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In vitro and in vivo evaluation of novel Tadalafil/β-TCP/Collagen scaffold for bone regeneration: A rabbit critical-size calvarial defect study

Soufdoost Reza Sayyad, Yazdanian Mohsen, Tahmasebi Elaheh, Yazdanian Alireza, Tebyanian Hamid, Karami Ali, Nourani Mohammad Reza, Panahi Yunes

Biocybernetics and Biomedical Engineering

2019

Vol. 39, no. 3

789--796

Different composite materials have been investigated in bone regeneration but none of them have a significant regeneration in a short time. In this study, the novel scaffold with the osteoinductive characteristic in order to accelerate bone regeneration for 6 weeks. Tadalafil/β-TCP/Collagen (TβC) and β-TCP/Collagen (βC) composite scaffolds were prepared and analyzed by porosity, biodegradability and MTT tests. And then, three bone defects (8 mm diameter, n = 6 group) were produced and filled with TβC, βC scaffolds and the third defect was unfilled as a control. Samples were taken and evaluated by histological, radiological and histomorphometric evaluation at 4 and 6 weeks. In vitro tests showed that both scaffold approximately had the same results in the percentage of porosity and in vitro cytotoxicity. Biodegradability of the βC scaffold was more than TβC scaffold. In vivo test showed bone regeneration was more in TβC scaffold at 6 weeks based on radiological and histopathologic analysis compared with βC scaffold and control groups. Histomorphometric analysis showed that the amount of the bone regeneration was significant in TβC group in comparison βC and control groups (P < 0.05) at 6 weeks. This study highlights the promising application of TβC scaffold with Tadalafil for successful bone regeneration by enhancing osteogenesis.

Zmiany w obrazie termograficznym królika domowego (Oryctolagus cuniculus) w zależności od wieku i stanu fizjologicznego

Łapiński S., Augustyn J., Lis M., Kanik W., Niedbała P.

Pomiary Automatyka Kontrola

2011

R. 57, nr 10

1154-1156

Celem badań była ocena różnic w emisji ciepła spowodowanych wiekiem i stanem fizjologicznym królików, przy pomocy metody termowizyjnej. Na podstawie wykonanych pomiarów stwierdzono, iż właściwości ciepłochronne futra królików ulegają zmianie zależnie od wieku i stanu fizjologicznego. Obszarem najsilniej emitującym ciepło są okolice płciowe, których temperatura jest najwyższa u samic mających objawy rui a najniższa u samców i samic ciężarnych. Uszy królików pełnią funkcję termoregulacyjną, a ich temperatura wykazuje znaczną zmienność osobniczą.

The aim of the study was to evaluate the differences in heat emission due to age and physiological state of rabbits. The study was conducted in the spring-summer season for 36 adults and 30 young New Zealand White rabbits. Distribution of the surface temperature of animals was recorded using a Flir System Thermovision A20 camera. The study indicates that the thermographic camera is a useful tool in assessing the rabbit fur quality. At a constant external temperature (19 °C) the genital area is about 1.5 °C cooler than the rabbit body temperature (38,5-40,5 °C), while the surface temperature of the body varies depending on a gender and technological group (p ≤ 0.05) (Tab. 1, Figs. 2 and 3). During pregnancy and lactation the female body is exposed to a greater burden than the male body, which affects directly the density and quality of the fur coat [1]. The genital area was characterized by the highest temperature from among all studied areas. Depending on the physiological state of rabbits it had a different temperature (p ≤ 0.05). This is a consequence of the fact that rabbits are polioestrus animals, ready to get pregnant almost throughout the year. One of the signs that does are sexually receptive is better blood circulation and redness of the vulva [2]. This explains the vulva lower temperature of the pregnant does and higher of lactating does, ready to mating almost immediately after birth. In young animals it was found that the surface temperature of ears was increased in subsequent weeks of life (p ≤ 0.001, Fig. 4, Tab. 2), while the surface temperature of the body decreased (p ≤ 0.001, Figs. 4, 5 and 6, Tab. 2).

Najczęstsze przyczyny upadków królików

Potępka W.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2009

z. 93

81--82

Virus diseases cause among rabbits large mortality. Rabbits rcspond to various factors by an intestinal disturbance. It occours generally more often in young weaned rabbits. More easily is prevent diseases, than to cure thcy.