceptable alternative to ASED. Some patients perceived these drops as even better than the patient’s own serum. This is the first evidence that optimization of the molecular structure of hyaluronic acid can be used to create eye drops that are perceived to be better than other tested tear substitutes and even patients’ own serum. This offers a new treatment perspective for patients with very severe dry eye disease.

scholarly journals Efficacy of single high-molecular-weight versus triple low-molecular-weight hyaluronic acid intra-articular injection among knee osteoarthritis patients

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Mohammad Hasan Bahrami ◽  
Seyed Ahmad Raeissadat ◽  
Mohsen Cheraghi ◽  
Shahram Rahimi-Dehgolan ◽  
Adel Ebrahimpour
Keyword(s):  
Molecular Weight ◽  
Hyaluronic Acid ◽  
Knee Osteoarthritis ◽  
High Molecular Weight ◽  
Low Molecular Weight

scholarly journals Efficient Degradation of High-Molecular-Weight Hyaluronic Acid by a Combination of Ultrasound, Hydrogen Peroxide, and Copper Ion

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 617 ◽  
Author(s):  
Hongyue Chen ◽  
Jing Qin ◽  
Yi Hu
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Weight ◽  
Hyaluronic Acid ◽  
High Molecular Weight ◽  
Chemical Method ◽  
Copper Ion ◽  
Physical Method ◽  
Cd Spectroscopy ◽  
Low Molecular Weight ◽  
Physical And Chemical

Hyaluronic acid (HA) was depolymerized by a combination of ultrasound, hydrogen peroxide and copper ion. The structures of high-molecular-weight hyaluronic acid (HMW-HA) and low-molecular-weight hyaluronic acid (LMW-HA) were determined by Fourier transform infrared (FTIR) spectroscopy, circular dichroism (CD) spectroscopy, and UV-VIS absorption spectroscopy. The degradations of HMW-HA using a physical method, a chemical method, and a combination of physical and chemical method were compared. The results show that HA can be effectively degraded by a combinatorial method involving ultrasound, hydrogen peroxide, and copper ion. Under the degradation conditions of 50 mM H2O2, 5.0 μM CuCl2, 160 W, pH 4.0, and reaction at 50 °C for 30 min, the content of glucuronic acid was 36.56%, and the yield of LMW-HA was 81.71%. The FTIR, CD, and UV-VIS absorption spectra of HA did not change with the decrease in molecular weight, indicating that the structure of HA remained intact during the degradation.

scholarly journals Efficacy of single high-molecular-weight versus triple low-molecular-weight hyaluronic acid intra-articular injection among knee osteoarthritis patients

2019 ◽  
Author(s):  
Adel Ebrahimpour ◽  
Mohammad Hasan Bahrami ◽  
Seyed Ahmad Raeissadat ◽  
Mohsen Cheraghi ◽  
Shahram Rahimi-Dehgolan
Keyword(s):  
Molecular Weight ◽  
Hyaluronic Acid ◽  
Knee Osteoarthritis ◽  
High Molecular Weight ◽  
Outcome Measures ◽  
Functional Improvement ◽  
Low Molecular Weight ◽  
Significant Difference ◽  
And Function

Abstract Purpose To compare intra-articular (IA) knee injections of a cross-linked high-molecular-weight hyaluronic acid (HMW-HA) with a linear low-molecular weight HA (LMW-HA) in terms of pain and functional improvement among knee osteoarthritis (OA) patients.Methods In this single-blinded RCT, the patients were randomly divided into two groups for HA injections. The first group received an HMW-HA (Arthromac) injection, while the other received three weekly LMW-HA (Hyalgan) injections. Pain and function were assessed using the outcome measures including WOMAC, Lequesne and VAS indices, once prior to injection, as well as 2 and 6 months after injections.Results A total of 90 patients were included. There was no significant difference in baseline characteristics including age and sex between the two groups. Our analysis showed that total WOMAC, Lequesne and VAS mean scores remarkably improved at both follow-up time-points compared to the baseline measurements (p<0.001). There was no significant superiority between the two therapeutic protocols according to our outcome measures at any time-point of follow-up. The only except was about the improvement in WOMAC stiffness subscale that was significantly higher in LMW-HA group compared to HMW-HA (p=0.021). Moreover, no significant difference was observed in minor complications and injection-induced pain scores between the two groups.Conclusion This study proved that a single HMW-HA injection is as effective as multiple injections of LMW-HA counterparts in periods of 2 and 6 months follow-up.

scholarly journals Efficacy of single high-molecular-weight versus triple low-molecular-weight hyaluronic acid intra-articular injection among knee osteoarthritis patients

2020 ◽  
Author(s):  
Mohammad Hasan Bahrami ◽  
Seyed Ahmad Raeissadat ◽  
Mohsen Cheraghi ◽  
Shahram Rahimi-Dehgolan ◽  
Adel Ebrahimpour
Keyword(s):  
Molecular Weight ◽  
Hyaluronic Acid ◽  
Knee Osteoarthritis ◽  
High Molecular Weight ◽  
Outcome Measures ◽  
Functional Improvement ◽  
Low Molecular Weight ◽  
Significant Difference ◽  
And Function

Abstract Purpose To compare intra-articular (IA) knee injections of a cross-linked high-molecular-weight hyaluronic acid (HMW-HA) with a linear low-molecular weight HA (LMW-HA) in terms of pain and functional improvement among knee osteoarthritis (OA) patients. Methods In this single-blinded RCT, the patients were randomly divided into two groups for HA injections. The first group received an HMW-HA (Arthromac) injection, while the other received three weekly LMW-HA (Hyalgan) injections. Pain and function were assessed using the outcome measures including WOMAC, Lequesne and VAS indices, once prior to injection, as well as 2 and 6 months after injections. Results A total of 90 patients were included. There was no significant difference in baseline characteristics including age and sex between the two groups. Our analysis showed that total WOMAC, Lequesne and VAS mean scores remarkably improved at both follow-up time-points compared to the baseline measurements (p<0.001). There was no significant superiority between the two therapeutic protocols according to our outcome measures at any time-point of follow-up. The only except was about the improvement in WOMAC stiffness subscale that was significantly higher in LMW-HA group compared to HMW-HA (p=0.021). Moreover, no significant difference was observed in minor complications and injection-induced pain scores between the two groups. Conclusion This study proved that a single HMW-HA injection is as effective as multiple injections of LMW-HA counterparts in periods of 2 and 6 months follow-up.

scholarly journals The HYLAN M Study: Efficacy of 0.15% High Molecular Weight Hyaluronan Fluid in the Treatment of Severe Dry Eye Disease in a Multicenter Randomized Trial

2020 ◽  
Vol 9 (11) ◽  
pp. 3536 ◽  
Author(s):  
Gysbert-Botho van Setten ◽  
Christophe Baudouin ◽  
Jutta Horwath-Winter ◽  
Daniel Böhringer ◽  
Oliver Stachs ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Dry Eye ◽  
Tear Film ◽  
Dry Eye Disease ◽  
Eye Disease ◽  
Control Group ◽  
Eye Drops ◽  
Artificial Tears ◽  
Ocular Surface Disease Index

The aim of the HYLAN M study was to investigate if symptoms and/or signs of patients suffering from severe dry eye disease (DED) can be improved by substituting individually optimized artificial tear therapy by high molecular weight hyaluronan (HMWHA) eye drops. In this international, multicenter study, patients with symptoms of at least ocular surface disease index (OSDI) 33 and corneal fluorescein staining (CFS) of at least Oxford grade 3 were included. A total of 84 per-protocol patients were randomized in two study arms. The control group continued to use their individual optimum artificial tears over the study period of eight weeks; in the verum group, the artificial tears were substituted by eye drops containing 0.15% HMWHA. At the week 8 visit, the average OSDI of the verum group had improved by 13.5 as compared to the control group (p = 0.001). The best corrected visual acuity (BCVA) had improved by 0.04 logMAR (p = 0.033). CFS, tear film break-up time (TBUT), Schirmer I, lid wiper epitheliopathy (LWE), mucocutaneous junction (Yamaguchi score), and tear osmolarity were not significantly different between the verum and control groups (p > 0.050). We conclude that for most patients with severe DED, 0.15% HMWHA eye drops provide excellent improvement of symptoms without impairment of dry eye signs.

scholarly journals Synthesis of hyaluronic acid hydrogels by crosslinking the mixture of high-molecular-weight hyaluronic acid and low-molecular-weight hyaluronic acid with 1,4-butanediol diglycidyl ether

RSC Advances ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 7206-7213 ◽  
Author(s):  
Yu Xue ◽  
Hongyue Chen ◽  
Chao Xu ◽  
Dinghua Yu ◽  
Huajin Xu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Hyaluronic Acid ◽  
High Molecular Weight ◽  
Diglycidyl Ether ◽  
Low Molecular Weight

High molecular weight hyaluronic acid (HMW-HA) and low molecular weight hyaluronic acid (LMW-HA) were mixed at different ratios and cross-linked with 1,4-butanediol diglycidyl ether (BDDE) to prepare five hyaluronic acid hydrogels A–E.

scholarly journals Efficacy of single high-molecular-weight versus triple low-molecular-weight hyaluronic acid intra-articular injection among knee osteoarthritis patients

2020 ◽  
Author(s):  
Adel Ebrahimpour ◽  
Mohammad Hasan Bahrami ◽  
Seyed Ahmad Raeissadat ◽  
Mohsen Cheraghi ◽  
Shahram Rahimi-Dehgolan
Keyword(s):  
Molecular Weight ◽  
Hyaluronic Acid ◽  
Knee Osteoarthritis ◽  
High Molecular Weight ◽  
Outcome Measures ◽  
Functional Improvement ◽  
Low Molecular Weight ◽  
Significant Difference ◽  
And Function

Abstract Background: To compare intra-articular (IA) knee injections of a cross-linked high-molecular-weight hyaluronic acid (HMW-HA) with a linear low-molecular weight HA (LMW-HA) in terms of pain and functional improvement among knee osteoarthritis (OA) patients.Methods: In this single-blinded RCT, the patients were randomly divided into two groups for HA injections. The first group received an HMW-HA (Arthromac) injection, while the other received three weekly LMW-HA (Hyalgan) injections. Pain and function were assessed using the outcome measures including WOMAC, Lequesne and VAS indices, once prior to injection, as well as 2 and 6 months after injections.Results: A total of 90 patients were included. There was no significant difference in baseline characteristics including age and sex between the two groups. Our analysis showed that total WOMAC, Lequesne and VAS mean scores remarkably improved at both follow-up time-points compared to the baseline measurements (p<0.001). There was no significant superiority between the two therapeutic protocols according to our outcome measures at any time-point of follow-up. The only except was about the improvement in WOMAC stiffness subscale that was significantly higher in LMW-HA group compared to HMW-HA (p=0.021). Moreover, no significant difference was observed in minor complications and injection-induced pain scores between the two groups.Conclusion: This study proved that a single HMW-HA injection is as effective as multiple injections of LMW-HA counterparts in periods of 2 and 6 months follow-up.This study protocol was registered in Iranian database of RCTs (IRCT; www.irct.ir) with the trial registration number IRCT20130523013442N24 and registration date 2018-07-13.

The Effect of Dextran of Various Molecular Weight on the Coagulation in Dogs

1961 ◽  
Vol 06 (01) ◽  
pp. 015-024 ◽  
Author(s):  
Sven Erik Bergentz ◽  
Oddvar Eiken ◽  
Inga Marie Nilsson
Keyword(s):  
Molecular Weight ◽  
Body Weight ◽  
High Molecular Weight ◽  
Bleeding Time ◽  
Factor Vii ◽  
Low Molecular Weight ◽  
Factor V ◽  
Coagulation Mechanism ◽  
Coagulation Defects

Summary1. Infusions of low molecular weight dextran (Mw = 42 000) to dogs in doses of 1—1.5 g per kg body weight did not produce any significant changes in the coagulation mechanism.2. Infusions of high molecular weight dextran (Mw = 1 000 000) to dogs in doses of 1—1.5 g per kg body weight produced severe defects in the coagulation mechanism, namely prolongation of bleeding time and coagulation time, thrombocytopenia, pathological prothrombin consumption, decrease of fibrinogen, prothrombin and factor VII, factor V and AHG.3. Heparin treatment of the dogs was found to prevent the decrease of fibrinogen, prothrombin and factor VII, and factor V otherwise occurring after injection of high molecular weight dextran. Thrombocytopenia was not prevented.4. In in vitro experiments an interaction between fibrinogen and dextran of high and low molecular weight was found to take place in systems comprising pure fibrinogen. No such interaction occurred in the presence of plasma.5. It is concluded that the coagulation defects induced by infusions of high molecular weight dextran are due to intravascular coagulation.

Sign in / Sign up

Export Citation Format

Share Document