Mechanisms of Ferroptosis in bone disease: A new target for osteoporosis treatment.

Osteoporosis (OP) is a common disease in the elderly, characterized by decreased bone strength, reduced bone density, and increased fracture risk. There are two clinical types of osteoporosis: primary osteoporosis and secondary osteoporosis. The most common form is postmenopausal osteoporosis, which is caused by decreased estrogen production after menopause. Secondary osteoporosis, on the other hand, occurs when certain medications, diabetes, or nutritional deficiencies lead to a decrease in bone density. Ferroptosis, a new iron-dependent programmed cell death process, is critical in regulating the development of osteoporosis, but the underlying molecular mechanisms are complex. In the pathologic process of osteoporosis, several studies have found that ferroptosis may occur in osteocytes, osteoblasts, and osteoclasts, cell types closely related to bone metabolism. The imbalance of iron homeostasis in osteoblasts and excessive iron accumulation can promote lipid peroxidation through the Fenton reaction, which induces ferroptosis in osteoblasts and affects their role in regulating bone metabolism. Ferroptosis in osteoblasts inhibits bone formation and reduces the amount of new bone production. Osteoclast-associated ferroptosis abnormalities, on the other hand, may alter the homeostasis of bone resorption. In this paper, we start from the molecular mechanism of ferroptosis, and introduce the ways in which ferroptosis affects the physiological and pathological processes of the body. After that, the effects of ferroptosis on osteoblasts and osteoclasts will be discussed separately to elucidate the molecular mechanism between ferroptosis and osteoporosis, which will provide a new breakthrough for the prevention and treatment of osteoporosis and a more effective and better idea for the treatment strategy of osteoporosis.